diff --git a/package-lock.json b/package-lock.json
index b87d3a2..e6b55d0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,2019 +1,24 @@
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-      "dev": true
+    "lodash": {
+      "version": "4.17.4",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
+      "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4="
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-      "integrity": "sha1-GwgSq7jYBdSJZvjfOF3J2syaGdg=",
-      "dev": true
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.2.tgz",
+      "integrity": "sha1-PFtv1/beCRQmkCfwPAlGdY92c6Q="
     }
   }
 }
diff --git a/package.json b/package.json
index fa67c9d..45ee06a 100644
--- a/package.json
+++ b/package.json
@@ -33,13 +33,15 @@
     "chalk": "^1.1.3",
     "commander": "^2.10.0",
     "glob": "^7.1.2",
-    "typescript": "^2.4.0"
+    "lodash": "^4.17.4",
+    "typescript": "^2.6.2"
   },
   "devDependencies": {
     "@types/chalk": "^0.4.31",
     "@types/commander": "^2.9.1",
     "@types/glob": "^5.0.30",
     "@types/jest": "^20.0.2",
+    "@types/lodash": "^4.14.93",
     "@types/node": "^8.0.2",
     "@types/react": "^15.0.31",
     "jest": "^20.0.4",
diff --git a/src/helpers/index.ts b/src/helpers/index.ts
index 42e54e4..243bdbf 100644
--- a/src/helpers/index.ts
+++ b/src/helpers/index.ts
@@ -1,7 +1,5 @@
 import * as ts from 'typescript';
-import * as kinds from './isKind';
-
-export * from './isKind';
+import * as _ from 'lodash';
 
 /**
  * If a class declaration a react class?
@@ -54,7 +52,7 @@ export function isReactComponent(classDeclaration: ts.ClassDeclaration, typeChec
 export function isReactHeritageClause(clause: ts.HeritageClause) {
     return clause.token === ts.SyntaxKind.ExtendsKeyword &&
         clause.types.length === 1 &&
-        kinds.isExpressionWithTypeArguments(clause.types[0]) &&
+        ts.isExpressionWithTypeArguments(clause.types[0]) &&
         /Component/.test(clause.types[0].expression.getText());
 }
 
@@ -65,10 +63,10 @@ export function isReactHeritageClause(clause: ts.HeritageClause) {
  * @param statement
  */
 export function isReactPropTypeAssignmentStatement(statement: ts.Statement): statement is ts.ExpressionStatement {
-    return kinds.isExpressionStatement(statement)
-        && kinds.isBinaryExpression(statement.expression)
+    return ts.isExpressionStatement(statement)
+        && ts.isBinaryExpression(statement.expression)
         && statement.expression.operatorToken.kind === ts.SyntaxKind.FirstAssignment
-        && kinds.isPropertyAccessExpression(statement.expression.left)
+        && ts.isPropertyAccessExpression(statement.expression.left)
         && /\.propTypes$|\.propTypes\..+$/.test(statement.expression.left.getText())
 }
 
@@ -80,7 +78,7 @@ export function hasStaticModifier(classMember: ts.ClassElement) {
     if (!classMember.modifiers) {
         return false;
     }
-    const staticModifier = find(classMember.modifiers, (modifier) => {
+    const staticModifier = _.find(classMember.modifiers, (modifier) => {
         return modifier.kind == ts.SyntaxKind.StaticKeyword;
     });
     return staticModifier !== undefined;
@@ -99,49 +97,18 @@ export function isPropTypesMember(classMember: ts.ClassElement, sourceFile: ts.S
     }
 }
 
-// TODO: replace following functions with Lodash?
-// ---------------------------------------------------------------------------------------------------------
-
-/**
- * Find an item in a collection with a matcher
- * @param collection
- * @param matcher
- */
-export function find<T>(collection: T[], matcher: (item: T) => boolean): T | undefined {
-    for (const item of collection) {
-        if (matcher(item)) { return item; }
-    }
-
-    return undefined;
-}
-
-/**
- * Look in a collection and see if collection has a specific item
- * @param collection
- * @param matcher
- */
-export function has<T>(collection: T[], matcher: (item: T) => boolean): boolean {
-    if (!collection || !collection.length) {
-        return false;
-    }
-
-    for (const item of collection) {
-        if (matcher(item)) { return true; }
-    }
-
-    return false;
-}
-
 /**
  * Insert an item in middle of an array after a specific item
  * @param collection
  * @param afterItem
  * @param newItem
  */
-export function insertAfter<T>(collection: T[], afterItem: T, newItem: T) {
-    const index = collection.indexOf(afterItem) + 1;
+export function insertAfter<T>(collection: ArrayLike<T>, afterItem: T, newItem: T) {
+    const index = _.indexOf(collection, afterItem) + 1;
 
-    return collection.slice(0, index).concat(newItem).concat(collection.slice(index));
+    return _.slice(collection, 0, index)
+        .concat(newItem)
+        .concat(_.slice(collection, index));
 }
 
 /**
@@ -150,10 +117,12 @@ export function insertAfter<T>(collection: T[], afterItem: T, newItem: T) {
  * @param beforeItem
  * @param newItem
  */
-export function insertBefore<T>(collection: T[], beforeItem: T, newItem: T) {
-    const index = collection.indexOf(beforeItem);
+export function insertBefore<T>(collection: ArrayLike<T>, beforeItem: T, newItems: T | T[]) {
+    const index = _.indexOf(collection, beforeItem);
 
-    return collection.slice(0, index).concat(newItem).concat(collection.slice(index));
+    return _.slice(collection, 0, index)
+        .concat(newItems)
+        .concat(_.slice(collection, index));
 }
 
 /**
@@ -162,10 +131,11 @@ export function insertBefore<T>(collection: T[], beforeItem: T, newItem: T) {
  * @param item
  * @param newItem
  */
-export function replaceItem<T>(collection: T[], item: T, newItem: T) {
-    const index = collection.indexOf(item);
-
-    return collection.slice(0, index).concat(newItem).concat(collection.slice(index + 1));
+export function replaceItem<T>(collection: ArrayLike<T>, item: T, newItem: T) {
+    const index = _.indexOf(collection, item);
+    return _.slice(collection, 0, index)
+        .concat(newItem)
+        .concat(_.slice(collection, index + 1));
 }
 
