diff --git a/src/babel/transformation/file.js b/src/babel/transformation/file.js
index 03503beaf4..9d675fa126 100644
--- a/src/babel/transformation/file.js
+++ b/src/babel/transformation/file.js
@@ -20,12 +20,12 @@ var checkTransformerVisitor = {
   }
 };
 
-var checkNode = function (stack, node, scope) {
+function checkNode(stack, node, scope) {
   each(stack, function (pass) {
     if (pass.shouldRun) return;
     pass.checkNode(node, scope);
   });
-};
+}
 
 export default class File {
   constructor(opts) {
diff --git a/src/babel/transformation/helpers/build-react-transformer.js b/src/babel/transformation/helpers/build-react-transformer.js
index 737b680ccc..49a625ae67 100644
--- a/src/babel/transformation/helpers/build-react-transformer.js
+++ b/src/babel/transformation/helpers/build-react-transformer.js
@@ -6,7 +6,7 @@
 import isString from "lodash/lang/isString";
 import * as messages from "../../messages";
 import esutils from "esutils";
-import react from "./react";
+import * as react from "./react";
 import t from "../../types";
 
 module.exports = function (exports, opts) {
diff --git a/src/babel/transformation/helpers/define-map.js b/src/babel/transformation/helpers/define-map.js
index 850c09cf66..fdc2099ba2 100644
--- a/src/babel/transformation/helpers/define-map.js
+++ b/src/babel/transformation/helpers/define-map.js
@@ -5,7 +5,7 @@ import each from "lodash/collection/each";
 import has from "lodash/object/has";
 import t from "../../types";
 
-exports.push = function (mutatorMap, key, kind, computed, value) {
+export function push(mutatorMap, key, kind, computed, value) {
   var alias;
 
   if (t.isIdentifier(key)) {
@@ -31,9 +31,9 @@ exports.push = function (mutatorMap, key, kind, computed, value) {
   }
 
   map[kind] = value;
-};
+}
 
-exports.build = function (mutatorMap) {
+export function build(mutatorMap) {
   var objExpr = t.objectExpression([]);
 
   each(mutatorMap, function (map) {
@@ -70,4 +70,4 @@ exports.build = function (mutatorMap) {
   });
 
   return objExpr;
-};
+}
diff --git a/src/babel/transformation/helpers/name-method.js b/src/babel/transformation/helpers/name-method.js
index eb197002c2..c2a9eda26a 100644
--- a/src/babel/transformation/helpers/name-method.js
+++ b/src/babel/transformation/helpers/name-method.js
@@ -89,7 +89,7 @@ var visit = function (node, name, scope) {
   return state;
 };
 
-exports.property = function (node, file, scope) {
+export function property(node, file, scope) {
   var key = t.toComputedKey(node, node.key);
   if (!t.isLiteral(key)) return node; // we can't set a function id with this
 
@@ -99,9 +99,9 @@ exports.property = function (node, file, scope) {
   var method = node.value;
   var state  = visit(method, name, scope);
   node.value = wrap(state, method, id, scope);
-};
+}
 
-exports.bare = function (node, parent, scope) {
+export function bare(node, parent, scope) {
   // has an `id` so we don't need to infer one
   if (node.id) return;
 
@@ -123,4 +123,4 @@ exports.bare = function (node, parent, scope) {
 
   var state = visit(node, name, scope);
   return wrap(state, node, id, scope);
-};
+}
diff --git a/src/babel/transformation/helpers/react.js b/src/babel/transformation/helpers/react.js
index 87a20bd46c..a5f1f6fdf5 100644
--- a/src/babel/transformation/helpers/react.js
+++ b/src/babel/transformation/helpers/react.js
@@ -2,7 +2,7 @@ import t from "../../types";
 
 var isCreateClassCallExpression = t.buildMatchMemberExpression("React.createClass");
 
-exports.isCreateClass = function (node) {
+export function isCreateClass(node) {
   if (!node || !t.isCallExpression(node)) return false;
 
