diff --git a/lib/ast-converter.js b/lib/ast-converter.js
index f0ded24..0656150 100644
--- a/lib/ast-converter.js
+++ b/lib/ast-converter.js
@@ -105,6 +105,17 @@ function isESTreeClassMember(node) {
     return node.kind !== SyntaxKind.SemicolonClassElement;
 }
 
+/**
+ * Returns true if the given node is an async function
+ * @param  {TSNode}  node TypeScript AST node
+ * @returns {boolean}     is an async function
+ */
+function isAsyncFunction(node) {
+    return !!node.modifiers && !!node.modifiers.length && node.modifiers.some(function(modifier) {
+        return modifier.kind === SyntaxKind.AsyncKeyword;
+    });
+}
+
 /**
  * Returns true if the given TSToken is a comma
  * @param  {TSToken}  token the TypeScript token
@@ -852,6 +863,7 @@ module.exports = function(ast, extra) {
                     id: convertChild(node.name),
                     generator: !!node.asteriskToken,
                     expression: false,
+                    async: isAsyncFunction(node),
                     params: node.parameters.map(convertChild),
                     body: convertChild(node.body)
                 });
@@ -1057,6 +1069,7 @@ module.exports = function(ast, extra) {
                         id: null,
                         generator: false,
                         expression: false,
+                        async: isAsyncFunction(node),
                         body: convertChild(node.body),
                         range: [ node.name.end, result.range[1]],
                         loc: {
@@ -1158,6 +1171,7 @@ module.exports = function(ast, extra) {
                         }),
                         generator: false,
                         expression: false,
+                        async: false,
                         body: convertChild(node.body),
                         range: [ result.range[0] + constructorStartOffset, result.range[1]],
                         loc: {
@@ -1226,6 +1240,7 @@ module.exports = function(ast, extra) {
                     generator: !!node.asteriskToken,
                     params: node.parameters.map(convertChild),
                     body: convertChild(node.body),
+                    async: isAsyncFunction(node),
                     expression: false
                 });
                 // Process returnType
@@ -1308,6 +1323,7 @@ module.exports = function(ast, extra) {
                     id: null,
                     params: node.parameters.map(convertChild),
                     body: convertChild(node.body),
+                    async: isAsyncFunction(node),
                     expression: node.body.kind !== SyntaxKind.Block
                 });
                 // Process returnType
@@ -1328,6 +1344,13 @@ module.exports = function(ast, extra) {
                 });
                 break;
 
+            case SyntaxKind.AwaitExpression:
+                assign(result, {
+                    type: "AwaitExpression",
+                    expression: convertChild(node.expression)
+                });
+                break;
+
             // Template Literals
 
             case SyntaxKind.NoSubstitutionTemplateLiteral:
diff --git a/lib/ast-node-types.js b/lib/ast-node-types.js
index 7832c22..3265712 100644
--- a/lib/ast-node-types.js
+++ b/lib/ast-node-types.js
@@ -23,6 +23,7 @@ module.exports = {
     ArrayExpression: "ArrayExpression",
     ArrayPattern: "ArrayPattern",
     ArrowFunctionExpression: "ArrowFunctionExpression",
+    AwaitExpression: "AwaitExpression",
     BlockStatement: "BlockStatement",
     BinaryExpression: "BinaryExpression",
     BreakStatement: "BreakStatement",
diff --git a/tests/fixtures/attach-comments/export-default-anonymous-class.result.js b/tests/fixtures/attach-comments/export-default-anonymous-class.result.js
index 3c28224..978a65a 100644
--- a/tests/fixtures/attach-comments/export-default-anonymous-class.result.js
+++ b/tests/fixtures/attach-comments/export-default-anonymous-class.result.js
@@ -56,6 +56,7 @@ module.exports = {
                                 },
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "range": [
                                     110,
                                     119
diff --git a/tests/fixtures/attach-comments/surrounding-call-comments.result.js b/tests/fixtures/attach-comments/surrounding-call-comments.result.js
index 4190fdb..fd5615f 100644
--- a/tests/fixtures/attach-comments/surrounding-call-comments.result.js
+++ b/tests/fixtures/attach-comments/surrounding-call-comments.result.js
@@ -123,6 +123,7 @@ module.exports = {
                 ]
             },
             "expression": false,
+            "async": false,
             "generator": false
         }
     ],
diff --git a/tests/fixtures/attach-comments/surrounding-debugger-comments.result.js b/tests/fixtures/attach-comments/surrounding-debugger-comments.result.js
index ac5d5bb..1e55dce 100644
--- a/tests/fixtures/attach-comments/surrounding-debugger-comments.result.js
+++ b/tests/fixtures/attach-comments/surrounding-debugger-comments.result.js
@@ -87,6 +87,7 @@ module.exports = {
                 ]
             },
             "expression": false,
+            "async": false,
             "generator": false
         }
     ],
diff --git a/tests/fixtures/attach-comments/surrounding-return-comments.result.js b/tests/fixtures/attach-comments/surrounding-return-comments.result.js
index 40693bc..aa103fe 100644
--- a/tests/fixtures/attach-comments/surrounding-return-comments.result.js
+++ b/tests/fixtures/attach-comments/surrounding-return-comments.result.js
@@ -88,6 +88,7 @@ module.exports = {
                 ]
             },
             "expression": false,
+            "async": false,
             "generator": false
         }
     ],
diff --git a/tests/fixtures/attach-comments/surrounding-throw-comments.result.js b/tests/fixtures/attach-comments/surrounding-throw-comments.result.js
index bdae3d1..bcb53e1 100644
--- a/tests/fixtures/attach-comments/surrounding-throw-comments.result.js
+++ b/tests/fixtures/attach-comments/surrounding-throw-comments.result.js
@@ -106,6 +106,7 @@ module.exports = {
                 ]
             },
             "expression": false,
+            "async": false,
             "generator": false
         }
     ],
diff --git a/tests/fixtures/attach-comments/surrounding-while-loop-comments.result.js b/tests/fixtures/attach-comments/surrounding-while-loop-comments.result.js
index 58d1342..ec4e87b 100644
--- a/tests/fixtures/attach-comments/surrounding-while-loop-comments.result.js
+++ b/tests/fixtures/attach-comments/surrounding-while-loop-comments.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [],
             "body": {
                 "type": "BlockStatement",
diff --git a/tests/fixtures/attach-comments/switch-fallthrough-comment-in-function.result.js b/tests/fixtures/attach-comments/switch-fallthrough-comment-in-function.result.js
index e11fe19..210b717 100644
--- a/tests/fixtures/attach-comments/switch-fallthrough-comment-in-function.result.js
+++ b/tests/fixtures/attach-comments/switch-fallthrough-comment-in-function.result.js
@@ -254,6 +254,7 @@ module.exports = {
                 ]
             },
             "expression": false,
+            "async": false,
             "generator": false
         }
     ],
diff --git a/tests/fixtures/attach-comments/switch-no-default-comment-in-function.result.js b/tests/fixtures/attach-comments/switch-no-default-comment-in-function.result.js
index c0903c2..473225d 100644
--- a/tests/fixtures/attach-comments/switch-no-default-comment-in-function.result.js
+++ b/tests/fixtures/attach-comments/switch-no-default-comment-in-function.result.js
@@ -238,6 +238,7 @@ module.exports = {
                 ]
             },
             "expression": false,
+            "async": false,
             "generator": false
         }
     ],
diff --git a/tests/fixtures/attach-comments/switch-no-default-comment-in-nested-functions.result.js b/tests/fixtures/attach-comments/switch-no-default-comment-in-nested-functions.result.js
index 48969fa..aa9dd9a 100644
--- a/tests/fixtures/attach-comments/switch-no-default-comment-in-nested-functions.result.js
+++ b/tests/fixtures/attach-comments/switch-no-default-comment-in-nested-functions.result.js
@@ -630,11 +630,13 @@ module.exports = {
                                     ]
                                 },
                                 "expression": false,
+                                "async": false,
                                 "generator": false
                             }
                         ]
                     },
                     "expression": false,
+                    "async": false,
                     "generator": false
                 }
             }
diff --git a/tests/fixtures/basics/new-without-parens.result.js b/tests/fixtures/basics/new-without-parens.result.js
index 1d7c82d..46b5482 100644
--- a/tests/fixtures/basics/new-without-parens.result.js
+++ b/tests/fixtures/basics/new-without-parens.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [],
             "body": {
                 "type": "BlockStatement",
diff --git a/tests/fixtures/basics/update-expression.result.js b/tests/fixtures/basics/update-expression.result.js
index a3f82e5..119a5fb 100644
--- a/tests/fixtures/basics/update-expression.result.js
+++ b/tests/fixtures/basics/update-expression.result.js
@@ -148,8 +148,9 @@ module.exports = {
                 ],
                 "type": "BlockStatement"
             },
-            "expression": false,
             "generator": false,
+            "expression": false,
+            "async": false,
             "id": {
                 "loc": {
                     "end": {
diff --git a/tests/fixtures/ecma-features-mix/classes-and-generators/classes-and-generators.result.js b/tests/fixtures/ecma-features-mix/classes-and-generators/classes-and-generators.result.js
index e453dde..c0a881f 100644
--- a/tests/fixtures/ecma-features-mix/classes-and-generators/classes-and-generators.result.js
+++ b/tests/fixtures/ecma-features-mix/classes-and-generators/classes-and-generators.result.js
@@ -70,6 +70,7 @@ module.exports = {
                             },
                             "generator": true,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 17,
                                 24
diff --git a/tests/fixtures/ecma-features-mix/classes-and-generators/computed-generator.result.js b/tests/fixtures/ecma-features-mix/classes-and-generators/computed-generator.result.js
index e06db8d..e8987ca 100644