 /**
@@ -174,8 +144,7 @@ export function replaceItem<T>(collection: T[], item: T, newItem: T) {
  * @param item
  * @param newItem
  */
-export function removeItem<T>(collection: T[], item: T) {
-    const index = collection.indexOf(item);
-
-    return collection.slice(0, index).concat(collection.slice(index + 1));
+export function removeItem<T>(collection: ArrayLike<T>, item: T) {
+    const index = _.indexOf(collection, item);
+    return _.slice(collection, 0, index).concat(_.slice(collection, index + 1));
 }
diff --git a/src/helpers/isKind.ts b/src/helpers/isKind.ts
deleted file mode 100644
index 8756ad9..0000000
--- a/src/helpers/isKind.ts
+++ /dev/null
@@ -1,1185 +0,0 @@
-import * as ts from 'typescript';
-
-/**
- * Return true if node is `EndOfFileToken`
- * @param node A TypeScript node
- */
-export function isEndOfFileToken(node: ts.Node): node is ts.EndOfFileToken {
-    return node.kind === ts.SyntaxKind.EndOfFileToken;
-}
-
-/**
- * Return true if node is `NumericLiteral`
- * @param node A TypeScript node
- */
-export function isNumericLiteral(node: ts.Node): node is ts.NumericLiteral {
-    return node.kind === ts.SyntaxKind.NumericLiteral;
-}
-
-/**
- * Return true if node is `StringLiteral`
- * @param node A TypeScript node
- */
-export function isStringLiteral(node: ts.Node): node is ts.StringLiteral {
-    return node.kind === ts.SyntaxKind.StringLiteral;
-}
-
-/**
- * Return true if node is `JsxText`
- * @param node A TypeScript node
- */
-export function isJsxText(node: ts.Node): node is ts.JsxText {
-    return node.kind === ts.SyntaxKind.JsxText;
-}
-
-/**
- * Return true if node is `RegularExpressionLiteral`
- * @param node A TypeScript node
- */
-export function isRegularExpressionLiteral(node: ts.Node): node is ts.RegularExpressionLiteral {
-    return node.kind === ts.SyntaxKind.RegularExpressionLiteral;
-}
-
-/**
- * Return true if node is `NoSubstitutionTemplateLiteral`
- * @param node A TypeScript node
- */
-export function isNoSubstitutionTemplateLiteral(node: ts.Node): node is ts.NoSubstitutionTemplateLiteral {
-    return node.kind === ts.SyntaxKind.NoSubstitutionTemplateLiteral;
-}
-
-/**
- * Return true if node is `TemplateHead`
- * @param node A TypeScript node
- */
-export function isTemplateHead(node: ts.Node): node is ts.TemplateHead {
-    return node.kind === ts.SyntaxKind.TemplateHead;
-}
-
-/**
- * Return true if node is `TemplateMiddle`
- * @param node A TypeScript node
- */
-export function isTemplateMiddle(node: ts.Node): node is ts.TemplateMiddle {
-    return node.kind === ts.SyntaxKind.TemplateMiddle;
-}
-
-/**
- * Return true if node is `TemplateTail`
- * @param node A TypeScript node
- */
-export function isTemplateTail(node: ts.Node): node is ts.TemplateTail {
-    return node.kind === ts.SyntaxKind.TemplateTail;
-}
-
-/**
- * Return true if node is `DotDotDotToken`
- * @param node A TypeScript node
- */
-export function isDotDotDotToken(node: ts.Node): node is ts.DotDotDotToken {
-    return node.kind === ts.SyntaxKind.DotDotDotToken;
-}
-
-/**
- * Return true if node is `EqualsGreaterThanToken`
- * @param node A TypeScript node
- */
-export function isEqualsGreaterThanToken(node: ts.Node): node is ts.EqualsGreaterThanToken {
-    return node.kind === ts.SyntaxKind.EqualsGreaterThanToken;
-}
-
-/**
- * Return true if node is `AsteriskToken`
- * @param node A TypeScript node
- */
-export function isAsteriskToken(node: ts.Node): node is ts.AsteriskToken {
-    return node.kind === ts.SyntaxKind.AsteriskToken;
-}
-
-/**
- * Return true if node is `QuestionToken`
- * @param node A TypeScript node
- */
-export function isQuestionToken(node: ts.Node): node is ts.QuestionToken {
-    return node.kind === ts.SyntaxKind.QuestionToken;
-}
-
-/**
- * Return true if node is `ColonToken`
- * @param node A TypeScript node
- */
-export function isColonToken(node: ts.Node): node is ts.ColonToken {
-    return node.kind === ts.SyntaxKind.ColonToken;
-}
-
-/**
- * Return true if node is `AtToken`
- * @param node A TypeScript node
- */
-export function isAtToken(node: ts.Node): node is ts.AtToken {
-    return node.kind === ts.SyntaxKind.AtToken;
-}
-
-/**
- * Return true if node is `EqualsToken`
- * @param node A TypeScript node
- */
-export function isEqualsToken(node: ts.Node): node is ts.EqualsToken {
-    return node.kind === ts.SyntaxKind.EqualsToken;
-}
-
-/**
- * Return true if node is `Identifier`
- * @param node A TypeScript node
- */
-export function isIdentifier(node: ts.Node): node is ts.Identifier {
-    return node.kind === ts.SyntaxKind.Identifier;
-}
-
-/**
- * Return true if node is `QualifiedName`
- * @param node A TypeScript node
- */
-export function isQualifiedName(node: ts.Node): node is ts.QualifiedName {
-    return node.kind === ts.SyntaxKind.QualifiedName;
-}
-
-/**
- * Return true if node is `ComputedPropertyName`
- * @param node A TypeScript node
- */
-export function isComputedPropertyName(node: ts.Node): node is ts.ComputedPropertyName {
-    return node.kind === ts.SyntaxKind.ComputedPropertyName;
-}
-
-/**
- * Return true if node is `Decorator`
- * @param node A TypeScript node
- */
-export function isDecorator(node: ts.Node): node is ts.Decorator {
-    return node.kind === ts.SyntaxKind.Decorator;
-}
-
-/**
- * Return true if node is `PropertySignature`
- * @param node A TypeScript node
- */
-export function isPropertySignature(node: ts.Node): node is ts.PropertySignature {
-    return node.kind === ts.SyntaxKind.PropertySignature;
-}
-
-/**
- * Return true if node is `PropertyDeclaration`
- * @param node A TypeScript node
- */
-export function isPropertyDeclaration(node: ts.Node): node is ts.PropertyDeclaration {
-    return node.kind === ts.SyntaxKind.PropertyDeclaration;
-}
-
-/**
- * Return true if node is `MethodSignature`
- * @param node A TypeScript node
- */
-export function isMethodSignature(node: ts.Node): node is ts.MethodSignature {
-    return node.kind === ts.SyntaxKind.MethodSignature;
-}
-
-/**
- * Return true if node is `MethodDeclaration`
- * @param node A TypeScript node
- */
-export function isMethodDeclaration(node: ts.Node): node is ts.MethodDeclaration {
-    return node.kind === ts.SyntaxKind.MethodDeclaration;
-}
-
-/**
- * Return true if node is `ObjectBindingPattern`
- * @param node A TypeScript node
- */
-export function isObjectBindingPattern(node: ts.Node): node is ts.ObjectBindingPattern {
-    return node.kind === ts.SyntaxKind.ObjectBindingPattern;
-}
-
-/**
- * Return true if node is `ArrayBindingPattern`
- * @param node A TypeScript node
- */
-export function isArrayBindingPattern(node: ts.Node): node is ts.ArrayBindingPattern {
-    return node.kind === ts.SyntaxKind.ArrayBindingPattern;
-}
-
-/**
- * Return true if node is `BindingElement`
- * @param node A TypeScript node
- */
-export function isBindingElement(node: ts.Node): node is ts.BindingElement {
-    return node.kind === ts.SyntaxKind.BindingElement;
-}
-
-/**
- * Return true if node is `ArrayLiteralExpression`
- * @param node A TypeScript node
- */
-export function isArrayLiteralExpression(node: ts.Node): node is ts.ArrayLiteralExpression {
-    return node.kind === ts.SyntaxKind.ArrayLiteralExpression;
-}
-
-/**
- * Return true if node is `ObjectLiteralExpression`
- * @param node A TypeScript node
- */
-export function isObjectLiteralExpression(node: ts.Node): node is ts.ObjectLiteralExpression {
-    return node.kind === ts.SyntaxKind.ObjectLiteralExpression;
-}
-
-/**
- * Return true if node is `PropertyAccessExpression`
- * @param node A TypeScript node
- */
-export function isPropertyAccessExpression(node: ts.Node): node is ts.PropertyAccessExpression {
-    return node.kind === ts.SyntaxKind.PropertyAccessExpression;
-}
-
-/**
- * Return true if node is `ElementAccessExpression`
- * @param node A TypeScript node
- */
-export function isElementAccessExpression(node: ts.Node): node is ts.ElementAccessExpression {
-    return node.kind === ts.SyntaxKind.ElementAccessExpression;
-}
-
-/**
- * Return true if node is `CallExpression`
- * @param node A TypeScript node
- */
-export function isCallExpression(node: ts.Node): node is ts.CallExpression {
-    return node.kind === ts.SyntaxKind.CallExpression;
-}
-
-/**
- * Return true if node is `NewExpression`
- * @param node A TypeScript node
- */
-export function isNewExpression(node: ts.Node): node is ts.NewExpression {
-    return node.kind === ts.SyntaxKind.NewExpression;
-}
-
-/**
- * Return true if node is `TaggedTemplateExpression`
- * @param node A TypeScript node
- */
-export function isTaggedTemplateExpression(node: ts.Node): node is ts.TaggedTemplateExpression {
-    return node.kind === ts.SyntaxKind.TaggedTemplateExpression;
-}
-
-/**
- * Return true if node is `ParenthesizedExpression`
- * @param node A TypeScript node
- */
-export function isParenthesizedExpression(node: ts.Node): node is ts.ParenthesizedExpression {
-    return node.kind === ts.SyntaxKind.ParenthesizedExpression;
-}
-
-/**
- * Return true if node is `FunctionExpression`
- * @param node A TypeScript node
- */
-export function isFunctionExpression(node: ts.Node): node is ts.FunctionExpression {
-    return node.kind === ts.SyntaxKind.FunctionExpression;
-}
-
-/**
- * Return true if node is `ArrowFunction`
- * @param node A TypeScript node
- */
-export function isArrowFunction(node: ts.Node): node is ts.ArrowFunction {
-    return node.kind === ts.SyntaxKind.ArrowFunction;
-}
-
-/**
- * Return true if node is `DeleteExpression`
- * @param node A TypeScript node
- */
-export function isDeleteExpression(node: ts.Node): node is ts.DeleteExpression {
-    return node.kind === ts.SyntaxKind.DeleteExpression;
-}
-
-/**
- * Return true if node is `TypeOfExpression`
- * @param node A TypeScript node
- */
-export function isTypeOfExpression(node: ts.Node): node is ts.TypeOfExpression {
-    return node.kind === ts.SyntaxKind.TypeOfExpression;
-}
-
-/**
- * Return true if node is `VoidExpression`
- * @param node A TypeScript node
- */
-export function isVoidExpression(node: ts.Node): node is ts.VoidExpression {
-    return node.kind === ts.SyntaxKind.VoidExpression;
-}
-
-/**
- * Return true if node is `AwaitExpression`
- * @param node A TypeScript node
- */
-export function isAwaitExpression(node: ts.Node): node is ts.AwaitExpression {
-    return node.kind === ts.SyntaxKind.AwaitExpression;
-}
-
-/**
- * Return true if node is `PrefixUnaryExpression`
- * @param node A TypeScript node
- */
-export function isPrefixUnaryExpression(node: ts.Node): node is ts.PrefixUnaryExpression {
-    return node.kind === ts.SyntaxKind.PrefixUnaryExpression;
-}
-
-/**
- * Return true if node is `PostfixUnaryExpression`
- * @param node A TypeScript node
- */
-export function isPostfixUnaryExpression(node: ts.Node): node is ts.PostfixUnaryExpression {
-    return node.kind === ts.SyntaxKind.PostfixUnaryExpression;
-}
-
-/**
- * Return true if node is `BinaryExpression`
- * @param node A TypeScript node
- */
-export function isBinaryExpression(node: ts.Node): node is ts.BinaryExpression {
-    return node.kind === ts.SyntaxKind.BinaryExpression;
-}
-
-/**
- * Return true if node is `ConditionalExpression`
- * @param node A TypeScript node
- */
-export function isConditionalExpression(node: ts.Node): node is ts.ConditionalExpression {
-    return node.kind === ts.SyntaxKind.ConditionalExpression;
-}
-
-/**
- * Return true if node is `TemplateExpression`
- * @param node A TypeScript node
- */
-export function isTemplateExpression(node: ts.Node): node is ts.TemplateExpression {
-    return node.kind === ts.SyntaxKind.TemplateExpression;
-}
-
-/**
- * Return true if node is `YieldExpression`
- * @param node A TypeScript node
- */
-export function isYieldExpression(node: ts.Node): node is ts.YieldExpression {
-    return node.kind === ts.SyntaxKind.YieldExpression;
-}
-
-/**
- * Return true if node is `SpreadElement`
- * @param node A TypeScript node
- */
-export function isSpreadElement(node: ts.Node): node is ts.SpreadElement {
-    return node.kind === ts.SyntaxKind.SpreadElement;
-}
-
-/**
- * Return true if node is `ClassExpression`
- * @param node A TypeScript node
- */
-export function isClassExpression(node: ts.Node): node is ts.ClassExpression {
-    return node.kind === ts.SyntaxKind.ClassExpression;
-}
-
-/**
- * Return true if node is `OmittedExpression`
- * @param node A TypeScript node
- */
-export function isOmittedExpression(node: ts.Node): node is ts.OmittedExpression {
-    return node.kind === ts.SyntaxKind.OmittedExpression;
-}
-
-/**
- * Return true if node is `ExpressionWithTypeArguments`
- * @param node A TypeScript node
- */
-export function isExpressionWithTypeArguments(node: ts.Node): node is ts.ExpressionWithTypeArguments {
-    return node.kind === ts.SyntaxKind.ExpressionWithTypeArguments;
-}
-
-/**
- * Return true if node is `AsExpression`
- * @param node A TypeScript node
- */
-export function isAsExpression(node: ts.Node): node is ts.AsExpression {
-    return node.kind === ts.SyntaxKind.AsExpression;
-}
-
-/**
- * Return true if node is `NonNullExpression`
- * @param node A TypeScript node
- */
-export function isNonNullExpression(node: ts.Node): node is ts.NonNullExpression {
-    return node.kind === ts.SyntaxKind.NonNullExpression;
-}
-
-/**
- * Return true if node is `MetaProperty`
- * @param node A TypeScript node
- */
-export function isMetaProperty(node: ts.Node): node is ts.MetaProperty {
-    return node.kind === ts.SyntaxKind.MetaProperty;
-}
-
-/**
- * Return true if node is `TemplateSpan`
- * @param node A TypeScript node
- */
-export function isTemplateSpan(node: ts.Node): node is ts.TemplateSpan {
-    return node.kind === ts.SyntaxKind.TemplateSpan;
-}
-
-/**
- * Return true if node is `SemicolonClassElement`
- * @param node A TypeScript node
- */
-export function isSemicolonClassElement(node: ts.Node): node is ts.SemicolonClassElement {
-    return node.kind === ts.SyntaxKind.SemicolonClassElement;
-}
-
-/**
- * Return true if node is `Block`
- * @param node A TypeScript node
- */
-export function isBlock(node: ts.Node): node is ts.Block {
-    return node.kind === ts.SyntaxKind.Block;
-}
-
-/**
- * Return true if node is `VariableStatement`
- * @param node A TypeScript node
- */
-export function isVariableStatement(node: ts.Node): node is ts.VariableStatement {
-    return node.kind === ts.SyntaxKind.VariableStatement;
-}
-
-/**
- * Return true if node is `EmptyStatement`
- * @param node A TypeScript node
- */
-export function isEmptyStatement(node: ts.Node): node is ts.EmptyStatement {
-    return node.kind === ts.SyntaxKind.EmptyStatement;
-}
-
-/**
- * Return true if node is `ExpressionStatement`
- * @param node A TypeScript node
- */
-export function isExpressionStatement(node: ts.Node): node is ts.ExpressionStatement {
-    return node.kind === ts.SyntaxKind.ExpressionStatement;
-}
-
-/**
- * Return true if node is `IfStatement`
- * @param node A TypeScript node
- */
-export function isIfStatement(node: ts.Node): node is ts.IfStatement {
-    return node.kind === ts.SyntaxKind.IfStatement;
-}
-
-/**
- * Return true if node is `DoStatement`
- * @param node A TypeScript node
- */
-export function isDoStatement(node: ts.Node): node is ts.DoStatement {
-    return node.kind === ts.SyntaxKind.DoStatement;
-}
-
-/**
- * Return true if node is `WhileStatement`
- * @param node A TypeScript node
- */
-export function isWhileStatement(node: ts.Node): node is ts.WhileStatement {
-    return node.kind === ts.SyntaxKind.WhileStatement;
-}
-
-/**
- * Return true if node is `ForStatement`
- * @param node A TypeScript node
- */
-export function isForStatement(node: ts.Node): node is ts.ForStatement {
-    return node.kind === ts.SyntaxKind.ForStatement;
-}
-
-/**
- * Return true if node is `ForInStatement`
- * @param node A TypeScript node
- */
-export function isForInStatement(node: ts.Node): node is ts.ForInStatement {
-    return node.kind === ts.SyntaxKind.ForInStatement;
-}
-
-/**
- * Return true if node is `ForOfStatement`
- * @param node A TypeScript node
- */
-export function isForOfStatement(node: ts.Node): node is ts.ForOfStatement {
-    return node.kind === ts.SyntaxKind.ForOfStatement;
-}
-
-/**
- * Return true if node is `ContinueStatement`
- * @param node A TypeScript node
- */
-export function isContinueStatement(node: ts.Node): node is ts.ContinueStatement {
-    return node.kind === ts.SyntaxKind.ContinueStatement;
-}
-
-/**
- * Return true if node is `BreakStatement`
- * @param node A TypeScript node
- */
-export function isBreakStatement(node: ts.Node): node is ts.BreakStatement {
-    return node.kind === ts.SyntaxKind.BreakStatement;
-}
-
-/**
- * Return true if node is `ReturnStatement`
- * @param node A TypeScript node
- */
-export function isReturnStatement(node: ts.Node): node is ts.ReturnStatement {
-    return node.kind === ts.SyntaxKind.ReturnStatement;
-}
-
-/**
- * Return true if node is `WithStatement`
- * @param node A TypeScript node
- */
-export function isWithStatement(node: ts.Node): node is ts.WithStatement {
-    return node.kind === ts.SyntaxKind.WithStatement;
-}
-
-/**
- * Return true if node is `SwitchStatement`
- * @param node A TypeScript node
- */
-export function isSwitchStatement(node: ts.Node): node is ts.SwitchStatement {
-    return node.kind === ts.SyntaxKind.SwitchStatement;
-}
-
-/**
- * Return true if node is `LabeledStatement`
- * @param node A TypeScript node
- */
-export function isLabeledStatement(node: ts.Node): node is ts.LabeledStatement {
-    return node.kind === ts.SyntaxKind.LabeledStatement;
-}
-
-/**
- * Return true if node is `ThrowStatement`
- * @param node A TypeScript node
- */
-export function isThrowStatement(node: ts.Node): node is ts.ThrowStatement {
-    return node.kind === ts.SyntaxKind.ThrowStatement;