   // not React.createClass call member object
@@ -17,10 +17,10 @@ exports.isCreateClass = function (node) {
   if (!t.isObjectExpression(first)) return false;
 
   return true;
-};
+}
 
-exports.isReactComponent = t.buildMatchMemberExpression("React.Component");
+export var isReactComponent = t.buildMatchMemberExpression("React.Component");
 
-exports.isCompatTag = function (tagName) {
+export function isCompatTag(tagName) {
   return tagName && /^[a-z]|\-/.test(tagName);
-};
+}
diff --git a/src/babel/transformation/helpers/use-strict.js b/src/babel/transformation/helpers/use-strict.js
index 3c6b534ef5..a5c959fe20 100644
--- a/src/babel/transformation/helpers/use-strict.js
+++ b/src/babel/transformation/helpers/use-strict.js
@@ -1,11 +1,11 @@
 import t from "../../types";
 
-exports.has = function (node) {
+export function has(node) {
   var first = node.body[0];
   return t.isExpressionStatement(first) && t.isLiteral(first.expression, { value: "use strict" });
-};
+}
 
-exports.wrap = function (node, callback) {
+export function wrap(node, callback) {
   var useStrictNode;
   if (exports.has(node)) {
     useStrictNode = node.body.shift();
@@ -16,4 +16,4 @@ exports.wrap = function (node, callback) {
   if (useStrictNode) {
     node.body.unshift(useStrictNode);
   }
-};
+}
diff --git a/src/babel/transformation/transformers/es5/properties.mutators.js b/src/babel/transformation/transformers/es5/properties.mutators.js
index fa4fdf7b92..49811a3dc2 100644
--- a/src/babel/transformation/transformers/es5/properties.mutators.js
+++ b/src/babel/transformation/transformers/es5/properties.mutators.js
@@ -1,4 +1,4 @@
-import defineMap from "../../helpers/define-map";
+import * as defineMap from "../../helpers/define-map";
 import t from "../../../types";
 
 export function check(node) {
diff --git a/src/babel/transformation/transformers/es6/arrow-functions.js b/src/babel/transformation/transformers/es6/arrow-functions.js
index 7e7181fae9..e5cfd1db48 100644
--- a/src/babel/transformation/transformers/es6/arrow-functions.js
+++ b/src/babel/transformation/transformers/es6/arrow-functions.js
@@ -1,6 +1,6 @@
 import t from "../../../types";
 
-exports.check = t.isArrowFunctionExpression;
+export var check = t.isArrowFunctionExpression;
 
 export function ArrowFunctionExpression(node) {
   t.ensureBlock(node);
diff --git a/src/babel/transformation/transformers/es6/block-scoping-tdz.js b/src/babel/transformation/transformers/es6/block-scoping-tdz.js
index 689191800e..563923beaf 100644
--- a/src/babel/transformation/transformers/es6/block-scoping-tdz.js
+++ b/src/babel/transformation/transformers/es6/block-scoping-tdz.js
@@ -26,11 +26,9 @@ var visitor = {
   }
 };
 
-exports.optional = true;
+export var optional = true;
 
-exports.Loop =
-exports.Program =
-exports.BlockStatement = function (node, parent, scope, file) {
+export function BlockStatement(node, parent, scope, file) {
   var letRefs = node._letReferences;
   if (!letRefs) return;
 
@@ -40,4 +38,6 @@ exports.BlockStatement = function (node, parent, scope, file) {
   };
 
   scope.traverse(node, visitor, state);
-};
+}
+
+export { BlockStatement as Program, BlockStatement as Loop };
diff --git a/src/babel/transformation/transformers/es6/block-scoping.js b/src/babel/transformation/transformers/es6/block-scoping.js
index decb02090a..943f7716a0 100644
--- a/src/babel/transformation/transformers/es6/block-scoping.js
+++ b/src/babel/transformation/transformers/es6/block-scoping.js
@@ -5,11 +5,7 @@ import t from "../../../types";
 import values from "lodash/object/values";
 import extend from "lodash/object/extend";
 