--- a/tests/fixtures/ecma-features-mix/classes-and-generators/computed-generator.result.js
+++ b/tests/fixtures/ecma-features-mix/classes-and-generators/computed-generator.result.js
@@ -106,6 +106,7 @@ module.exports = {
                             },
                             "generator": true,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 31,
                                 38
diff --git a/tests/fixtures/ecma-features-mix/classes-and-generators/static-generators.result.js b/tests/fixtures/ecma-features-mix/classes-and-generators/static-generators.result.js
index 8b3008d..ea238e9 100644
--- a/tests/fixtures/ecma-features-mix/classes-and-generators/static-generators.result.js
+++ b/tests/fixtures/ecma-features-mix/classes-and-generators/static-generators.result.js
@@ -70,6 +70,7 @@ module.exports = {
                             },
                             "generator": true,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 24,
                                 31
diff --git a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param-arrow.result.js b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param-arrow.result.js
index b243043..dc6700e 100644
--- a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param-arrow.result.js
+++ b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param-arrow.result.js
@@ -88,6 +88,7 @@ module.exports = {
                             },
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 6,
                                 13
@@ -139,6 +140,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "range": [
                     0,
                     20
diff --git a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param.result.js b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param.result.js
index 87788d2..ffc3bd8 100644
--- a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param.result.js
+++ b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/default-param.result.js
@@ -118,6 +118,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     14
diff --git a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval-multi.result.js b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval-multi.result.js
index 95e0023..f976d18 100644
--- a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval-multi.result.js
+++ b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval-multi.result.js
@@ -101,6 +101,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     20
@@ -329,4 +330,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval.result.js b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval.result.js
index 03b1de5..8b79b30 100644
--- a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval.result.js
+++ b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/local-eval.result.js
@@ -83,6 +83,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     17
@@ -275,4 +276,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/yield-default-param.result.js b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/yield-default-param.result.js
index bf1cc87..be04943 100644
--- a/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/yield-default-param.result.js
+++ b/tests/fixtures/ecma-features-mix/defaultParams-and-arrowFunctions/yield-default-param.result.js
@@ -105,6 +105,7 @@ module.exports = {
                             },
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 16,
                                 33
@@ -153,6 +154,7 @@ module.exports = {
             },
             "generator": true,
             "expression": false,
+            "async": false,
             "range": [
                 0,
                 35
@@ -456,4 +458,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-array.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-array.result.js
index bb22241..4f67f92 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-array.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-array.result.js
@@ -65,6 +65,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     10
@@ -257,4 +258,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-array.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-array.result.js
index ffa6bf6..a100380 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-array.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-array.result.js
@@ -102,6 +102,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     15
@@ -366,4 +367,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object-named.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object-named.result.js
index b12cd6a..5d844af 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object-named.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object-named.result.js
@@ -219,6 +219,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     27
@@ -591,4 +592,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object.result.js
index 549b2f5..88daa07 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-nested-object.result.js
@@ -219,6 +219,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     17
@@ -519,4 +520,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-object.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-object.result.js
index e9bd579..c829883 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-object.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/arrow-param-object.result.js
@@ -104,6 +104,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     10
@@ -296,4 +297,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-array.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-array.result.js
index f82d268..e98e28d 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-array.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-array.result.js
@@ -101,6 +101,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     15
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object-nested.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object-nested.result.js
index 90dec70..413473a 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object-nested.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object-nested.result.js
@@ -328,6 +328,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     35
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object.result.js
index 4115ffa..7dc67fd 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-arrowFunctions/param-defaults-object.result.js
@@ -140,6 +140,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "range": [
                     0,
                     15
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-array.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-array.result.js
index c8c278a..ce25b86 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-array.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-array.result.js
@@ -135,6 +135,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "range": [
                 0,
                 24
@@ -437,4 +438,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-short.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-short.result.js
index 1a1299b..730eacb 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-short.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-short.result.js
@@ -221,6 +221,7 @@ module.exports = {
                             },
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 3,
                                 21
@@ -646,4 +647,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-wrapped.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-wrapped.result.js
index ee4ffed..2b7ccdb 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-wrapped.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object-wrapped.result.js
@@ -108,6 +108,7 @@ module.exports = {
                         rest: null,
                         generator: false,
                         expression: false,
+                        async: false,
                         range: [5, 31],
                         loc: {
                             start: { line: 1, column: 5 },
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object.result.js
index eff8073..6f3c7ef 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-defaultParams/param-object.result.js
@@ -219,6 +219,7 @@ module.exports = {
                     },
                     "generator": false,
                     "expression": false,
+                    "async": false,
                     "range": [
                         4,
                         30
@@ -588,4 +589,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/destructuring-and-spread/destructuring-param.result.js b/tests/fixtures/ecma-features-mix/destructuring-and-spread/destructuring-param.result.js
index 25c2999..4920e70 100644
--- a/tests/fixtures/ecma-features-mix/destructuring-and-spread/destructuring-param.result.js
+++ b/tests/fixtures/ecma-features-mix/destructuring-and-spread/destructuring-param.result.js
@@ -152,6 +152,7 @@ module.exports = {
       },
       "generator": false,
       "expression": false,
+      "async": false,
       "range": [
         0,
         30
diff --git a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-defaultParams/default-params.result.js b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-defaultParams/default-params.result.js
index 7796c83..d5346e2 100644
--- a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-defaultParams/default-params.result.js
+++ b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-defaultParams/default-params.result.js
@@ -162,6 +162,7 @@ module.exports = {
                                     },
                                     "generator": false,
                                     "expression": false,
+                                    "async": false,
                                     "range": [
                                         29,
                                         40
@@ -313,6 +314,7 @@ module.exports = {
                                     },
                                     "generator": false,
                                     "expression": false,
+                                    "async": false,
                                     "range": [
                                         46,
                                         60
@@ -482,6 +484,7 @@ module.exports = {
                                     },
                                     "generator": false,
                                     "expression": false,