-}
-
-/**
- * Return true if node is `TryStatement`
- * @param node A TypeScript node
- */
-export function isTryStatement(node: ts.Node): node is ts.TryStatement {
-    return node.kind === ts.SyntaxKind.TryStatement;
-}
-
-/**
- * Return true if node is `DebuggerStatement`
- * @param node A TypeScript node
- */
-export function isDebuggerStatement(node: ts.Node): node is ts.DebuggerStatement {
-    return node.kind === ts.SyntaxKind.DebuggerStatement;
-}
-
-/**
- * Return true if node is `VariableDeclaration`
- * @param node A TypeScript node
- */
-export function isVariableDeclaration(node: ts.Node): node is ts.VariableDeclaration {
-    return node.kind === ts.SyntaxKind.VariableDeclaration;
-}
-
-/**
- * Return true if node is `VariableDeclarationList`
- * @param node A TypeScript node
- */
-export function isVariableDeclarationList(node: ts.Node): node is ts.VariableDeclarationList {
-    return node.kind === ts.SyntaxKind.VariableDeclarationList;
-}
-
-/**
- * Return true if node is `FunctionDeclaration`
- * @param node A TypeScript node
- */
-export function isFunctionDeclaration(node: ts.Node): node is ts.FunctionDeclaration {
-    return node.kind === ts.SyntaxKind.FunctionDeclaration;
-}
-
-/**
- * Return true if node is `ClassDeclaration`
- * @param node A TypeScript node
- */
-export function isClassDeclaration(node: ts.Node): node is ts.ClassDeclaration {
-    return node.kind === ts.SyntaxKind.ClassDeclaration;
-}
-
-/**
- * Return true if node is `InterfaceDeclaration`
- * @param node A TypeScript node
- */
-export function isInterfaceDeclaration(node: ts.Node): node is ts.InterfaceDeclaration {
-    return node.kind === ts.SyntaxKind.InterfaceDeclaration;
-}
-
-/**
- * Return true if node is `TypeAliasDeclaration`
- * @param node A TypeScript node
- */
-export function isTypeAliasDeclaration(node: ts.Node): node is ts.TypeAliasDeclaration {
-    return node.kind === ts.SyntaxKind.TypeAliasDeclaration;
-}
-
-/**
- * Return true if node is `EnumDeclaration`
- * @param node A TypeScript node
- */
-export function isEnumDeclaration(node: ts.Node): node is ts.EnumDeclaration {
-    return node.kind === ts.SyntaxKind.EnumDeclaration;
-}
-
-/**
- * Return true if node is `ModuleDeclaration`
- * @param node A TypeScript node
- */
-export function isModuleDeclaration(node: ts.Node): node is ts.ModuleDeclaration {
-    return node.kind === ts.SyntaxKind.ModuleDeclaration;
-}
-
-/**
- * Return true if node is `ModuleBlock`
- * @param node A TypeScript node
- */
-export function isModuleBlock(node: ts.Node): node is ts.ModuleBlock {
-    return node.kind === ts.SyntaxKind.ModuleBlock;
-}
-
-/**
- * Return true if node is `CaseBlock`
- * @param node A TypeScript node
- */
-export function isCaseBlock(node: ts.Node): node is ts.CaseBlock {
-    return node.kind === ts.SyntaxKind.CaseBlock;
-}
-
-/**
- * Return true if node is `NamespaceExportDeclaration`
- * @param node A TypeScript node
- */
-export function isNamespaceExportDeclaration(node: ts.Node): node is ts.NamespaceExportDeclaration {
-    return node.kind === ts.SyntaxKind.NamespaceExportDeclaration;
-}
-
-/**
- * Return true if node is `ImportEqualsDeclaration`
- * @param node A TypeScript node
- */
-export function isImportEqualsDeclaration(node: ts.Node): node is ts.ImportEqualsDeclaration {
-    return node.kind === ts.SyntaxKind.ImportEqualsDeclaration;
-}
-
-/**
- * Return true if node is `ImportDeclaration`
- * @param node A TypeScript node
- */
-export function isImportDeclaration(node: ts.Node): node is ts.ImportDeclaration {
-    return node.kind === ts.SyntaxKind.ImportDeclaration;
-}
-
-/**
- * Return true if node is `ImportClause`
- * @param node A TypeScript node
- */
-export function isImportClause(node: ts.Node): node is ts.ImportClause {
-    return node.kind === ts.SyntaxKind.ImportClause;
-}
-
-/**
- * Return true if node is `NamespaceImport`
- * @param node A TypeScript node
- */
-export function isNamespaceImport(node: ts.Node): node is ts.NamespaceImport {
-    return node.kind === ts.SyntaxKind.NamespaceImport;
-}
-
-/**
- * Return true if node is `NamedImports`
- * @param node A TypeScript node
- */
-export function isNamedImports(node: ts.Node): node is ts.NamedImports {
-    return node.kind === ts.SyntaxKind.NamedImports;
-}
-
-/**
- * Return true if node is `ImportSpecifier`
- * @param node A TypeScript node
- */
-export function isImportSpecifier(node: ts.Node): node is ts.ImportSpecifier {
-    return node.kind === ts.SyntaxKind.ImportSpecifier;
-}
-
-/**
- * Return true if node is `ExportAssignment`
- * @param node A TypeScript node
- */
-export function isExportAssignment(node: ts.Node): node is ts.ExportAssignment {
-    return node.kind === ts.SyntaxKind.ExportAssignment;
-}
-
-/**
- * Return true if node is `ExportDeclaration`
- * @param node A TypeScript node
- */
-export function isExportDeclaration(node: ts.Node): node is ts.ExportDeclaration {
-    return node.kind === ts.SyntaxKind.ExportDeclaration;
-}
-
-/**
- * Return true if node is `NamedExports`
- * @param node A TypeScript node
- */
-export function isNamedExports(node: ts.Node): node is ts.NamedExports {
-    return node.kind === ts.SyntaxKind.NamedExports;
-}
-
-/**
- * Return true if node is `ExportSpecifier`
- * @param node A TypeScript node
- */
-export function isExportSpecifier(node: ts.Node): node is ts.ExportSpecifier {
-    return node.kind === ts.SyntaxKind.ExportSpecifier;
-}
-
-/**
- * Return true if node is `MissingDeclaration`
- * @param node A TypeScript node
- */
-export function isMissingDeclaration(node: ts.Node): node is ts.MissingDeclaration {
-    return node.kind === ts.SyntaxKind.MissingDeclaration;
-}
-
-/**
- * Return true if node is `ExternalModuleReference`
- * @param node A TypeScript node
- */
-export function isExternalModuleReference(node: ts.Node): node is ts.ExternalModuleReference {
-    return node.kind === ts.SyntaxKind.ExternalModuleReference;
-}
-
-/**
- * Return true if node is `JsxElement`
- * @param node A TypeScript node
- */
-export function isJsxElement(node: ts.Node): node is ts.JsxElement {
-    return node.kind === ts.SyntaxKind.JsxElement;
-}
-
-/**
- * Return true if node is `JsxSelfClosingElement`
- * @param node A TypeScript node
- */
-export function isJsxSelfClosingElement(node: ts.Node): node is ts.JsxSelfClosingElement {
-    return node.kind === ts.SyntaxKind.JsxSelfClosingElement;
-}
-
-/**
- * Return true if node is `JsxOpeningElement`
- * @param node A TypeScript node
- */
-export function isJsxOpeningElement(node: ts.Node): node is ts.JsxOpeningElement {
-    return node.kind === ts.SyntaxKind.JsxOpeningElement;
-}
-
-/**
- * Return true if node is `JsxClosingElement`
- * @param node A TypeScript node
- */
-export function isJsxClosingElement(node: ts.Node): node is ts.JsxClosingElement {
-    return node.kind === ts.SyntaxKind.JsxClosingElement;
-}
-
-/**
- * Return true if node is `JsxAttribute`
- * @param node A TypeScript node
- */
-export function isJsxAttribute(node: ts.Node): node is ts.JsxAttribute {
-    return node.kind === ts.SyntaxKind.JsxAttribute;
-}
-
-/**
- * Return true if node is `JsxAttributes`
- * @param node A TypeScript node
- */
-export function isJsxAttributes(node: ts.Node): node is ts.JsxAttributes {
-    return node.kind === ts.SyntaxKind.JsxAttributes;
-}
-
-/**
- * Return true if node is `JsxSpreadAttribute`
- * @param node A TypeScript node
- */
-export function isJsxSpreadAttribute(node: ts.Node): node is ts.JsxSpreadAttribute {
-    return node.kind === ts.SyntaxKind.JsxSpreadAttribute;
-}
-
-/**
- * Return true if node is `JsxExpression`
- * @param node A TypeScript node
- */
-export function isJsxExpression(node: ts.Node): node is ts.JsxExpression {
-    return node.kind === ts.SyntaxKind.JsxExpression;
-}
-
-/**
- * Return true if node is `CaseClause`
- * @param node A TypeScript node
- */
-export function isCaseClause(node: ts.Node): node is ts.CaseClause {
-    return node.kind === ts.SyntaxKind.CaseClause;
-}
-
-/**
- * Return true if node is `DefaultClause`
- * @param node A TypeScript node
- */
-export function isDefaultClause(node: ts.Node): node is ts.DefaultClause {
-    return node.kind === ts.SyntaxKind.DefaultClause;
-}
-
-/**
- * Return true if node is `HeritageClause`
- * @param node A TypeScript node
- */
-export function isHeritageClause(node: ts.Node): node is ts.HeritageClause {
-    return node.kind === ts.SyntaxKind.HeritageClause;
-}
-
-/**
- * Return true if node is `CatchClause`
- * @param node A TypeScript node
- */
-export function isCatchClause(node: ts.Node): node is ts.CatchClause {
-    return node.kind === ts.SyntaxKind.CatchClause;
-}
-
-/**
- * Return true if node is `PropertyAssignment`
- * @param node A TypeScript node
- */
-export function isPropertyAssignment(node: ts.Node): node is ts.PropertyAssignment {
-    return node.kind === ts.SyntaxKind.PropertyAssignment;
-}
-
-/**
- * Return true if node is `ShorthandPropertyAssignment`
- * @param node A TypeScript node
- */
-export function isShorthandPropertyAssignment(node: ts.Node): node is ts.ShorthandPropertyAssignment {
-    return node.kind === ts.SyntaxKind.ShorthandPropertyAssignment;
-}
-
-/**
- * Return true if node is `SpreadAssignment`
- * @param node A TypeScript node
- */
-export function isSpreadAssignment(node: ts.Node): node is ts.SpreadAssignment {
-    return node.kind === ts.SyntaxKind.SpreadAssignment;
-}
-
-/**
- * Return true if node is `EnumMember`
- * @param node A TypeScript node
- */
-export function isEnumMember(node: ts.Node): node is ts.EnumMember {
-    return node.kind === ts.SyntaxKind.EnumMember;
-}
-
-/**
- * Return true if node is `SourceFile`
- * @param node A TypeScript node
- */
-export function isSourceFile(node: ts.Node): node is ts.SourceFile {
-    return node.kind === ts.SyntaxKind.SourceFile;
-}
-
-/**
- * Return true if node is `Bundle`
- * @param node A TypeScript node
- */
-export function isBundle(node: ts.Node): node is ts.Bundle {
-    return node.kind === ts.SyntaxKind.Bundle;
-}
-
-/**
- * Return true if node is `JSDocTypeExpression`
- * @param node A TypeScript node
- */
-export function isJSDocTypeExpression(node: ts.Node): node is ts.JSDocTypeExpression {
-    return node.kind === ts.SyntaxKind.JSDocTypeExpression;
-}
-
-/**
- * Return true if node is `JSDocAllType`
- * @param node A TypeScript node
- */
-export function isJSDocAllType(node: ts.Node): node is ts.JSDocAllType {
-    return node.kind === ts.SyntaxKind.JSDocAllType;
-}
-
-/**
- * Return true if node is `JSDocUnknownType`
- * @param node A TypeScript node
- */
-export function isJSDocUnknownType(node: ts.Node): node is ts.JSDocUnknownType {
-    return node.kind === ts.SyntaxKind.JSDocUnknownType;
-}
-
-/**
- * Return true if node is `JSDocArrayType`
- * @param node A TypeScript node
- */
-export function isJSDocArrayType(node: ts.Node): node is ts.JSDocArrayType {
-    return node.kind === ts.SyntaxKind.JSDocArrayType;
-}
-
-/**
- * Return true if node is `JSDocUnionType`
- * @param node A TypeScript node
- */
-export function isJSDocUnionType(node: ts.Node): node is ts.JSDocUnionType {
-    return node.kind === ts.SyntaxKind.JSDocUnionType;
-}
-
-/**
- * Return true if node is `JSDocTupleType`
- * @param node A TypeScript node
- */
-export function isJSDocTupleType(node: ts.Node): node is ts.JSDocTupleType {
-    return node.kind === ts.SyntaxKind.JSDocTupleType;
-}
-
-/**
- * Return true if node is `JSDocNullableType`
- * @param node A TypeScript node
- */
-export function isJSDocNullableType(node: ts.Node): node is ts.JSDocNullableType {
-    return node.kind === ts.SyntaxKind.JSDocNullableType;
-}
-
-/**
- * Return true if node is `JSDocNonNullableType`
- * @param node A TypeScript node
- */
-export function isJSDocNonNullableType(node: ts.Node): node is ts.JSDocNonNullableType {
-    return node.kind === ts.SyntaxKind.JSDocNonNullableType;
-}
-
-/**
- * Return true if node is `JSDocRecordType`
- * @param node A TypeScript node
- */
-export function isJSDocRecordType(node: ts.Node): node is ts.JSDocRecordType {
-    return node.kind === ts.SyntaxKind.JSDocRecordType;
-}
-
-/**
- * Return true if node is `JSDocRecordMember`
- * @param node A TypeScript node
- */
-export function isJSDocRecordMember(node: ts.Node): node is ts.JSDocRecordMember {
-    return node.kind === ts.SyntaxKind.JSDocRecordMember;
-}
-
-/**
- * Return true if node is `JSDocTypeReference`
- * @param node A TypeScript node
- */
-export function isJSDocTypeReference(node: ts.Node): node is ts.JSDocTypeReference {
-    return node.kind === ts.SyntaxKind.JSDocTypeReference;
-}
-
-/**
- * Return true if node is `JSDocOptionalType`
- * @param node A TypeScript node
- */
-export function isJSDocOptionalType(node: ts.Node): node is ts.JSDocOptionalType {
-    return node.kind === ts.SyntaxKind.JSDocOptionalType;
-}
-
-/**
- * Return true if node is `JSDocFunctionType`
- * @param node A TypeScript node
- */
-export function isJSDocFunctionType(node: ts.Node): node is ts.JSDocFunctionType {
-    return node.kind === ts.SyntaxKind.JSDocFunctionType;
-}
-
-/**
- * Return true if node is `JSDocVariadicType`
- * @param node A TypeScript node
- */
-export function isJSDocVariadicType(node: ts.Node): node is ts.JSDocVariadicType {
-    return node.kind === ts.SyntaxKind.JSDocVariadicType;
-}
-
-/**
- * Return true if node is `JSDocConstructorType`
- * @param node A TypeScript node
- */
-export function isJSDocConstructorType(node: ts.Node): node is ts.JSDocConstructorType {
-    return node.kind === ts.SyntaxKind.JSDocConstructorType;
-}
-
-/**
- * Return true if node is `JSDocThisType`
- * @param node A TypeScript node
- */
-export function isJSDocThisType(node: ts.Node): node is ts.JSDocThisType {
-    return node.kind === ts.SyntaxKind.JSDocThisType;
-}
-
-/**
- * Return true if node is `JSDocTag`
- * @param node A TypeScript node
- */
-export function isJSDocTag(node: ts.Node): node is ts.JSDocTag {
-    return node.kind === ts.SyntaxKind.JSDocTag;
-}
-
-/**
- * Return true if node is `JSDocAugmentsTag`
- * @param node A TypeScript node
- */
-export function isJSDocAugmentsTag(node: ts.Node): node is ts.JSDocAugmentsTag {
-    return node.kind === ts.SyntaxKind.JSDocAugmentsTag;
-}
-
-/**
- * Return true if node is `JSDocParameterTag`
- * @param node A TypeScript node
- */
-export function isJSDocParameterTag(node: ts.Node): node is ts.JSDocParameterTag {
-    return node.kind === ts.SyntaxKind.JSDocParameterTag;
-}
-
-/**
- * Return true if node is `JSDocReturnTag`
- * @param node A TypeScript node
- */
-export function isJSDocReturnTag(node: ts.Node): node is ts.JSDocReturnTag {
-    return node.kind === ts.SyntaxKind.JSDocReturnTag;
-}
-
-/**
- * Return true if node is `JSDocTypeTag`
- * @param node A TypeScript node
- */
-export function isJSDocTypeTag(node: ts.Node): node is ts.JSDocTypeTag {
-    return node.kind === ts.SyntaxKind.JSDocTypeTag;
-}
-
-/**
- * Return true if node is `JSDocTemplateTag`
- * @param node A TypeScript node
- */
-export function isJSDocTemplateTag(node: ts.Node): node is ts.JSDocTemplateTag {
-    return node.kind === ts.SyntaxKind.JSDocTemplateTag;
-}
-
-/**
- * Return true if node is `JSDocTypedefTag`
- * @param node A TypeScript node
- */
-export function isJSDocTypedefTag(node: ts.Node): node is ts.JSDocTypedefTag {
-    return node.kind === ts.SyntaxKind.JSDocTypedefTag;
-}
-
-/**
- * Return true if node is `JSDocPropertyTag`
- * @param node A TypeScript node
- */
-export function isJSDocPropertyTag(node: ts.Node): node is ts.JSDocPropertyTag {
-    return node.kind === ts.SyntaxKind.JSDocPropertyTag;
-}
-
-/**
- * Return true if node is `JSDocTypeLiteral`
- * @param node A TypeScript node
- */
-export function isJSDocTypeLiteral(node: ts.Node): node is ts.JSDocTypeLiteral {
-    return node.kind === ts.SyntaxKind.JSDocTypeLiteral;
-}
-
-/**
- * Return true if node is `JSDocLiteralType`
- * @param node A TypeScript node
- */
-export function isJSDocLiteralType(node: ts.Node): node is ts.JSDocLiteralType {
-    return node.kind === ts.SyntaxKind.JSDocLiteralType;
-}
-
-/**
- * Return true if node is `SyntaxList`
- * @param node A TypeScript node
- */
-export function isSyntaxList(node: ts.Node): node is ts.SyntaxList {
-    return node.kind === ts.SyntaxKind.SyntaxList;
-}
-
-/**
- * Return true if node is `NotEmittedStatement`
- * @param node A TypeScript node
- */
-export function isNotEmittedStatement(node: ts.Node): node is ts.NotEmittedStatement {
-    return node.kind === ts.SyntaxKind.NotEmittedStatement;
-}
-
-/**
- * Return true if node is `PartiallyEmittedExpression`
- * @param node A TypeScript node
- */
-export function isPartiallyEmittedExpression(node: ts.Node): node is ts.PartiallyEmittedExpression {
-    return node.kind === ts.SyntaxKind.PartiallyEmittedExpression;
-}
-
-/**
- * Return true if node is `IntersectionTypeNode`
- * @param node A TypeScript node
- */
-export function isIntersectionTypeNode(node: ts.TypeNode): node is ts.IntersectionTypeNode {
-    return node.kind === ts.SyntaxKind.IntersectionType;
-}
-
-/**
- * Return true if node is `LiteralTypeNode`
- * @param node A TypeScript node
- */
-export function isTypeLiteralNode(node: ts.TypeNode): node is ts.LiteralTypeNode {
-    return node.kind === ts.SyntaxKind.TypeLiteral;
-}
-
-/**
- * Return true if node is `GetAccessorDeclaration`
- * @param node A TypeScript node
- */
-export function isGetAccessorDeclaration(node: ts.Node): node is ts.GetAccessorDeclaration {
-    return node.kind === ts.SyntaxKind.GetAccessor;
-}
diff --git a/src/index.ts b/src/index.ts
index 5d6d524..731546f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -39,7 +39,7 @@ export const allTransforms = [
     reactRemoveStaticPropTypesMemberTransformFactoryFactory,
 ];
 