-exports.check = function (node) {
-  return t.isVariableDeclaration(node) && (node.kind === "let" || node.kind === "const");
-};
-
-var isLet = function (node, parent) {
+function isLet(node, parent) {
   if (!t.isVariableDeclaration(node)) return false;
   if (node._let) return true;
   if (node.kind !== "let") return false;
@@ -25,23 +21,27 @@ var isLet = function (node, parent) {
   node._let = true;
   node.kind = "var";
   return true;
-};
+}
 
-var isLetInitable = function (node, parent) {
+function isLetInitable(node, parent) {
   return !t.isFor(parent) || !t.isFor(parent, { left: node });
-};
+}
 
-var isVar = function (node, parent) {
+function isVar(node, parent) {
   return t.isVariableDeclaration(node, { kind: "var" }) && !isLet(node, parent);
-};
+}
 
-var standardizeLets = function (declars) {
+function standardizeLets(declars) {
   for (var i = 0; i < declars.length; i++) {
     delete declars[i]._let;
   }
-};
+}
 
-exports.VariableDeclaration = function (node, parent, scope, file) {
+export function check(node) {
+  return t.isVariableDeclaration(node) && (node.kind === "let" || node.kind === "const");
+}
+
+export function VariableDeclaration(node, parent, scope, file) {
   if (!isLet(node, parent)) return;
 
   if (isLetInitable(node) && file.transformers["es6.blockScopingTDZ"].canRun()) {
@@ -61,9 +61,9 @@ exports.VariableDeclaration = function (node, parent, scope, file) {
 
     return nodes;
   }
-};
+}
 
-exports.Loop = function (node, parent, scope, file) {
+export function Loop(node, parent, scope, file) {
   var init = node.left || node.init;
   if (isLet(init, node)) {
     t.ensureBlock(node);
@@ -71,15 +71,16 @@ exports.Loop = function (node, parent, scope, file) {
   }
   var blockScoping = new BlockScoping(node, node.body, parent, scope, file);
   blockScoping.run();
-};
+}
 
-exports.Program =
-exports.BlockStatement = function (block, parent, scope, file) {
+export function BlockStatement(block, parent, scope, file) {
   if (!t.isLoop(parent)) {
     var blockScoping = new BlockScoping(false, block, parent, scope, file);
     blockScoping.run();
   }
-};
+}
+
+export { BlockStatement as Program };
 
 function replace(node, parent, scope, remaps) {
   if (!t.isReferencedIdentifier(node, parent)) return;
diff --git a/src/babel/transformation/transformers/es6/classes.js b/src/babel/transformation/transformers/es6/classes.js
index 6c5e69cb18..36224c45f0 100644
--- a/src/babel/transformation/transformers/es6/classes.js
+++ b/src/babel/transformation/transformers/es6/classes.js
@@ -1,17 +1,17 @@
 import ReplaceSupers from "../../helpers/replace-supers";
-import nameMethod from "../../helpers/name-method";
-import defineMap from "../../helpers/define-map";
+import * as nameMethod from "../../helpers/name-method";
+import * as defineMap from "../../helpers/define-map";
 import * as messages from "../../../messages";
 import * as util from  "../../../util";
 import t from "../../../types";
 
-exports.check = t.isClass;
+export var check = t.isClass;
 
-exports.ClassDeclaration = function (node, parent, scope, file) {
+export function ClassDeclaration(node, parent, scope, file) {
   return new ClassTransformer(node, file, scope, true).run();
-};
+}
 
-exports.ClassExpression = function (node, parent, scope, file) {
+export function ClassExpression(node, parent, scope, file) {
   if (!node.id) {
     if (t.isProperty(parent) && parent.value === node && !parent.computed && t.isIdentifier(parent.key)) {
       // var o = { foo: class {} };
@@ -25,7 +25,7 @@ exports.ClassExpression = function (node, parent, scope, file) {
   }
 
   return new ClassTransformer(node, file, scope, false).run();
-};
+}
 
 class ClassTransformer {
 
diff --git a/src/babel/transformation/transformers/es6/constants.js b/src/babel/transformation/transformers/es6/constants.js
index 4ffbdfe0ef..6cd1e4c95c 100644
--- a/src/babel/transformation/transformers/es6/constants.js
+++ b/src/babel/transformation/transformers/es6/constants.js
@@ -1,9 +1,9 @@
 import * as messages from "../../../messages";
 import t from "../../../types";
 