+                                    "async": false,
                                     "range": [
                                         68,
                                         85
@@ -1302,4 +1305,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-destructuring/array-destructuring.result.js b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-destructuring/array-destructuring.result.js
index bfcd721..fb8ac43 100644
--- a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-destructuring/array-destructuring.result.js
+++ b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-destructuring/array-destructuring.result.js
@@ -106,6 +106,7 @@ module.exports = {
                             },
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "range": [
                                 4,
                                 16
@@ -459,4 +460,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-generators/generator-object-literal-method.result.js b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-generators/generator-object-literal-method.result.js
index a2685d8..6caea87 100644
--- a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-generators/generator-object-literal-method.result.js
+++ b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-generators/generator-object-literal-method.result.js
@@ -125,6 +125,7 @@ module.exports = {
                                     },
                                     "generator": true,
                                     "expression": false,
+                                    "async": false,
                                     "range": [
                                         16,
                                         31
diff --git a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-objectLiteralComputedProperties/computed-method-property.result.js b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-objectLiteralComputedProperties/computed-method-property.result.js
index 5ec21b4..bf0710d 100644
--- a/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-objectLiteralComputedProperties/computed-method-property.result.js
+++ b/tests/fixtures/ecma-features-mix/objectLiteralShorthandMethods-and-objectLiteralComputedProperties/computed-method-property.result.js
@@ -107,6 +107,7 @@ module.exports = {
                                     },
                                     "generator": false,
                                     "expression": false,
+                                    "async": false,
                                     "range": [
                                         19,
                                         49
@@ -495,4 +496,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest-multi.result.js b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest-multi.result.js
index 3371536..87c6526 100644
--- a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest-multi.result.js
+++ b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest-multi.result.js
@@ -81,6 +81,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "range": [
                     0,
                     15
@@ -309,4 +310,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest.result.js b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest.result.js
index a0a5281..2fbab66 100644
--- a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest.result.js
+++ b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/arrow-rest.result.js
@@ -63,6 +63,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "range": [
                     0,
                     12
@@ -255,4 +256,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-array.result.js b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-array.result.js
index 59a0351..056fe91 100644
--- a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-array.result.js
+++ b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-array.result.js
@@ -139,6 +139,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "range": [
                     0,
                     19
@@ -403,4 +404,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-multi.result.js b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-multi.result.js
index 355dc59..fbd27ec 100644
--- a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-multi.result.js
+++ b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-multi.result.js
@@ -251,6 +251,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "range": [
                     0,
                     33
@@ -695,4 +696,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-object.result.js b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-object.result.js
index 78d2d2b..7007fb9 100644
--- a/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-object.result.js
+++ b/tests/fixtures/ecma-features-mix/restParams-and-arrowFunctions/destructured-arrow-object.result.js
@@ -176,6 +176,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "range": [
                     0,
                     27
@@ -548,4 +549,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features-mix/templateStrings-and-jsx/template-strings-in-jsx-complex.result.js b/tests/fixtures/ecma-features-mix/templateStrings-and-jsx/template-strings-in-jsx-complex.result.js
index ea75734..8158d2f 100644
--- a/tests/fixtures/ecma-features-mix/templateStrings-and-jsx/template-strings-in-jsx-complex.result.js
+++ b/tests/fixtures/ecma-features-mix/templateStrings-and-jsx/template-strings-in-jsx-complex.result.js
@@ -931,6 +931,7 @@ module.exports = {
                                             },
                                             "generator": false,
                                             "expression": false,
+                                            "async": false,
                                             "range": [
                                                 86,
                                                 257
@@ -2522,4 +2523,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/as-param-with-params.result.js b/tests/fixtures/ecma-features/arrowFunctions/as-param-with-params.result.js
index 84bb130..347fc61 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/as-param-with-params.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/as-param-with-params.result.js
@@ -85,6 +85,7 @@ module.exports = {
                         "id": null,
                         "generator": false,
                         "expression": false,
+                        "async": false,
                         "params": [
                             {
                                 "type": "Identifier",
@@ -365,4 +366,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/as-param.result.js b/tests/fixtures/ecma-features/arrowFunctions/as-param.result.js
index 2221e20..d155574 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/as-param.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/as-param.result.js
@@ -85,6 +85,7 @@ module.exports = {
                         "id": null,
                         "generator": false,
                         "expression": false,
+                        "async": false,
                         "params": [],
                         "body": {
                             "type": "BlockStatement",
@@ -274,4 +275,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/basic.result.js b/tests/fixtures/ecma-features/arrowFunctions/basic.result.js
index 2ccbb76..70ee8b3 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/basic.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/basic.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "Literal",
@@ -166,4 +167,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/block-body-not-object.result.js b/tests/fixtures/ecma-features/arrowFunctions/block-body-not-object.result.js
index cdb1828..902c675 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/block-body-not-object.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/block-body-not-object.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -310,4 +311,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/block-body.result.js b/tests/fixtures/ecma-features/arrowFunctions/block-body.result.js
index ccbffc2..7848b1a 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/block-body.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/block-body.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -257,4 +258,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/expression.result.js b/tests/fixtures/ecma-features/arrowFunctions/expression.result.js
index 51eeaea..8014aab 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/expression.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/expression.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -202,4 +203,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/iife.result.js b/tests/fixtures/ecma-features/arrowFunctions/iife.result.js
index 4f81cb1..0cdd0ed 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/iife.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/iife.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -333,4 +334,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/multiple-params.result.js b/tests/fixtures/ecma-features/arrowFunctions/multiple-params.result.js
index 936fcec..788bb5d 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/multiple-params.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/multiple-params.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -257,4 +258,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/no-auto-return.result.js b/tests/fixtures/ecma-features/arrowFunctions/no-auto-return.result.js
index c0effed..e67c7e4 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/no-auto-return.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/no-auto-return.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -347,4 +348,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/not-strict-arguments.result.js b/tests/fixtures/ecma-features/arrowFunctions/not-strict-arguments.result.js
index 5672831..4e51fd3 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/not-strict-arguments.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/not-strict-arguments.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -167,4 +168,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval-params.result.js b/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval-params.result.js