-export type TransformFactoryFactory = (typeChecker: ts.TypeChecker) => ts.TransformerFactory<ts.Node>;
+export type TransformFactoryFactory = (typeChecker: ts.TypeChecker) => ts.TransformerFactory<ts.SourceFile>;
 
 /**
  * Run React JavaScript to TypeScript transform for file at `filePath`
@@ -47,4 +47,4 @@ export type TransformFactoryFactory = (typeChecker: ts.TypeChecker) => ts.Transf
  */
 export function run(filePath: string): string {
     return compile(filePath, allTransforms);
-}
\ No newline at end of file
+}
diff --git a/src/transforms/collapse-intersection-interfaces-transform.ts b/src/transforms/collapse-intersection-interfaces-transform.ts
index f04a9d1..30395f9 100644
--- a/src/transforms/collapse-intersection-interfaces-transform.ts
+++ b/src/transforms/collapse-intersection-interfaces-transform.ts
@@ -14,7 +14,7 @@ import * as helpers from '../helpers';
  */
 export function collapseIntersectionInterfacesTransformFactoryFactory(
         typeChecker: ts.TypeChecker,
-    ): ts.TransformerFactory<ts.Node> {
+    ): ts.TransformerFactory<ts.SourceFile> {
     return function collapseIntersectionInterfacesTransformFactory(context: ts.TransformationContext) {
         return function collapseIntersectionInterfacesTransform(sourceFile: ts.SourceFile) {
             const visited = ts.visitEachChild(sourceFile, visitor, context);
@@ -23,7 +23,7 @@ export function collapseIntersectionInterfacesTransformFactoryFactory(
             return visited;
 
             function visitor(node: ts.Node) {
-                if (helpers.isTypeAliasDeclaration(node)) {
+                if (ts.isTypeAliasDeclaration(node)) {
                     return visitTypeAliasDeclaration(node);
                 }
 
