diff --git a/package.json b/package.json
index 6fce64c..4011dfc 100644
--- a/package.json
+++ b/package.json
@@ -27,16 +27,20 @@
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
   "files": [
-    "index.js"
+    "index.js",
+    "types/index.d.ts"
   ],
+  "types": "types",
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "mdast-util-to-string": "^1.0.0",
-    "micromark": "~2.9.0",
+    "micromark": "~2.10.0",
     "parse-entities": "^2.0.0"
   },
   "devDependencies": {
     "browserify": "^16.0.0",
     "commonmark.json": "^0.29.0",
+    "dtslint": "^4.0.0",
     "gzip-size-cli": "^3.0.0",
     "hast-util-to-html": "^7.0.0",
     "mdast-util-to-hast": "^10.0.0",
@@ -57,7 +61,8 @@
     "generate": "npm run generate-size",
     "test-api": "node test",
     "test-coverage": "nyc --reporter lcov tape test/index.js",
-    "test": "npm run format && npm run generate && npm run test-coverage"
+    "test-types": "dtslint types",
+    "test": "npm run format && npm run generate && npm run test-coverage && npm run test-types"
   },
   "nyc": {
     "check-coverage": true,
diff --git a/types/index.d.ts b/types/index.d.ts
new file mode 100644
index 0000000..cb858ad
--- /dev/null
+++ b/types/index.d.ts
@@ -0,0 +1,34 @@
+// Minimum TypeScript Version: 3.0
+import {
+  Buffer,
+  BufferEncoding,
+  SyntaxExtension,
+  Token
+} from 'micromark/dist/shared-types'
+import {Root} from 'mdast'
+import {Type} from 'micromark/dist/constant/types'
+
+export = fromMarkdown
+
+declare namespace fromMarkdown {
+  interface MdastExtension {
+    enter: Record<Type, (token: Token) => void>
+    exit: Record<Type, (token: Token) => void>
+  }
+
+  interface Options {
+    extensions?: SyntaxExtension[]
+    mdastExtensions?: MdastExtension[]
+  }
+}
+
+declare function fromMarkdown(
+  value: string | Buffer,
+  options?: fromMarkdown.Options
+): Root
+
+declare function fromMarkdown(
+  value: string | Buffer,
+  encoding?: BufferEncoding,
+  options?: fromMarkdown.Options
+): Root
diff --git a/types/mdast-util-from-markdown.test.ts b/types/mdast-util-from-markdown.test.ts
new file mode 100644
index 0000000..a574e5c
--- /dev/null
+++ b/types/mdast-util-from-markdown.test.ts
@@ -0,0 +1,25 @@
+// This file is for https://github.com/microsoft/dtslint .
+// Tests are type-checked, but not run.
+
+import * as fromMarkdown from 'mdast-util-from-markdown'
+
+function main() {
+  const raw = '# text **strong**'
+
+  // $ExpectType Root
+  fromMarkdown(raw)
+
+  // $ExpectType Root
+  fromMarkdown(Buffer.alloc(8))
+
+  // $ExpectType Root
+  fromMarkdown(Buffer.alloc(8), {extensions: []})
+
+  // $ExpectType Root
+  fromMarkdown(Buffer.alloc(8), 'utf-8', {mdastExtensions: []})
+
+  // $ExpectError
+  fromMarkdown(Buffer.alloc(8), 'utf-8', {allowDangerousHtml: true})
+}
+
+main()
diff --git a/types/tsconfig.json b/types/tsconfig.json
new file mode 100644
index 0000000..9a36131
--- /dev/null
+++ b/types/tsconfig.json
@@ -0,0 +1,15 @@
+{
+    "compilerOptions": {
+        "moduleResolution": "node",
+        "lib": [
+            "ES5"
+        ],
+        "strict": true,
+        "baseUrl": ".",
+        "paths": {
+            "mdast-util-from-markdown": [
+                "./index.d.ts"
+            ]
+        }
+    }
+}
diff --git a/types/tslint.json b/types/tslint.json
new file mode 100644
index 0000000..9001796
--- /dev/null
+++ b/types/tslint.json
@@ -0,0 +1,7 @@
+{
+    "extends": "dtslint/dtslint.json",
+    "rules": {
+        "semicolon": false,
+        "whitespace": false
+    }
+}