index b094559..78deb4f 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval-params.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval-params.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -257,4 +258,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval.result.js b/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval.result.js
index 9c396d9..7060aea 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/not-strict-eval.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -167,4 +168,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/not-strict-octal.result.js b/tests/fixtures/ecma-features/arrowFunctions/not-strict-octal.result.js
index 335364d..3a8c648 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/not-strict-octal.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/not-strict-octal.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -203,4 +204,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/return-arrow-function.result.js b/tests/fixtures/ecma-features/arrowFunctions/return-arrow-function.result.js
index fc4798d..7353434 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/return-arrow-function.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/return-arrow-function.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -89,6 +90,7 @@ module.exports = {
                     "id": null,
                     "generator": false,
                     "expression": true,
+                    "async": false,
                     "params": [
                         {
                             "type": "Identifier",
@@ -243,4 +245,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/return-sequence.result.js b/tests/fixtures/ecma-features/arrowFunctions/return-sequence.result.js
index 48a3212..ff147bd 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/return-sequence.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/return-sequence.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -89,6 +90,7 @@ module.exports = {
                     "id": null,
                     "generator": false,
                     "expression": true,
+                    "async": false,
                     "params": [
                         {
                             "type": "Identifier",
@@ -567,4 +569,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/single-param-parens.result.js b/tests/fixtures/ecma-features/arrowFunctions/single-param-parens.result.js
index 888b7f3..2b3ebf0 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/single-param-parens.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/single-param-parens.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -203,4 +204,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/single-param-return-identifier.result.js b/tests/fixtures/ecma-features/arrowFunctions/single-param-return-identifier.result.js
index e8811ef..202b779 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/single-param-return-identifier.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/single-param-return-identifier.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -202,4 +203,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/arrowFunctions/single-param.result.js b/tests/fixtures/ecma-features/arrowFunctions/single-param.result.js
index a6964f0..390c795 100644
--- a/tests/fixtures/ecma-features/arrowFunctions/single-param.result.js
+++ b/tests/fixtures/ecma-features/arrowFunctions/single-param.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": true,
+                "async": false,
                 "params": [
                     {
                         "type": "Identifier",
@@ -167,4 +168,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-accessor-properties.result.js b/tests/fixtures/ecma-features/classes/class-accessor-properties.result.js
index 0a8e990..9e2247d 100644
--- a/tests/fixtures/ecma-features/classes/class-accessor-properties.result.js
+++ b/tests/fixtures/ecma-features/classes/class-accessor-properties.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -613,4 +615,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-computed-static-method.result.js b/tests/fixtures/ecma-features/classes/class-computed-static-method.result.js
index e99cd98..300d28a 100644
--- a/tests/fixtures/ecma-features/classes/class-computed-static-method.result.js
+++ b/tests/fixtures/ecma-features/classes/class-computed-static-method.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -424,4 +425,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-method-named-prototype.result.js b/tests/fixtures/ecma-features/classes/class-method-named-prototype.result.js
index 0587369..28b55ce 100644
--- a/tests/fixtures/ecma-features/classes/class-method-named-prototype.result.js
+++ b/tests/fixtures/ecma-features/classes/class-method-named-prototype.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -352,4 +353,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-method-named-static.result.js b/tests/fixtures/ecma-features/classes/class-method-named-static.result.js
index fe5b512..b0aa183 100644
--- a/tests/fixtures/ecma-features/classes/class-method-named-static.result.js
+++ b/tests/fixtures/ecma-features/classes/class-method-named-static.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -370,4 +371,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-one-method-super.result.js b/tests/fixtures/ecma-features/classes/class-one-method-super.result.js
index c785e39..19c9b6f 100644
--- a/tests/fixtures/ecma-features/classes/class-one-method-super.result.js
+++ b/tests/fixtures/ecma-features/classes/class-one-method-super.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -477,4 +478,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-one-method.result.js b/tests/fixtures/ecma-features/classes/class-one-method.result.js
index 2467802..92dd955 100644
--- a/tests/fixtures/ecma-features/classes/class-one-method.result.js
+++ b/tests/fixtures/ecma-features/classes/class-one-method.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -352,4 +353,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-static-method-named-prototype.result.js b/tests/fixtures/ecma-features/classes/class-static-method-named-prototype.result.js
index 09f4f07..71c48ae 100644
--- a/tests/fixtures/ecma-features/classes/class-static-method-named-prototype.result.js
+++ b/tests/fixtures/ecma-features/classes/class-static-method-named-prototype.result.js
@@ -92,6 +92,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -407,4 +408,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-static-method-named-static.result.js b/tests/fixtures/ecma-features/classes/class-static-method-named-static.result.js
index 23684f5..612ea03 100644
--- a/tests/fixtures/ecma-features/classes/class-static-method-named-static.result.js
+++ b/tests/fixtures/ecma-features/classes/class-static-method-named-static.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -388,4 +389,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-static-method.result.js b/tests/fixtures/ecma-features/classes/class-static-method.result.js
index cc8bd15..12ce22f 100644
--- a/tests/fixtures/ecma-features/classes/class-static-method.result.js
+++ b/tests/fixtures/ecma-features/classes/class-static-method.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -388,4 +389,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-static-methods-and-accessor-properties.result.js b/tests/fixtures/ecma-features/classes/class-static-methods-and-accessor-properties.result.js
index fb23622..28b4cff 100644
--- a/tests/fixtures/ecma-features/classes/class-static-methods-and-accessor-properties.result.js
+++ b/tests/fixtures/ecma-features/classes/class-static-methods-and-accessor-properties.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -249,6 +251,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -818,4 +821,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-computed-static-methods.result.js b/tests/fixtures/ecma-features/classes/class-two-computed-static-methods.result.js
index ef416cc..c3a0579 100644
--- a/tests/fixtures/ecma-features/classes/class-two-computed-static-methods.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-computed-static-methods.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -647,4 +649,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-methods-computed-constructor.result.js b/tests/fixtures/ecma-features/classes/class-two-methods-computed-constructor.result.js
index 2f2f517..498a863 100644
--- a/tests/fixtures/ecma-features/classes/class-two-methods-computed-constructor.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-methods-computed-constructor.result.js
@@ -92,6 +92,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -172,6 +173,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -559,4 +561,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-methods-semi.result.js b/tests/fixtures/ecma-features/classes/class-two-methods-semi.result.js
index 91a8ef9..a0ceb3a 100644
--- a/tests/fixtures/ecma-features/classes/class-two-methods-semi.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-methods-semi.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -539,4 +541,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-methods-three-semi.result.js b/tests/fixtures/ecma-features/classes/class-two-methods-three-semi.result.js
index 2093dba..3969128 100644
--- a/tests/fixtures/ecma-features/classes/class-two-methods-three-semi.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-methods-three-semi.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -575,4 +577,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-methods-two-semi.result.js b/tests/fixtures/ecma-features/classes/class-two-methods-two-semi.result.js
index 7a8ff70..c5209f8 100644
--- a/tests/fixtures/ecma-features/classes/class-two-methods-two-semi.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-methods-two-semi.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -557,4 +559,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-methods.result.js b/tests/fixtures/ecma-features/classes/class-two-methods.result.js
index d893630..a02df36 100644
--- a/tests/fixtures/ecma-features/classes/class-two-methods.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-methods.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -170,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -521,4 +523,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/classes/class-two-static-methods-named-constructor.result.js b/tests/fixtures/ecma-features/classes/class-two-static-methods-named-constructor.result.js
index 3fbfccd..e969325 100644
--- a/tests/fixtures/ecma-features/classes/class-two-static-methods-named-constructor.result.js