@@ -32,11 +32,13 @@ export function collapseIntersectionInterfacesTransformFactoryFactory(
 
             function visitTypeAliasDeclaration(node: ts.TypeAliasDeclaration) {
                 if (
-                    helpers.isIntersectionTypeNode(node.type)
-                    && node.type.types.every((type) => helpers.isTypeLiteralNode(type))
+                    ts.isIntersectionTypeNode(node.type)
+                    && node.type.types.every(ts.isTypeLiteralNode)
                 ) {
-                    const allMembers = node.type.types
-                        .map((type: ts.TypeLiteralNode) => type.members)
+                    // We need cast `node.type.types` to `ts.NodeArray<ts.TypeLiteralNode>`
+                    // because TypeScript can't figure out `node.type.types.every(ts.isTypeLiteralNode)`
+                    const allMembers = (node.type.types as ts.NodeArray<ts.TypeLiteralNode>)
+                        .map((type) => type.members)
                         .reduce((all, members) => ts.createNodeArray(all.concat(members)), ts.createNodeArray([]));
 
                     return ts.createTypeAliasDeclaration(
diff --git a/src/transforms/react-hoist-generics-transform.ts b/src/transforms/react-hoist-generics-transform.ts
index b2aa4c3..768517c 100644
--- a/src/transforms/react-hoist-generics-transform.ts
+++ b/src/transforms/react-hoist-generics-transform.ts
@@ -1,7 +1,10 @@
 import * as ts from 'typescript';
+import * as _ from 'lodash';
 
 import * as helpers from '../helpers';
 
+export type Factory = ts.TransformerFactory<ts.SourceFile>;
+
 /**
  * Hoist generics to top of a class declarations in a React component
  *
@@ -14,7 +17,7 @@ import * as helpers from '../helpers';
  * type SomeComponentState = {bar: string;};
  * class SomeComponent extends React.Component<SomeComponentProps, SomeComponentState> {}
  */
-export function reactHoistGenericsTransformFactoryFactory(typeChecker: ts.TypeChecker): ts.TransformerFactory<ts.Node> {
+export function reactHoistGenericsTransformFactoryFactory(typeChecker: ts.TypeChecker): Factory {
     return function reactHoistGenericsTransformFactory(context: ts.TransformationContext) {
         return function reactHoistGenericsTransform(node: ts.SourceFile) {
             return visitSourceFile(node);
@@ -24,7 +27,7 @@ export function reactHoistGenericsTransformFactoryFactory(typeChecker: ts.TypeCh
     function visitSourceFile(sourceFile: ts.SourceFile) {
 
         for (const statement of sourceFile.statements) {
-            if (helpers.isClassDeclaration(statement) && helpers.isReactComponent(statement, typeChecker)) {
+            if (ts.isClassDeclaration(statement) && helpers.isReactComponent(statement, typeChecker)) {
                 return hoist(statement, sourceFile);
             }
         }
@@ -40,17 +43,17 @@ export function reactHoistGenericsTransformFactoryFactory(typeChecker: ts.TypeCh
  */
 function hoist(reactClass: ts.ClassDeclaration, sourceFile: ts.SourceFile) {
     if (!reactClass.heritageClauses) {
-        return reactClass;
+        return sourceFile;
     }
     const className = reactClass && reactClass.name && reactClass.name.getText(sourceFile);
-    const reactHeritageClauses =  helpers.find(reactClass.heritageClauses, helpers.isReactHeritageClause);
+    const reactHeritageClauses = _.find(reactClass.heritageClauses, helpers.isReactHeritageClause);
 
     if (reactHeritageClauses === undefined || !reactHeritageClauses.types == undefined) {
-        return reactClass;
+        return sourceFile;
     }
     const [reactType] = reactHeritageClauses.types;
     if (reactType.typeArguments === undefined || reactType.typeArguments.length < 2) {
-        return reactClass;
+        return sourceFile;
     }
 
     const [propType, stateType] = reactType.typeArguments;
@@ -95,7 +98,7 @@ function insertTypeRefs(
     if (reactClassDeclaration.heritageClauses === undefined) {
         return reactClassDeclaration;
     }
-    const reactHeritageClause = helpers.find(reactClassDeclaration.heritageClauses, helpers.isReactHeritageClause);
+    const reactHeritageClause = _.find(reactClassDeclaration.heritageClauses, helpers.isReactHeritageClause);
 
     if (reactHeritageClause === undefined) {
         return reactClassDeclaration;
diff --git a/src/transforms/react-js-make-props-and-state-transform.ts b/src/transforms/react-js-make-props-and-state-transform.ts
index 8f6b9f6..613c342 100644
--- a/src/transforms/react-js-make-props-and-state-transform.ts
+++ b/src/transforms/react-js-make-props-and-state-transform.ts
@@ -1,8 +1,8 @@
 import * as ts from 'typescript';
-
+import * as _ from 'lodash';
 import * as helpers from '../helpers';
 
-export type Factory = ts.TransformerFactory<ts.Node>;
+export type Factory = ts.TransformerFactory<ts.SourceFile>;
 
 /**
  * Get transform for transforming React code originally written in JS which does not have
@@ -18,291 +18,315 @@ export function reactJSMakePropsAndStateInterfaceTransformFactoryFactory(typeChe
             return visited;
 
             function visitor(node: ts.Node) {
-                if (helpers.isClassDeclaration(node)) {
-                    return visitClassDeclaration(node);
+                if (ts.isClassDeclaration(node)) {
+                    return visitClassDeclaration(node, sourceFile, typeChecker);
                 }
 
                 return node;
             }
+        }
+    }
+}
+
+function visitClassDeclaration(
+    classDeclaration: ts.ClassDeclaration,
+    sourceFile: ts.SourceFile,
+    typeChecker: ts.TypeChecker
+) {
+    if (!helpers.isReactComponent(classDeclaration, typeChecker)) {
+        return classDeclaration;
+    }
+
+    if (!classDeclaration.heritageClauses || !classDeclaration.heritageClauses.length) {
+        return classDeclaration;
+    }
+
+    const firstHeritageClause = classDeclaration.heritageClauses[0];
+
+    const newFirstHeritageClauseTypes = helpers.replaceItem(
+        firstHeritageClause.types,
+        firstHeritageClause.types[0],
+        ts.updateExpressionWithTypeArguments(
+            firstHeritageClause.types[0],
+            [
+                getPropsTypeOfReactComponentClass(classDeclaration, sourceFile),
+                getStateTypeOfReactComponentClass(classDeclaration, typeChecker),
+            ],
+            firstHeritageClause.types[0].expression,
+        ),
+    );
+
+    const newHeritageClauses = helpers.replaceItem(
+        classDeclaration.heritageClauses,
+        firstHeritageClause,
+        ts.updateHeritageClause(firstHeritageClause, newFirstHeritageClauseTypes),
+    );
+
+    return ts.updateClassDeclaration(
+        classDeclaration,
+        classDeclaration.decorators,
+        classDeclaration.modifiers,
+        classDeclaration.name,
+        classDeclaration.typeParameters,
+        newHeritageClauses,
+        classDeclaration.members,
+    );
+}
+
+function getPropsTypeOfReactComponentClass(
+    classDeclaration: ts.ClassDeclaration,
+    sourceFile: ts.SourceFile,
+): ts.TypeNode {
+    const staticPropTypesMember = _.find(classDeclaration.members, (member) => {
+        return ts.isPropertyDeclaration(member) &&
+            helpers.hasStaticModifier(member) &&
+            helpers.isPropTypesMember(member, sourceFile);
+    });
+
+    if (
+        staticPropTypesMember !== undefined
+        && ts.isPropertyDeclaration(staticPropTypesMember) // check to satisfy type checker
+        && staticPropTypesMember.initializer
+        && ts.isObjectLiteralExpression(staticPropTypesMember.initializer)
+    ) {
+        return buildInterfaceFromPropTypeObjectLiteral(staticPropTypesMember.initializer)
+    }
+
+    const staticPropTypesGetterMember = _.find(classDeclaration.members, (member) => {
+        return ts.isGetAccessorDeclaration(member) &&
+            helpers.hasStaticModifier(member) &&
+            helpers.isPropTypesMember(member, sourceFile);
+    });
+
+    if (
+        staticPropTypesGetterMember !== undefined
+        && ts.isGetAccessorDeclaration(staticPropTypesGetterMember) // check to satisfy typechecker
+    ) {
+        const returnStatement = _.find(
+            staticPropTypesGetterMember.body.statements,
+            (statement) => ts.isReturnStatement(statement),
+        );
+        if (
+            returnStatement !== undefined
+            && ts.isReturnStatement(returnStatement) // check to satisfy typechecker
+            && returnStatement.expression
+            && ts.isObjectLiteralExpression(returnStatement.expression)
+        ) {
+            return buildInterfaceFromPropTypeObjectLiteral(
+                returnStatement.expression
+            )
+        }
+    }
+
+    return ts.createTypeLiteralNode([]);
+}
+
+function getStateTypeOfReactComponentClass(
+    classDeclaration: ts.ClassDeclaration,
+    typeChecker: ts.TypeChecker,
+): ts.TypeNode {
+    const initialState = getInitialStateFromClassDeclaration(classDeclaration, typeChecker);
+    const initialStateIsVoid = initialState.kind === ts.SyntaxKind.VoidKeyword;
+    const collectedStateTypes = getStateLookingForSetStateCalls(classDeclaration, typeChecker);
+    if (!collectedStateTypes.length && initialStateIsVoid) {
+        return ts.createTypeLiteralNode([]);
+    }
+    if (!initialStateIsVoid) {
+        collectedStateTypes.push(initialState)
+    }
+
+    return ts.createUnionOrIntersectionTypeNode(ts.SyntaxKind.IntersectionType, collectedStateTypes);
+}
 
-            function visitClassDeclaration(classDeclaration: ts.ClassDeclaration) {
-                if (!helpers.isReactComponent(classDeclaration, typeChecker)) {
-                    return classDeclaration;
-                }
-
-                if (!classDeclaration.heritageClauses || !classDeclaration.heritageClauses.length) {
-                    return classDeclaration;
-                }
-
-                const firstHeritageClauses = classDeclaration.heritageClauses[0];
-                const expressionWithTypeArguments = firstHeritageClauses.types[0];
-
-                firstHeritageClauses.types[0] = ts.updateExpressionWithTypeArguments(
-                    expressionWithTypeArguments,
-                    [
-                        getPropsTypeOfReactComponentClass(classDeclaration),
-                        getStateTypeOfReactComponentClass(classDeclaration),
-                    ],
-                    expressionWithTypeArguments.expression,
-                )
-
-                return ts.updateClassDeclaration(
-                    classDeclaration,
-                    classDeclaration.decorators,
-                    classDeclaration.modifiers,
-                    classDeclaration.name,
-                    classDeclaration.typeParameters,
-                    classDeclaration.heritageClauses,
-                    classDeclaration.members,
+/**
+ * Get initial state of a React component looking for state value initially set
+ * @param classDeclaration
+ * @param typeChecker
+ */
+function getInitialStateFromClassDeclaration(
+    classDeclaration: ts.ClassDeclaration,
+    typeChecker: ts.TypeChecker,
+): ts.TypeNode {
+    // initial state class member
+
+    const initialStateMember = _.find(classDeclaration.members, (member) => {
+        try {
+            return ts.isPropertyDeclaration(member) &&
+                member.name &&
+                member.name.getText() === 'state';
+        } catch(e) {
+            return false;
+        }
+    });
+
+    if (initialStateMember
+        && ts.isPropertyDeclaration(initialStateMember)
+        && initialStateMember.initializer
+    ) {
+        const type = typeChecker.getTypeAtLocation(initialStateMember.initializer)!
+
+        return typeChecker.typeToTypeNode(type);
+    }
+
+    // Initial state in constructor
+    const constructor = _.find(
+        classDeclaration.members,
+        (member) => member.kind === ts.SyntaxKind.Constructor,
+    ) as ts.ConstructorDeclaration | undefined;
+
+    if (constructor && constructor.body) {
+        for (const statement of constructor.body.statements) {
+            if (
+                ts.isExpressionStatement(statement) &&
+                ts.isBinaryExpression(statement.expression) &&
+                statement.expression.left.getText() === 'this.state'
+            ) {
+                return typeChecker.typeToTypeNode(
+                    typeChecker.getTypeAtLocation(statement.expression.right)
                 );
-
-                function getPropsTypeOfReactComponentClass(classDeclaration: ts.ClassDeclaration): ts.TypeNode {
-                    const staticPropTypesMember = helpers.find(classDeclaration.members, (member) => {
-                        return helpers.isPropertyDeclaration(member) &&
-                            helpers.hasStaticModifier(member) &&
-                            helpers.isPropTypesMember(member, sourceFile);
-                    });
-
-                    if (
-                        staticPropTypesMember !== undefined
-                        && helpers.isPropertyDeclaration(staticPropTypesMember) // check to satisfy type checker
-                        && staticPropTypesMember.initializer
-                        && helpers.isObjectLiteralExpression(staticPropTypesMember.initializer)
-                    ) {
-                        return buildInterfaceFromPropTypeObjectLiteral(staticPropTypesMember.initializer)
-                    }
-
-                    const staticPropTypesGetterMember = helpers.find(classDeclaration.members, (member) => {
-                        return helpers.isGetAccessorDeclaration(member) &&
-                            helpers.hasStaticModifier(member) &&
-                            helpers.isPropTypesMember(member, sourceFile);
-                    });
-
-                    if (
-                        staticPropTypesGetterMember !== undefined
-                        && helpers.isGetAccessorDeclaration(staticPropTypesGetterMember) // check to satisfy typechecker
-                    ) {
-                        const returnStatement = helpers.find(
-                            staticPropTypesGetterMember.body.statements,
-                            (statement) => helpers.isReturnStatement(statement),
-                        );
-                        if (
-                            returnStatement !== undefined
-                            && helpers.isReturnStatement(returnStatement) // check to satisfy typechecker
-                            && returnStatement.expression
-                            && helpers.isObjectLiteralExpression(returnStatement.expression)
-                        ) {
-                            return buildInterfaceFromPropTypeObjectLiteral(
-                                returnStatement.expression
-                            )
-                        }
-                    }
-
-                    return ts.createTypeLiteralNode([]);
-                }
-
-                function getStateTypeOfReactComponentClass(classDeclaration: ts.ClassDeclaration): ts.TypeNode {
-                    const initialState = getInitialStateFromClassDeclaration(classDeclaration, typeChecker);
-                    const initialStateIsVoid = initialState.kind === ts.SyntaxKind.VoidKeyword;
-                    const collectedStateTypes = getStateLookingForSetStateCalls(classDeclaration, typeChecker);
-                    if (!collectedStateTypes.length && initialStateIsVoid) {
-                        return ts.createTypeLiteralNode([]);
-                    }
-                    if (!initialStateIsVoid) {
-                        collectedStateTypes.push(initialState)
-                    }
-
-                    return ts.createUnionOrIntersectionTypeNode(ts.SyntaxKind.IntersectionType, collectedStateTypes);
-                }
-            }
-
-            /**
-             * Get initial state of a React component looking for state value initially set
-             * @param classDeclaration
-             * @param typeChecker
-             */
-            function getInitialStateFromClassDeclaration(
-                classDeclaration: ts.ClassDeclaration,
-                typeChecker: ts.TypeChecker,
-            ): ts.TypeNode {
-                // initial state class member
-
-                const initialStateMember = helpers.find(classDeclaration.members, (member) => {
-                    try {
-                        return helpers.isPropertyDeclaration(member) &&
-                            member.name &&
-                            member.name.getText() === 'state';
-                    } catch(e) {
-                        return false;
-                    }
-                });
-
-                if (initialStateMember
-                    && helpers.isPropertyDeclaration(initialStateMember)
-                    && initialStateMember.initializer
-                ) {
-                    const type = typeChecker.getTypeAtLocation(initialStateMember.initializer)!
-
-                    return typeChecker.typeToTypeNode(type);
-                }
-
-                // Initial state in constructor
-                const constructor = helpers.find(
-                    classDeclaration.members,
-                    (member) => member.kind === ts.SyntaxKind.Constructor,
-                ) as ts.ConstructorDeclaration | undefined;
-
-                if (constructor && constructor.body) {
-                    for (const statement of constructor.body.statements) {
-                        if (
-                            helpers.isExpressionStatement(statement) &&
-                            helpers.isBinaryExpression(statement.expression) &&
-                            statement.expression.left.getText() === 'this.state'
-                        ) {
-                            return typeChecker.typeToTypeNode(
-                                typeChecker.getTypeAtLocation(statement.expression.right)
-                            );
-                        }
-                    }
-                }
-
-                // No initial state, fall back to void
-                return ts.createKeywordTypeNode(ts.SyntaxKind.VoidKeyword);
             }
+        }
+    }
 
-            /**
-             * Look for setState() function calls to collect the state interface in a React class component
-             * @param classDeclaration
-             * @param typeChecker
-             */
-            function getStateLookingForSetStateCalls(
-                classDeclaration: ts.ClassDeclaration,
-                typeChecker: ts.TypeChecker,
-            ): ts.TypeNode[] {
-                const typeNodes: ts.TypeNode[] = [];
-                for (const member of classDeclaration.members) {
-                    if (member && helpers.isMethodDeclaration(member) && member.body) {
-                        lookForSetState(member.body)
-                    }
-                }
+    // No initial state, fall back to void
+    return ts.createKeywordTypeNode(ts.SyntaxKind.VoidKeyword);
+}
 
-                return typeNodes;
-
-                function lookForSetState(node: ts.Node) {
-                    ts.forEachChild(node, lookForSetState)
-                    if (
-                        helpers.isExpressionStatement(node) &&
-                        helpers.isCallExpression(node.expression) &&
-                        node.expression.expression.getText().match(/setState/)
-                    ) {
-                        const type = typeChecker.getTypeAtLocation(node.expression.arguments[0])
-                        typeNodes.push(typeChecker.typeToTypeNode(type));
-                    }
-                }
-            }
+/**
+ * Look for setState() function calls to collect the state interface in a React class component
+ * @param classDeclaration
+ * @param typeChecker
+ */
+function getStateLookingForSetStateCalls(
+    classDeclaration: ts.ClassDeclaration,
+    typeChecker: ts.TypeChecker,
+): ts.TypeNode[] {
+    const typeNodes: ts.TypeNode[] = [];
+    for (const member of classDeclaration.members) {
+        if (member && ts.isMethodDeclaration(member) && member.body) {
+            lookForSetState(member.body)
+        }
+    }
+
+    return typeNodes;
+
+    function lookForSetState(node: ts.Node) {
+        ts.forEachChild(node, lookForSetState)
+        if (
+            ts.isExpressionStatement(node) &&
+            ts.isCallExpression(node.expression) &&
+            node.expression.expression.getText().match(/setState/)
+        ) {
+            const type = typeChecker.getTypeAtLocation(node.expression.arguments[0])
+            typeNodes.push(typeChecker.typeToTypeNode(type));
+        }
+    }
+}
 
-            /**
-             * Build props interface from propTypes object
-             * @example
-             * {
-             *   foo: React.PropTypes.string.isRequired
-             * }
-             *
-             * becomes
-             * {
-             *  foo: string;
-             * }
-             * @param objectLiteral
-             */
-            function buildInterfaceFromPropTypeObjectLiteral(objectLiteral: ts.ObjectLiteralExpression) {
-                const resultObjectLiteral = objectLiteral.properties.reduce(
-                    (result, propertyAssignment: ts.PropertyAssignment) => {
-                        const name = propertyAssignment.name.getText();
-                        if (!helpers.isPropertyAccessExpression(propertyAssignment.initializer)) {
-                            console.warn('Bad value for propType', name, 'at', propertyAssignment.getStart());
-                            return result;
-                        }
-
-                        // Ignore children, React types have it
-                        if (propertyAssignment.name.getText() === 'children') {
-                            return result;
-                        }
-
-                        // Ignore children, React types have it
-                        if (propertyAssignment.name.getText() === 'children') {
-                            return result;
-                        }
-
-                        const typeValue = getTypeFromReactPropTypeExpression(propertyAssignment.initializer);
-                        const isOptional = isPropTypeOptional(propertyAssignment.initializer);
-                        const propertySignature = ts.createPropertySignature(
-                            [],
-                            name,
-                            isOptional ? ts.createToken(ts.SyntaxKind.QuestionToken): undefined,
-                            typeValue,
-                            undefined,
-                        );
-                        result.members.push(propertySignature)
-                        return result;
-                }, ts.createTypeLiteralNode([]));
-
-
-                return resultObjectLiteral;
-            }
+/**
+ * Build props interface from propTypes object
+ * @example
+ * {
+ *   foo: React.PropTypes.string.isRequired
+ * }
+ *
+ * becomes
+ * {
+ *  foo: string;
+ * }
+ * @param objectLiteral
+ */
+function buildInterfaceFromPropTypeObjectLiteral(objectLiteral: ts.ObjectLiteralExpression) {
+    const members = objectLiteral.properties
+        // We only need to process PropertyAssignment:
+        // {
+        //    a: 123     // PropertyAssignment
+        // }
+        //
+        // filter out:
+        // {
+        //   a() {},     // MethodDeclaration
+        //   b,          // ShorthandPropertyAssignment
+        //   ...c,       // SpreadAssignment
+        //   get d() {}, // AccessorDeclaration
+        // }
+        .filter(ts.isPropertyAssignment)
+        .filter(property => {
+            return (
+                // Ignore children, React types have it
+                property.name.getText() !== 'children' &&
+                ts.isPropertyAccessExpression(property.initializer)
+            )
+        })
+        .map(propertyAssignment => {
+            const name = propertyAssignment.name.getText();
+            // We have guarantee this in the previous `filter`
+            const initializer = propertyAssignment.initializer as ts.PropertyAccessExpression
+            const typeValue = getTypeFromReactPropTypeExpression(initializer);
+            const isOptional = isPropTypeOptional(initializer);
+
+            return ts.createPropertySignature(
+                [],
+                name,
+                isOptional ? ts.createToken(ts.SyntaxKind.QuestionToken) : undefined,
+                typeValue,
+                undefined,
+            );
+        });
+
+        return ts.createTypeLiteralNode(members)
+}
 