+++ b/tests/fixtures/ecma-features/classes/class-two-static-methods-named-constructor.result.js
@@ -126,6 +126,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
@@ -204,6 +205,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/classes/class-with-constructor.result.js b/tests/fixtures/ecma-features/classes/class-with-constructor.result.js
index e082cb6..42a2a8a 100644
--- a/tests/fixtures/ecma-features/classes/class-with-constructor.result.js
+++ b/tests/fixtures/ecma-features/classes/class-with-constructor.result.js
@@ -126,6 +126,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/defaultParams/declaration.result.js b/tests/fixtures/ecma-features/defaultParams/declaration.result.js
index 12c025f..fbd99e0 100644
--- a/tests/fixtures/ecma-features/defaultParams/declaration.result.js
+++ b/tests/fixtures/ecma-features/defaultParams/declaration.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "AssignmentPattern",
diff --git a/tests/fixtures/ecma-features/defaultParams/expression.result.js b/tests/fixtures/ecma-features/defaultParams/expression.result.js
index 9ca8637..f6ab67a 100644
--- a/tests/fixtures/ecma-features/defaultParams/expression.result.js
+++ b/tests/fixtures/ecma-features/defaultParams/expression.result.js
@@ -85,6 +85,7 @@ module.exports = {
                     "id": null,
                     "generator": false,
                     "expression": false,
+                    "async": false,
                     "params": [
                         {
                             "type": "AssignmentPattern",
diff --git a/tests/fixtures/ecma-features/defaultParams/method.result.js b/tests/fixtures/ecma-features/defaultParams/method.result.js
index 91261a8..c138b60 100644
--- a/tests/fixtures/ecma-features/defaultParams/method.result.js
+++ b/tests/fixtures/ecma-features/defaultParams/method.result.js
@@ -139,6 +139,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "params": [
                                     {
                                         "type": "AssignmentPattern",
diff --git a/tests/fixtures/ecma-features/defaultParams/not-all-params.result.js b/tests/fixtures/ecma-features/defaultParams/not-all-params.result.js
index 0c15e55..f7885b2 100644
--- a/tests/fixtures/ecma-features/defaultParams/not-all-params.result.js
+++ b/tests/fixtures/ecma-features/defaultParams/not-all-params.result.js
@@ -85,6 +85,7 @@ module.exports = {
                         "id": null,
                         "generator": false,
                         "expression": false,
+                        "async": false,
                         "params": [
                             {
                                 "type": "Identifier",
@@ -492,4 +493,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/destructured-array-catch.result.js b/tests/fixtures/ecma-features/destructuring/destructured-array-catch.result.js
index d77c2cc..5027265 100644
--- a/tests/fixtures/ecma-features/destructuring/destructured-array-catch.result.js
+++ b/tests/fixtures/ecma-features/destructuring/destructured-array-catch.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ObjectPattern",
@@ -914,4 +915,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/destructured-object-catch.result.js b/tests/fixtures/ecma-features/destructuring/destructured-object-catch.result.js
index 6d4aaa5..73a185e 100644
--- a/tests/fixtures/ecma-features/destructuring/destructured-object-catch.result.js
+++ b/tests/fixtures/ecma-features/destructuring/destructured-object-catch.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ObjectPattern",
@@ -953,4 +954,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/param-defaults-array.result.js b/tests/fixtures/ecma-features/destructuring/param-defaults-array.result.js
index 906c058..a5cb3a8 100644
--- a/tests/fixtures/ecma-features/destructuring/param-defaults-array.result.js
+++ b/tests/fixtures/ecma-features/destructuring/param-defaults-array.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ArrayPattern",
diff --git a/tests/fixtures/ecma-features/destructuring/param-defaults-object-nested.result.js b/tests/fixtures/ecma-features/destructuring/param-defaults-object-nested.result.js
index 6e81129..dd8a72d 100644
--- a/tests/fixtures/ecma-features/destructuring/param-defaults-object-nested.result.js
+++ b/tests/fixtures/ecma-features/destructuring/param-defaults-object-nested.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ObjectPattern",
@@ -716,4 +717,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/param-defaults-object.result.js b/tests/fixtures/ecma-features/destructuring/param-defaults-object.result.js
index 2b26445..73ade89 100644
--- a/tests/fixtures/ecma-features/destructuring/param-defaults-object.result.js
+++ b/tests/fixtures/ecma-features/destructuring/param-defaults-object.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ObjectPattern",
diff --git a/tests/fixtures/ecma-features/destructuring/params-array-wrapped.result.js b/tests/fixtures/ecma-features/destructuring/params-array-wrapped.result.js
index c4fda76..7af6c21 100644
--- a/tests/fixtures/ecma-features/destructuring/params-array-wrapped.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-array-wrapped.result.js
@@ -67,6 +67,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [
                     {
                         "type": "ArrayPattern",
@@ -400,4 +401,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/params-array.result.js b/tests/fixtures/ecma-features/destructuring/params-array.result.js
index e8c9028..442ff1a 100644
--- a/tests/fixtures/ecma-features/destructuring/params-array.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-array.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ArrayPattern",
@@ -364,4 +365,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/params-multi-object.result.js b/tests/fixtures/ecma-features/destructuring/params-multi-object.result.js
index b2a460d..bdccf34 100644
--- a/tests/fixtures/ecma-features/destructuring/params-multi-object.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-multi-object.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "Identifier",
@@ -403,4 +404,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/params-nested-array.result.js b/tests/fixtures/ecma-features/destructuring/params-nested-array.result.js
index 980e0c1..390ce67 100644
--- a/tests/fixtures/ecma-features/destructuring/params-nested-array.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-nested-array.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ArrayPattern",
@@ -457,4 +458,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/params-nested-object.result.js b/tests/fixtures/ecma-features/destructuring/params-nested-object.result.js
index c6f7786..c795570 100644
--- a/tests/fixtures/ecma-features/destructuring/params-nested-object.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-nested-object.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ObjectPattern",
@@ -644,4 +645,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/params-object-wrapped.result.js b/tests/fixtures/ecma-features/destructuring/params-object-wrapped.result.js
index fac97e3..54b73e8 100644
--- a/tests/fixtures/ecma-features/destructuring/params-object-wrapped.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-object-wrapped.result.js
@@ -67,6 +67,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [
                     {
                         "type": "ObjectPattern",
@@ -478,4 +479,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/destructuring/params-object.result.js b/tests/fixtures/ecma-features/destructuring/params-object.result.js
index 0acce76..4b14534 100644
--- a/tests/fixtures/ecma-features/destructuring/params-object.result.js
+++ b/tests/fixtures/ecma-features/destructuring/params-object.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "ObjectPattern",
@@ -442,4 +443,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/forOf/for-of-with-function-initializer.result.js b/tests/fixtures/ecma-features/forOf/for-of-with-function-initializer.result.js
index 344e65b..b82caac 100644
--- a/tests/fixtures/ecma-features/forOf/for-of-with-function-initializer.result.js
+++ b/tests/fixtures/ecma-features/forOf/for-of-with-function-initializer.result.js
@@ -101,6 +101,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
@@ -707,4 +708,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/anonymous-generator.result.js b/tests/fixtures/ecma-features/generators/anonymous-generator.result.js
index d08884d..c7963c6 100644
--- a/tests/fixtures/ecma-features/generators/anonymous-generator.result.js
+++ b/tests/fixtures/ecma-features/generators/anonymous-generator.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": true,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
@@ -327,4 +328,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/double-yield.result.js b/tests/fixtures/ecma-features/generators/double-yield.result.js
index 343c724..3bf284b 100644
--- a/tests/fixtures/ecma-features/generators/double-yield.result.js
+++ b/tests/fixtures/ecma-features/generators/double-yield.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": true,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
@@ -364,4 +365,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/empty-generator-declaration.result.js b/tests/fixtures/ecma-features/generators/empty-generator-declaration.result.js
index 7e864c5..e79bfbf 100644
--- a/tests/fixtures/ecma-features/generators/empty-generator-declaration.result.js
+++ b/tests/fixtures/ecma-features/generators/empty-generator-declaration.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": true,
             "expression": false,
+            "async": false,
             "params": [],
             "body": {
                 "type": "BlockStatement",
@@ -236,4 +237,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/generator-declaration.result.js b/tests/fixtures/ecma-features/generators/generator-declaration.result.js
index b3a22b0..7f0e5cf 100644
--- a/tests/fixtures/ecma-features/generators/generator-declaration.result.js
+++ b/tests/fixtures/ecma-features/generators/generator-declaration.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": true,
             "expression": false,
+            "async": false,
             "params": [],
             "body": {
                 "type": "BlockStatement",
@@ -344,4 +345,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/yield-delegation.result.js b/tests/fixtures/ecma-features/generators/yield-delegation.result.js
index d34a0d8..96c3687 100644
--- a/tests/fixtures/ecma-features/generators/yield-delegation.result.js
+++ b/tests/fixtures/ecma-features/generators/yield-delegation.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": true,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
@@ -345,4 +346,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/yield-without-value-in-call.result.js b/tests/fixtures/ecma-features/generators/yield-without-value-in-call.result.js
index b721c0e..9e7af39 100644
--- a/tests/fixtures/ecma-features/generators/yield-without-value-in-call.result.js
+++ b/tests/fixtures/ecma-features/generators/yield-without-value-in-call.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": true,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
@@ -401,4 +402,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/yield-without-value-no-semi.result.js b/tests/fixtures/ecma-features/generators/yield-without-value-no-semi.result.js
index fd58214..a367eec 100644
--- a/tests/fixtures/ecma-features/generators/yield-without-value-no-semi.result.js
+++ b/tests/fixtures/ecma-features/generators/yield-without-value-no-semi.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": true,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
@@ -292,4 +293,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/generators/yield-without-value.result.js b/tests/fixtures/ecma-features/generators/yield-without-value.result.js
index 96b2eb7..08032f3 100644
--- a/tests/fixtures/ecma-features/generators/yield-without-value.result.js
+++ b/tests/fixtures/ecma-features/generators/yield-without-value.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": true,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/modules/export-default-function.result.js b/tests/fixtures/ecma-features/modules/export-default-function.result.js
index 383afa4..4cd2c26 100644
--- a/tests/fixtures/ecma-features/modules/export-default-function.result.js
+++ b/tests/fixtures/ecma-features/modules/export-default-function.result.js
@@ -50,6 +50,7 @@ module.exports = {
                 "id": null,
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/modules/export-default-named-function.result.js b/tests/fixtures/ecma-features/modules/export-default-named-function.result.js
index 9fbc71a..8e5b362 100644
--- a/tests/fixtures/ecma-features/modules/export-default-named-function.result.js
+++ b/tests/fixtures/ecma-features/modules/export-default-named-function.result.js
@@ -67,6 +67,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/modules/export-function.result.js b/tests/fixtures/ecma-features/modules/export-function.result.js
index b594347..92e3721 100644
--- a/tests/fixtures/ecma-features/modules/export-function.result.js
+++ b/tests/fixtures/ecma-features/modules/export-function.result.js
@@ -67,6 +67,7 @@ module.exports = {
                 },
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                     "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/modules/export-var-anonymous-function.result.js b/tests/fixtures/ecma-features/modules/export-var-anonymous-function.result.js
index bfc762d..a29d309 100644
--- a/tests/fixtures/ecma-features/modules/export-var-anonymous-function.result.js
+++ b/tests/fixtures/ecma-features/modules/export-var-anonymous-function.result.js
@@ -101,6 +101,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
@@ -312,4 +313,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/newTarget/simple-new-target.result.js b/tests/fixtures/ecma-features/newTarget/simple-new-target.result.js
index 50b45bf..3c6ea66 100644
--- a/tests/fixtures/ecma-features/newTarget/simple-new-target.result.js
+++ b/tests/fixtures/ecma-features/newTarget/simple-new-target.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [],
             "body": {
                 "type": "BlockStatement",
diff --git a/tests/fixtures/ecma-features/objectLiteralComputedProperties/computed-getter-and-setter.result.js b/tests/fixtures/ecma-features/objectLiteralComputedProperties/computed-getter-and-setter.result.js
index fc46113..1d335d9 100644
--- a/tests/fixtures/ecma-features/objectLiteralComputedProperties/computed-getter-and-setter.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralComputedProperties/computed-getter-and-setter.result.js
@@ -105,6 +105,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
@@ -183,6 +184,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [
                                 {
                                     "type": "Identifier",
@@ -644,4 +646,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralComputedProperties/standalone-expression-with-method.result.js b/tests/fixtures/ecma-features/objectLiteralComputedProperties/standalone-expression-with-method.result.js
index 52937b5..fa34bcf 100644
--- a/tests/fixtures/ecma-features/objectLiteralComputedProperties/standalone-expression-with-method.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralComputedProperties/standalone-expression-with-method.result.js
@@ -104,6 +104,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [],
                             "body": {
                                 "type": "BlockStatement",
@@ -385,4 +386,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/method-property.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/method-property.result.js
index 2c0741f..467de21 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/method-property.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/method-property.result.js
@@ -140,6 +140,7 @@ module.exports = {
                                     "id": null,
                                     "generator": false,
                                     "expression": false,
+                                    "async": false,
                                     "params": [],
                                     "body": {
                                         "type": "BlockStatement",
@@ -459,4 +460,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-get.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-get.result.js
index a9a13bc..f5175f8 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-get.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-get.result.js
@@ -140,6 +140,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "params": [],
                                 "body": {
                                     "type": "BlockStatement",
@@ -384,4 +385,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-set.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-set.result.js
index c82cc70..996338a 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-set.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-named-set.result.js
@@ -140,6 +140,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "params": [],
                                 "body": {
                                     "type": "BlockStatement",
@@ -384,4 +385,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-argument.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-argument.result.js
index 66f0609..03e0de7 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-argument.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-argument.result.js
@@ -140,6 +140,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "params": [
                                     {
                                         "type": "Identifier",
@@ -421,4 +422,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-string-name.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-string-name.result.js
index 6f61046..7f6591f 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-string-name.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method-with-string-name.result.js
@@ -141,6 +141,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "params": [],
                                 "body": {
                                     "type": "BlockStatement",
@@ -385,4 +386,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method.result.js
index 05d14d6..b21677a 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/simple-method.result.js
@@ -140,6 +140,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "params": [],
                                 "body": {
                                     "type": "BlockStatement",
@@ -384,4 +385,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/string-name-method-property.result.js b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/string-name-method-property.result.js
index 4fdffc8..20df529 100644
--- a/tests/fixtures/ecma-features/objectLiteralShorthandMethods/string-name-method-property.result.js
+++ b/tests/fixtures/ecma-features/objectLiteralShorthandMethods/string-name-method-property.result.js
@@ -141,6 +141,7 @@ module.exports = {
                                     "id": null,
                                     "generator": false,
                                     "expression": false,
+                                    "async": false,
                                     "params": [],
                                     "body": {
                                         "type": "BlockStatement",
@@ -460,4 +461,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/restParams/basic-rest.result.js b/tests/fixtures/ecma-features/restParams/basic-rest.result.js
index 9f87227..144b074 100644
--- a/tests/fixtures/ecma-features/restParams/basic-rest.result.js
+++ b/tests/fixtures/ecma-features/restParams/basic-rest.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "Identifier",
@@ -344,4 +345,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/restParams/func-expression-multi.result.js b/tests/fixtures/ecma-features/restParams/func-expression-multi.result.js
index f56dcac..f3c1b50 100644
--- a/tests/fixtures/ecma-features/restParams/func-expression-multi.result.js
+++ b/tests/fixtures/ecma-features/restParams/func-expression-multi.result.js
@@ -85,6 +85,7 @@ module.exports = {
                         "id": null,
                         "generator": false,
                         "expression": false,
+                        "async": false,
                         "params": [
                             {
                                 "type": "Identifier",
@@ -401,4 +402,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/restParams/func-expression.result.js b/tests/fixtures/ecma-features/restParams/func-expression.result.js
index 3a8641e..0fe1159 100644