-            /**
-             * Turns React.PropTypes.* into TypeScript type value
-             *
-             * @param node React propTypes value
-             */
-            function getTypeFromReactPropTypeExpression(node: ts.PropertyAccessExpression) {
-                const text = node.getText().replace(/React\.PropTypes\./, '');
-                let result = null;
-                if (/string/.test(text)) {
-                    result = ts.createKeywordTypeNode(ts.SyntaxKind.StringKeyword);
-                } else if (/any/.test(text)) {
-                    result = ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword);
-                } else if (/array/.test(text)) {
-                    result = ts.createArrayTypeNode(ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword));
-                } else if (/bool/.test(text)) {
-                    result = ts.createKeywordTypeNode(ts.SyntaxKind.BooleanKeyword);
-                } else if (/number/.test(text)) {
-                    result = ts.createKeywordTypeNode(ts.SyntaxKind.NumberKeyword);
-                } else if (/object/.test(text)) {
-                    result = ts.createKeywordTypeNode(ts.SyntaxKind.ObjectKeyword);
-                } else if (/node/.test(text)) {
-                    result = ts.createTypeReferenceNode('React.ReactNode', []);
-                } else if (/element/.test(text)) {
-                    result = ts.createTypeReferenceNode('JSX.Element', []);
-                } else if (/func/.test(text)) {
-                    const arrayOfAny = ts.createParameter(
-                        [],
-                        [],
-                        ts.createToken(ts.SyntaxKind.DotDotDotToken),
-                        'args',
-                        undefined,
-                        ts.createArrayTypeNode(ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword)),
-                        undefined,
-                    );
-                    result = ts.createFunctionTypeNode(
-                        [],
-                        [arrayOfAny],
-                        ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword),
-                    );
-                } else {
-                    result = ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword);
-                }
-                return result;
-            }
+/**
+ * Turns React.PropTypes.* into TypeScript type value
+ *
+ * @param node React propTypes value
+ */
+function getTypeFromReactPropTypeExpression(node: ts.PropertyAccessExpression) {
+    const text = node.getText().replace(/React\.PropTypes\./, '');
+    let result = null;
+    if (/string/.test(text)) {
+        result = ts.createKeywordTypeNode(ts.SyntaxKind.StringKeyword);
+    } else if (/any/.test(text)) {
+        result = ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword);
+    } else if (/array/.test(text)) {
+        result = ts.createArrayTypeNode(ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword));
+    } else if (/bool/.test(text)) {
+        result = ts.createKeywordTypeNode(ts.SyntaxKind.BooleanKeyword);
+    } else if (/number/.test(text)) {
+        result = ts.createKeywordTypeNode(ts.SyntaxKind.NumberKeyword);
+    } else if (/object/.test(text)) {
+        result = ts.createKeywordTypeNode(ts.SyntaxKind.ObjectKeyword);
+    } else if (/node/.test(text)) {
+        result = ts.createTypeReferenceNode('React.ReactNode', []);
+    } else if (/element/.test(text)) {
+        result = ts.createTypeReferenceNode('JSX.Element', []);
+    } else if (/func/.test(text)) {
+        const arrayOfAny = ts.createParameter(
+            [],
+            [],
+            ts.createToken(ts.SyntaxKind.DotDotDotToken),
+            'args',
+            undefined,
+            ts.createArrayTypeNode(ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword)),
+            undefined,
+        );
+        result = ts.createFunctionTypeNode(
+            [],
+            [arrayOfAny],
+            ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword),
+        );
+    } else {
+        result = ts.createKeywordTypeNode(ts.SyntaxKind.AnyKeyword);
+    }
+    return result;
+}
 
-            /**
-             * Decide if node is optional
-             * @param node React propTypes member node
-             */
-            function isPropTypeOptional(node: ts.PropertyAccessExpression) {
-                const text = node.getText().replace(/React\.PropTypes\./, '');
-                return !/\.isRequired/.test(text)
-            }
-        };
-    };
-};
+/**
+ * Decide if node is optional
+ * @param node React propTypes member node
+ */
+function isPropTypeOptional(node: ts.PropertyAccessExpression) {
+    const text = node.getText().replace(/React\.PropTypes\./, '');
+    return !/\.isRequired/.test(text)
+}
diff --git a/src/transforms/react-move-prop-types-to-class-transform.ts b/src/transforms/react-move-prop-types-to-class-transform.ts
index 327e011..9eae358 100644
--- a/src/transforms/react-move-prop-types-to-class-transform.ts
+++ b/src/transforms/react-move-prop-types-to-class-transform.ts
@@ -1,8 +1,9 @@
 import * as ts from 'typescript';
+import * as _ from 'lodash';
 
 import * as helpers from '../helpers';
 
-export type Factory = ts.TransformerFactory<ts.Node>;
+export type Factory = ts.TransformerFactory<ts.SourceFile>;
 
 /**
  * Move Component.propTypes statements into class as a static member of the class
@@ -56,15 +57,15 @@ function visitSourceFile(sourceFile: ts.SourceFile, typeChecker: ts.TypeChecker)
         // Look for the class declarations with the same name
         const componentName = getComponentName(propTypeAssignment, sourceFile);
 
-        const classStatement = helpers.find(
+        const classStatement = _.find(
             statements,
-            (statement) => helpers.isClassDeclaration(statement) &&
+            (statement) => ts.isClassDeclaration(statement) &&
                 statement.name !== undefined &&
                 statement.name.getText(sourceFile) === componentName,
         ) as {} as ts.ClassDeclaration; // Type weirdness
 
         // && helpers.isBinaryExpression(propTypeAssignment.expression) is redundant to satisfy the type checker
-        if (classStatement && helpers.isBinaryExpression(propTypeAssignment.expression)) {
+        if (classStatement && ts.isBinaryExpression(propTypeAssignment.expression)) {
             const newClassStatement = addStaticMemberToClass(
                 classStatement,
                 'propTypes',
diff --git a/src/transforms/react-remove-prop-types-assignment-transform.ts b/src/transforms/react-remove-prop-types-assignment-transform.ts
index f87b671..e65ecf1 100644
--- a/src/transforms/react-remove-prop-types-assignment-transform.ts
+++ b/src/transforms/react-remove-prop-types-assignment-transform.ts
@@ -2,7 +2,7 @@ import * as ts from 'typescript';
 
 import * as helpers from '../helpers';
 
-export type Factory = ts.TransformerFactory<ts.Node>;
+export type Factory = ts.TransformerFactory<ts.SourceFile>;
 
 /**
  * Remove Component.propTypes statements
diff --git a/src/transforms/react-remove-static-prop-types-member-transform.ts b/src/transforms/react-remove-static-prop-types-member-transform.ts
index 6aa579d..e0fc471 100644
--- a/src/transforms/react-remove-static-prop-types-member-transform.ts
+++ b/src/transforms/react-remove-static-prop-types-member-transform.ts
@@ -2,7 +2,7 @@ import * as ts from 'typescript';
 
 import * as helpers from '../helpers';
 
-export type Factory = ts.TransformerFactory<ts.Node>;
+export type Factory = ts.TransformerFactory<ts.SourceFile>;
 
 /**
  * Remove static propTypes
@@ -24,7 +24,7 @@ export function reactRemoveStaticPropTypesMemberTransformFactoryFactory(typeChec
             return ts.visitEachChild(sourceFile, visitor, context);
 
             function visitor(node: ts.Node) {
-                if (helpers.isClassDeclaration(node) && helpers.isReactComponent(node, typeChecker)) {
+                if (ts.isClassDeclaration(node) && helpers.isReactComponent(node, typeChecker)) {
                     return ts.updateClassDeclaration(
                         node,
                         node.decorators,
@@ -34,7 +34,7 @@ export function reactRemoveStaticPropTypesMemberTransformFactoryFactory(typeChec
                         ts.createNodeArray(node.heritageClauses),
                         node.members.filter((member) => {
                             if (
-                                helpers.isPropertyDeclaration(member)
+                                ts.isPropertyDeclaration(member)
                                 && helpers.hasStaticModifier(member)
                                 && helpers.isPropTypesMember(member, sourceFile)
                             ) {
@@ -43,7 +43,7 @@ export function reactRemoveStaticPropTypesMemberTransformFactoryFactory(typeChec
 