--- a/tests/fixtures/ecma-features/restParams/func-expression.result.js
+++ b/tests/fixtures/ecma-features/restParams/func-expression.result.js
@@ -85,6 +85,7 @@ module.exports = {
                         "id": null,
                         "generator": false,
                         "expression": false,
+                        "async": false,
                         "params": [
                             {
                                 "type": "RestElement",
@@ -347,4 +348,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/restParams/single-rest.result.js b/tests/fixtures/ecma-features/restParams/single-rest.result.js
index 3a79eb2..93bd3ca 100644
--- a/tests/fixtures/ecma-features/restParams/single-rest.result.js
+++ b/tests/fixtures/ecma-features/restParams/single-rest.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "RestElement",
@@ -290,4 +291,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/ecma-features/templateStrings/tagged-template-string.result.js b/tests/fixtures/ecma-features/templateStrings/tagged-template-string.result.js
index fc2d508..63037b1 100644
--- a/tests/fixtures/ecma-features/templateStrings/tagged-template-string.result.js
+++ b/tests/fixtures/ecma-features/templateStrings/tagged-template-string.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [],
             "body": {
                 "type": "BlockStatement",
@@ -719,4 +720,4 @@ module.exports = {
             ]
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/basics/abstract-class-with-abstract-method.result.js b/tests/fixtures/typescript/basics/abstract-class-with-abstract-method.result.js
index 082ed35..5d253fe 100644
--- a/tests/fixtures/typescript/basics/abstract-class-with-abstract-method.result.js
+++ b/tests/fixtures/typescript/basics/abstract-class-with-abstract-method.result.js
@@ -93,6 +93,7 @@ module.exports = {
                                 "id": null,
                                 "generator": false,
                                 "expression": false,
+                                "async": false,
                                 "body": null,
                                 "range": [
                                     64,
diff --git a/tests/fixtures/typescript/basics/arrow-function-with-type-parameters.result.js b/tests/fixtures/typescript/basics/arrow-function-with-type-parameters.result.js
index c481ca8..7b6c530 100644
--- a/tests/fixtures/typescript/basics/arrow-function-with-type-parameters.result.js
+++ b/tests/fixtures/typescript/basics/arrow-function-with-type-parameters.result.js
@@ -176,6 +176,7 @@ module.exports = {
                     ]
                 },
                 "expression": false,
+                "async": false,
                 "returnType": {
                     "type": "TypeAnnotation",
                     "loc": {
@@ -559,4 +560,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/basics/class-with-accessibility-modifiers.result.js b/tests/fixtures/typescript/basics/class-with-accessibility-modifiers.result.js
index b79e78f..ac8a778 100644
--- a/tests/fixtures/typescript/basics/class-with-accessibility-modifiers.result.js
+++ b/tests/fixtures/typescript/basics/class-with-accessibility-modifiers.result.js
@@ -171,6 +171,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -321,6 +322,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/basics/declare-function.result.js b/tests/fixtures/typescript/basics/declare-function.result.js
index 9add748..efe5741 100644
--- a/tests/fixtures/typescript/basics/declare-function.result.js
+++ b/tests/fixtures/typescript/basics/declare-function.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "Identifier",
diff --git a/tests/fixtures/typescript/basics/function-with-await.result.js b/tests/fixtures/typescript/basics/function-with-await.result.js
new file mode 100644
index 0000000..cc03d87
--- /dev/null
+++ b/tests/fixtures/typescript/basics/function-with-await.result.js
@@ -0,0 +1,349 @@
+module.exports = {
+    "type": "Program",
+    "body": [
+        {
+            "type": "FunctionDeclaration",
+            "expression": false,
+            "generator": false,
+            "async": true,
+            "id": {
+                "type": "Identifier",
+                "name": "hope",
+                "loc": {
+                    "end": {
+                        "column": 19,
+                        "line": 1
+                    },
+                    "start": {
+                        "column": 15,
+                        "line": 1
+                    }
+                },
+                "range": [
+                    15,
+                    19
+                ]
+            },
+            "params": [
+                {
+                    "loc": {
+                        "end": {
+                            "column": 26,
+                            "line": 1
+                        },
+                        "start": {
+                            "column": 20,
+                            "line": 1
+                        }
+                    },
+                    "name": "future",
+                    "range": [
+                        20,
+                        26
+                    ],
+                    "type": "Identifier"
+                }
+            ],
+            "body": {
+                "type": "BlockStatement",
+                "body": [
+                    {
+                        "type": "ExpressionStatement",
+                        "expression": {
+                            "type": "AwaitExpression",
+                            "expression": {
+                                "type": "Identifier",
+                                "loc": {
+                                    "end": {
+                                        "column": 16,
+                                        "line": 2
+                                    },
+                                    "start": {
+                                        "column": 10,
+                                        "line": 2
+                                    }
+                                },
+                                "name": "future",
+                                "range": [
+                                    40,
+                                    46
+                                ]
+                            },
+                            "loc": {
+                                "end": {
+                                    "column": 16,
+                                    "line": 2
+                                },
+                                "start": {
+                                    "column": 4,
+                                    "line": 2
+                                }
+                            },
+                            "range": [
+                                34,
+                                46
+                            ]
+                        },
+                        "loc": {
+                            "end": {
+                                "column": 17,
+                                "line": 2
+                            },
+                            "start": {
+                                "column": 4,
+                                "line": 2
+                            }
+                        },
+                        "range": [
+                            34,
+                            47
+                        ]
+                    }
+                ],
+                "loc": {
+                    "end": {
+                        "column": 1,
+                        "line": 3
+                    },
+                    "start": {
+                        "column": 28,
+                        "line": 1
+                    }
+                },
+                "range": [
+                    28,
+                    49
+                ]
+            },
+            "loc": {
+                "end": {
+                    "column": 1,
+                    "line": 3
+                },
+                "start": {
+                    "column": 0,
+                    "line": 1
+                }
+            },
+            "range": [
+                0,
+                49
+            ]
+        }
+    ],
+    "loc": {
+        "end": {
+            "column": 1,
+            "line": 3
+        },
+        "start": {
+            "column": 0,
+            "line": 1
+        }
+    },
+    "range": [
+        0,
+        49
+    ],
+    "sourceType": "script",
+    "tokens": [
+        {
+            "type": "Identifier",
+            "value": "async",
+            "loc": {
+                "end": {
+                    "column": 5,
+                    "line": 1
+                },
+                "start": {
+                    "column": 0,
+                    "line": 1
+                }
+            },
+            "range": [
+                0,
+                5
+            ]
+        },
+        {
+            "type": "Keyword",
+            "value": "function",
+            "loc": {
+                "end": {
+                    "column": 14,
+                    "line": 1
+                },
+                "start": {
+                    "column": 6,
+                    "line": 1
+                }
+            },
+            "range": [
+                6,
+                14
+            ]
+        },
+        {
+            "type": "Identifier",
+            "value": "hope",
+            "loc": {
+                "end": {
+                    "column": 19,
+                    "line": 1
+                },
+                "start": {
+                    "column": 15,
+                    "line": 1
+                }
+            },
+            "range": [
+                15,
+                19
+            ]
+        },
+        {
+            "type": "Punctuator",
+            "value": "(",
+            "loc": {
+                "end": {
+                    "column": 20,
+                    "line": 1
+                },
+                "start": {
+                    "column": 19,
+                    "line": 1
+                }
+            },
+            "range": [
+                19,
+                20
+            ]
+        },
+        {
+            "type": "Identifier",
+            "value": "future",
+            "loc": {
+                "end": {
+                    "column": 26,
+                    "line": 1
+                },
+                "start": {
+                    "column": 20,
+                    "line": 1
+                }
+            },
+            "range": [
+                20,
+                26
+            ]
+        },
+        {
+            "type": "Punctuator",
+            "value": ")",
+            "loc": {
+                "end": {
+                    "column": 27,
+                    "line": 1
+                },
+                "start": {
+                    "column": 26,
+                    "line": 1
+                }
+            },
+            "range": [
+                26,
+                27
+            ]
+        },
+        {
+            "type": "Punctuator",
+            "value": "{",
+            "loc": {
+                "end": {
+                    "column": 29,
+                    "line": 1
+                },
+                "start": {
+                    "column": 28,
+                    "line": 1
+                }
+            },
+            "range": [
+                28,
+                29
+            ]
+        },
+        {
+            "type": "Identifier",
+            "value": "await",
+            "loc": {
+                "end": {
+                    "column": 9,
+                    "line": 2
+                },
+                "start": {
+                    "column": 4,
+                    "line": 2
+                }
+            },
+            "range": [
+                34,
+                39
+            ]
+        },
+        {
+            "type": "Identifier",
+            "value": "future",
+            "loc": {
+                "end": {
+                    "column": 16,
+                    "line": 2
+                },
+                "start": {
+                    "column": 10,
+                    "line": 2
+                }
+            },
+            "range": [
+                40,
+                46
+            ]
+        },
+        {
+            "type": "Punctuator",
+            "value": ";",
+            "loc": {
+                "end": {
+                    "column": 17,
+                    "line": 2
+                },
+                "start": {
+                    "column": 16,
+                    "line": 2
+                }
+            },
+            "range": [
+                46,
+                47
+            ]
+        },
+        {
+            "type": "Punctuator",
+            "value": "}",
+            "loc": {
+                "end": {
+                    "column": 1,
+                    "line": 3
+                },
+                "start": {
+                    "column": 0,
+                    "line": 3
+                }
+            },
+            "range": [
+                48,
+                49
+            ]
+        }
+    ]
+};
diff --git a/tests/fixtures/typescript/basics/function-with-await.src.ts b/tests/fixtures/typescript/basics/function-with-await.src.ts
new file mode 100644
index 0000000..e867dc4
--- /dev/null
+++ b/tests/fixtures/typescript/basics/function-with-await.src.ts
@@ -0,0 +1,3 @@
+async function hope(future) {
+    await future;
+}
diff --git a/tests/fixtures/typescript/basics/function-with-type-parameters.result.js b/tests/fixtures/typescript/basics/function-with-type-parameters.result.js
index 30d7d28..79b15d2 100644
--- a/tests/fixtures/typescript/basics/function-with-type-parameters.result.js
+++ b/tests/fixtures/typescript/basics/function-with-type-parameters.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "Identifier",
diff --git a/tests/fixtures/typescript/basics/function-with-types.result.js b/tests/fixtures/typescript/basics/function-with-types.result.js
index ed35825..bccbe7b 100644
--- a/tests/fixtures/typescript/basics/function-with-types.result.js
+++ b/tests/fixtures/typescript/basics/function-with-types.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "Identifier",
diff --git a/tests/fixtures/typescript/basics/non-null-assertion-operator.result.js b/tests/fixtures/typescript/basics/non-null-assertion-operator.result.js
index fba26ae..9fa6cc7 100644
--- a/tests/fixtures/typescript/basics/non-null-assertion-operator.result.js
+++ b/tests/fixtures/typescript/basics/non-null-assertion-operator.result.js
@@ -51,6 +51,7 @@ module.exports = {
             },
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
                 {
                     "type": "Identifier",
diff --git a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-instance-member.result.js b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-instance-member.result.js
index 2e63f45..990e66d 100644
--- a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-instance-member.result.js
+++ b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-instance-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -643,4 +644,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-static-member.result.js b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-static-member.result.js
index 03b6881..6449044 100644
--- a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-static-member.result.js
+++ b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-static-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-instance-member.result.js b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-instance-member.result.js
index ee29e08..8f15e94 100644
--- a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-instance-member.result.js
+++ b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-instance-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -551,4 +552,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-static-member.result.js b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-static-member.result.js
index a1368f9..301e980 100644
--- a/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-static-member.result.js
+++ b/tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-static-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-instance-member.result.js b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-instance-member.result.js
index 50dac49..6bf94df 100644
--- a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-instance-member.result.js
+++ b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-instance-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -464,4 +465,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-static-member.result.js b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-static-member.result.js
index f43fb5f..00df8ea 100644
--- a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-static-member.result.js
+++ b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-factory-static-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-instance-member.result.js b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-instance-member.result.js
index d7b7884..1e5ad09 100644
--- a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-instance-member.result.js
+++ b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-instance-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -372,4 +373,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-static-member.result.js b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-static-member.result.js
index b710d11..9e52d52 100644
--- a/tests/fixtures/typescript/decorators/method-decorators/method-decorator-static-member.result.js
+++ b/tests/fixtures/typescript/decorators/method-decorators/method-decorator-static-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-constructor.result.js b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-constructor.result.js
index 8ce99fe..768e362 100644
--- a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-constructor.result.js
+++ b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-constructor.result.js
@@ -220,6 +220,7 @@ module.exports = {
                             ],
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-instance-member.result.js b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-instance-member.result.js
index 1195e1b..7f7a515 100644
--- a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-instance-member.result.js
+++ b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-instance-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -572,4 +573,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-static-member.result.js b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-static-member.result.js
index 052a238..6d44940 100644
--- a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-static-member.result.js
+++ b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-decorator-static-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-instance-member.result.js b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-instance-member.result.js
index 4737dab..a723cb8 100644
--- a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-instance-member.result.js
+++ b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-instance-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
@@ -716,4 +717,4 @@ module.exports = {
             }
         }
     ]
-};
\ No newline at end of file
+};
diff --git a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-static-member.result.js b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-static-member.result.js
index 552b0c1..661c38f 100644
--- a/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-static-member.result.js
+++ b/tests/fixtures/typescript/decorators/parameter-decorators/parameter-decorator-static-member.result.js
@@ -91,6 +91,7 @@ module.exports = {
                             "id": null,
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "body": {
                                 "type": "BlockStatement",
                                 "range": [
diff --git a/tests/fixtures/typescript/namespaces-and-modules/declare-namespace-with-exported-function.result.js b/tests/fixtures/typescript/namespaces-and-modules/declare-namespace-with-exported-function.result.js
index 9768931..47242ab 100644
--- a/tests/fixtures/typescript/namespaces-and-modules/declare-namespace-with-exported-function.result.js
+++ b/tests/fixtures/typescript/namespaces-and-modules/declare-namespace-with-exported-function.result.js
@@ -123,6 +123,7 @@ module.exports = {
                             },
                             "generator": false,
                             "expression": false,
+                            "async": false,
                             "params": [
                                 {
                                     "type": "Identifier",