                             // propTypes getter
                             if (
-                                helpers.isGetAccessorDeclaration(member)
+                                ts.isGetAccessorDeclaration(member)
                                 && helpers.hasStaticModifier(member)
                                 && helpers.isPropTypesMember(member, sourceFile)
                             ) {
diff --git a/test/collapse-intersection-interfaces-transform/empty-empty/output.tsx b/test/collapse-intersection-interfaces-transform/empty-empty/output.tsx
index 579668f..ad4c7b6 100644
--- a/test/collapse-intersection-interfaces-transform/empty-empty/output.tsx
+++ b/test/collapse-intersection-interfaces-transform/empty-empty/output.tsx
@@ -1 +1,2 @@
-type Foo = {};
+type Foo = {
+};
diff --git a/test/collapse-intersection-interfaces-transform/simple/output.tsx b/test/collapse-intersection-interfaces-transform/simple/output.tsx
index b845331..97d43d9 100644
--- a/test/collapse-intersection-interfaces-transform/simple/output.tsx
+++ b/test/collapse-intersection-interfaces-transform/simple/output.tsx
@@ -1,4 +1,4 @@
 type Foo = {
     foo: string;
     bar: number;
-};
\ No newline at end of file
+};
diff --git a/test/end-to-end/basic/output.tsx b/test/end-to-end/basic/output.tsx
index c1c9a80..5dae9ae 100644
--- a/test/end-to-end/basic/output.tsx
+++ b/test/end-to-end/basic/output.tsx
@@ -1,8 +1,8 @@
 import * as React from 'react';
-
-type MyComponentProps = {};
-type MyComponentState = {};
-
+type MyComponentProps = {
+};
+type MyComponentState = {
+};
 export default class MyComponent extends React.Component<MyComponentProps, MyComponentState> {
     render() {
         return <div />;
diff --git a/test/end-to-end/initial-state-and-proprypes-and-set-state/output.tsx b/test/end-to-end/initial-state-and-proprypes-and-set-state/output.tsx
index 64338c6..b120653 100644
--- a/test/end-to-end/initial-state-and-proprypes-and-set-state/output.tsx
+++ b/test/end-to-end/initial-state-and-proprypes-and-set-state/output.tsx
@@ -1,5 +1,4 @@
 import * as React from 'react';
-
 type MyComponentProps = {
     baz: string;
 };
diff --git a/test/end-to-end/initial-state-and-proprypes/output.tsx b/test/end-to-end/initial-state-and-proprypes/output.tsx
index 4a358b2..93ed422 100644
--- a/test/end-to-end/initial-state-and-proprypes/output.tsx
+++ b/test/end-to-end/initial-state-and-proprypes/output.tsx
@@ -1,5 +1,4 @@
 import * as React from 'react';
-
 type MyComponentProps = {
     baz: string;
 };
diff --git a/test/end-to-end/non-react/output.tsx b/test/end-to-end/non-react/output.tsx
index 9111b26..2c39a54 100644
--- a/test/end-to-end/non-react/output.tsx
+++ b/test/end-to-end/non-react/output.tsx
@@ -6,4 +6,4 @@ class Foo {
 class Bar extends Foo {
     baz() {
     }
-}
\ No newline at end of file
+}
diff --git a/test/react-hoist-generics-transform/non-react/output.tsx b/test/react-hoist-generics-transform/non-react/output.tsx
index 8b8eec9..ea73175 100644
--- a/test/react-hoist-generics-transform/non-react/output.tsx
+++ b/test/react-hoist-generics-transform/non-react/output.tsx
@@ -1,18 +1,10 @@
 interface IFoo {
-
 }
 class Foo {
-
 }
-
 class Bar extends Foo {
-
 }
-
 class Foo2 implements IFoo {
-
 }
-
 class Bar2 extends Foo  implements IFoo {
-
 }
diff --git a/test/react-hoist-generics-transform/propless-stateless/output.tsx b/test/react-hoist-generics-transform/propless-stateless/output.tsx
index 22548c4..5dae9ae 100644
--- a/test/react-hoist-generics-transform/propless-stateless/output.tsx
+++ b/test/react-hoist-generics-transform/propless-stateless/output.tsx
@@ -1,7 +1,8 @@
 import * as React from 'react';
-
-type MyComponentProps = {};
-type MyComponentState = {};
+type MyComponentProps = {
+};
+type MyComponentState = {
+};
 export default class MyComponent extends React.Component<MyComponentProps, MyComponentState> {
     render() {
         return <div />;
diff --git a/test/react-hoist-generics-transform/props-and-state/output.tsx b/test/react-hoist-generics-transform/props-and-state/output.tsx
index dbebeed..a2321a1 100644
--- a/test/react-hoist-generics-transform/props-and-state/output.tsx
+++ b/test/react-hoist-generics-transform/props-and-state/output.tsx
@@ -1,5 +1,4 @@
 import * as React from 'react';
-
 type MyComponentProps = {
     foo: string;
     bar: object;
diff --git a/test/react-js-make-props-and-state-transform/non-react/output.tsx b/test/react-js-make-props-and-state-transform/non-react/output.tsx
index 8b8eec9..ea73175 100644
--- a/test/react-js-make-props-and-state-transform/non-react/output.tsx
+++ b/test/react-js-make-props-and-state-transform/non-react/output.tsx
@@ -1,18 +1,10 @@
 interface IFoo {
-
 }
 class Foo {
-
 }
-
 class Bar extends Foo {
-
 }
-
 class Foo2 implements IFoo {
-
 }
-
 class Bar2 extends Foo  implements IFoo {
-
 }
diff --git a/test/react-js-make-props-and-state-transform/propless-stateless/output.tsx b/test/react-js-make-props-and-state-transform/propless-stateless/output.tsx
index ab0d702..b2d81de 100644
--- a/test/react-js-make-props-and-state-transform/propless-stateless/output.tsx
+++ b/test/react-js-make-props-and-state-transform/propless-stateless/output.tsx
@@ -1,6 +1,7 @@
 import * as React from 'react';
-
-export default class MyComponent extends React.Component<{}, {}> {
+export default class MyComponent extends React.Component<{
+    }, {
+    }> {
     render() {
         return <div />;
     }
diff --git a/test/react-js-make-props-and-state-transform/set-state-advanced/output.tsx b/test/react-js-make-props-and-state-transform/set-state-advanced/output.tsx
index a254578..ec13c77 100644
--- a/test/react-js-make-props-and-state-transform/set-state-advanced/output.tsx
+++ b/test/react-js-make-props-and-state-transform/set-state-advanced/output.tsx
@@ -1,17 +1,15 @@
 import * as React from 'react';
-
-export default class MyComponent extends React.Component<{}, { foo: number; bar: number; } & { baz: number; } & { something: { big: number; here: string; of: { a: number; }[]; }; }> {
+export default class MyComponent extends React.Component<{
+    }, { foo: number; bar: number; } & { baz: number; } & { something: { big: number; here: string; of: { a: number; }[]; }; }> {
     render() {
         return <button onClick={this.onclick.bind(this)}/>;
     }
-
     onclick() {
         if (Math.random() > 0.5) {
             this.setState({ foo: 1, bar: 2 });
         }
         this.otherMethod();
     }
-
     otherMethod() {
         for (const foo of [1, 2, 3]) {
             if (foo > 2) {
@@ -19,7 +17,6 @@ export default class MyComponent extends React.Component<{}, { foo: number; bar:
             }
         }
     }
-
     addLargeObjectToState() {
         this.setState({
             something: {
diff --git a/test/react-js-make-props-and-state-transform/set-state-only/output.tsx b/test/react-js-make-props-and-state-transform/set-state-only/output.tsx
index 3795804..90cff71 100644
--- a/test/react-js-make-props-and-state-transform/set-state-only/output.tsx
+++ b/test/react-js-make-props-and-state-transform/set-state-only/output.tsx
@@ -1,10 +1,9 @@
 import * as React from 'react';
-
-export default class MyComponent extends React.Component<{}, { foo: number; bar: number; }> {
+export default class MyComponent extends React.Component<{
+    }, { foo: number; bar: number; }> {
     render() {
         return <button onClick={this.onclick.bind(this)}/>;
     }
-
     onclick() {
         this.setState({ foo: 1, bar: 2 });
     }
diff --git a/test/react-js-make-props-and-state-transform/state-in-class-member/output.tsx b/test/react-js-make-props-and-state-transform/state-in-class-member/output.tsx
index d9b4578..41cb58c 100644
--- a/test/react-js-make-props-and-state-transform/state-in-class-member/output.tsx
+++ b/test/react-js-make-props-and-state-transform/state-in-class-member/output.tsx
@@ -1,6 +1,6 @@
 import * as React from 'react';
-
-export default class MyComponent extends React.Component<{}, { foo: number; }> {
+export default class MyComponent extends React.Component<{
+    }, { foo: number; }> {
     state = { foo: 1 };
     render() {
         return <div />;
diff --git a/test/react-js-make-props-and-state-transform/state-in-constructor/output.tsx b/test/react-js-make-props-and-state-transform/state-in-constructor/output.tsx
index 0ee6051..0a4e1a5 100644
--- a/test/react-js-make-props-and-state-transform/state-in-constructor/output.tsx
+++ b/test/react-js-make-props-and-state-transform/state-in-constructor/output.tsx
@@ -1,11 +1,10 @@
 import * as React from 'react';
-
-export default class MyComponent extends React.Component<{}, { foo: number; }> {
+export default class MyComponent extends React.Component<{
+    }, { foo: number; }> {
     constructor(props, context) {
         super(props, context);
         this.state = { foo: 1 };
     }
-
     render() {
         return <div />;
     }
diff --git a/test/react-js-make-props-and-state-transform/static-proptypes-getter-simple/output.tsx b/test/react-js-make-props-and-state-transform/static-proptypes-getter-simple/output.tsx
index 8f1e78d..f9749a6 100644
--- a/test/react-js-make-props-and-state-transform/static-proptypes-getter-simple/output.tsx
+++ b/test/react-js-make-props-and-state-transform/static-proptypes-getter-simple/output.tsx
@@ -1,8 +1,8 @@
 import * as React from 'react';
-
 export default class MyComponent extends React.Component<{
         foo: string;
-    }, {}> {
+    }, {
+    }> {
     static get propTypes() {
         return {
             foo: React.PropTypes.string.isRequired,
diff --git a/test/react-js-make-props-and-state-transform/static-proptypes-many-props/output.tsx b/test/react-js-make-props-and-state-transform/static-proptypes-many-props/output.tsx
index ed66ed3..7df6548 100644
--- a/test/react-js-make-props-and-state-transform/static-proptypes-many-props/output.tsx
+++ b/test/react-js-make-props-and-state-transform/static-proptypes-many-props/output.tsx
@@ -1,5 +1,4 @@
 import * as React from 'react';
-
 export default class MyComponent extends React.Component<{
         any?: any;
         array?: any[];
@@ -19,7 +18,8 @@ export default class MyComponent extends React.Component<{
         stringRequired: string;
         nodeRequired: React.ReactNode;
         elementRequired: JSX.Element;
-    }, {}> {
+    }, {
+    }> {
     static propTypes = {
         children: React.PropTypes.node,
         any: React.PropTypes.any,
diff --git a/test/react-js-make-props-and-state-transform/static-proptypes-simple/output.tsx b/test/react-js-make-props-and-state-transform/static-proptypes-simple/output.tsx
index 2f06d43..817979c 100644
--- a/test/react-js-make-props-and-state-transform/static-proptypes-simple/output.tsx
+++ b/test/react-js-make-props-and-state-transform/static-proptypes-simple/output.tsx
@@ -1,8 +1,8 @@
 import * as React from 'react';
-
 export default class MyComponent extends React.Component<{
         foo: string;
-    }, {}> {
+    }, {
+    }> {
     static propTypes = {
         foo: React.PropTypes.string.isRequired,
     };
diff --git a/test/react-move-prop-types-to-class-transform/simple/output.tsx b/test/react-move-prop-types-to-class-transform/simple/output.tsx
index 005ab76..d87eb58 100644
--- a/test/react-move-prop-types-to-class-transform/simple/output.tsx
+++ b/test/react-move-prop-types-to-class-transform/simple/output.tsx
@@ -8,5 +8,4 @@ class SomeComponent extends React.Component<{
         return null;
     }
 }
-
-SomeComponent.propTypes = { foo: React.PropTypes.string };
\ No newline at end of file
+SomeComponent.propTypes = { foo: React.PropTypes.string };
diff --git a/test/react-remove-prop-types-assignment-transform/functional-components/output.tsx b/test/react-remove-prop-types-assignment-transform/functional-components/output.tsx
index b7895a4..6e4269d 100644
--- a/test/react-remove-prop-types-assignment-transform/functional-components/output.tsx
+++ b/test/react-remove-prop-types-assignment-transform/functional-components/output.tsx
@@ -1,5 +1,3 @@
 import * as React from 'react';
-
 function Foo() {
-
 }
diff --git a/test/react-remove-prop-types-assignment-transform/multiple/output.tsx b/test/react-remove-prop-types-assignment-transform/multiple/output.tsx
index 2f10f78..605714f 100644
--- a/test/react-remove-prop-types-assignment-transform/multiple/output.tsx
+++ b/test/react-remove-prop-types-assignment-transform/multiple/output.tsx
@@ -3,4 +3,4 @@ class SomeComponent extends React.Component<{
     }, {
         bar: string;
     }> {
-}
\ No newline at end of file
+}
diff --git a/test/react-remove-prop-types-assignment-transform/simple/output.tsx b/test/react-remove-prop-types-assignment-transform/simple/output.tsx
index 2f10f78..605714f 100644
--- a/test/react-remove-prop-types-assignment-transform/simple/output.tsx
+++ b/test/react-remove-prop-types-assignment-transform/simple/output.tsx
@@ -3,4 +3,4 @@ class SomeComponent extends React.Component<{
     }, {
         bar: string;
     }> {
-}
\ No newline at end of file
+}
diff --git a/test/react-remove-static-prop-types-member-transform/getter/output.tsx b/test/react-remove-static-prop-types-member-transform/getter/output.tsx
index 2f10f78..605714f 100644
--- a/test/react-remove-static-prop-types-member-transform/getter/output.tsx
+++ b/test/react-remove-static-prop-types-member-transform/getter/output.tsx
@@ -3,4 +3,4 @@ class SomeComponent extends React.Component<{
     }, {
         bar: string;
     }> {
-}
\ No newline at end of file
+}
diff --git a/test/react-remove-static-prop-types-member-transform/multiple/output.tsx b/test/react-remove-static-prop-types-member-transform/multiple/output.tsx
index 2f10f78..605714f 100644
--- a/test/react-remove-static-prop-types-member-transform/multiple/output.tsx
+++ b/test/react-remove-static-prop-types-member-transform/multiple/output.tsx
@@ -3,4 +3,4 @@ class SomeComponent extends React.Component<{
     }, {
         bar: string;
     }> {
-}
\ No newline at end of file
+}
diff --git a/test/react-remove-static-prop-types-member-transform/simple/output.tsx b/test/react-remove-static-prop-types-member-transform/simple/output.tsx
index 2f10f78..605714f 100644
--- a/test/react-remove-static-prop-types-member-transform/simple/output.tsx
+++ b/test/react-remove-static-prop-types-member-transform/simple/output.tsx
@@ -3,4 +3,4 @@ class SomeComponent extends React.Component<{
     }, {
         bar: string;
     }> {
-}
\ No newline at end of file
+}