-exports.check = function (node) {
+export function check(node) {
   return t.isVariableDeclaration(node, { kind: "const" });
-};
+}
 
 var visitor = {
   enter(node, parent, scope, state) {
@@ -36,13 +36,13 @@ var visitor = {
   }
 };
 
-exports.Scopable = function (node, parent, scope, file) {
+export function Scopable(node, parent, scope, file) {
   scope.traverse(node, visitor, {
     constants: scope.getAllBindingsOfKind("const"),
     file:      file
   });
-};
+}
 
-exports.VariableDeclaration = function (node) {
+export function VariableDeclaration(node) {
   if (node.kind === "const") node.kind = "let";
-};
+}
diff --git a/src/babel/transformation/transformers/es6/destructuring.js b/src/babel/transformation/transformers/es6/destructuring.js
index c44a306d81..284df2b7aa 100644
--- a/src/babel/transformation/transformers/es6/destructuring.js
+++ b/src/babel/transformation/transformers/es6/destructuring.js
@@ -1,10 +1,9 @@
 import * as messages from "../../../messages";
 import t from "../../../types";
 
-exports.check = t.isPattern;
+export var check = t.isPattern;
 
-exports.ForInStatement =
-exports.ForOfStatement = function (node, parent, scope, file) {
+export function ForOfStatement(node, parent, scope, file) {
   var left = node.left;
 
   if (t.isPattern(left)) {
@@ -50,7 +49,9 @@ exports.ForOfStatement = function (node, parent, scope, file) {
 
   var block = node.body;
   block.body = nodes.concat(block.body);
-};
+}
+
+export { ForOfStatement as ForInStatement };
 
 exports.Function = function (node, parent, scope, file) {
   var nodes = [];
@@ -83,7 +84,7 @@ exports.Function = function (node, parent, scope, file) {
   block.body = nodes.concat(block.body);
 };
 
-exports.CatchClause = function (node, parent, scope, file) {
+export function CatchClause(node, parent, scope, file) {
   var pattern = node.param;
   if (!t.isPattern(pattern)) return;
 
@@ -103,9 +104,9 @@ exports.CatchClause = function (node, parent, scope, file) {
   node.body.body = nodes.concat(node.body.body);
 
   return node;
-};
+}
 
-exports.ExpressionStatement = function (node, parent, scope, file) {
+export function ExpressionStatement(node, parent, scope, file) {
   var expr = node.expression;
   if (expr.type !== "AssignmentExpression") return;
   if (!t.isPattern(expr.left)) return;
@@ -127,9 +128,9 @@ exports.ExpressionStatement = function (node, parent, scope, file) {
   destructuring.init(expr.left, ref);
 
   return nodes;
-};
+}
 
-exports.AssignmentExpression = function (node, parent, scope, file) {
+export function AssignmentExpression(node, parent, scope, file) {
   if (!t.isPattern(node.left)) return;
 
   var ref = scope.generateUidIdentifier("temp");
@@ -152,18 +153,18 @@ exports.AssignmentExpression = function (node, parent, scope, file) {
   nodes.push(ref);
 
   return t.toSequenceExpression(nodes, scope);
-};
+}
 
-var variableDeclarationHasPattern = function (node) {
+function variableDeclarationHasPattern(node) {
   for (var i = 0; i < node.declarations.length; i++) {
     if (t.isPattern(node.declarations[i].id)) {
       return true;
     }
   }
   return false;
-};
+}
 
-exports.VariableDeclaration = function (node, parent, scope, file) {
+export function VariableDeclaration(node, parent, scope, file) {
   if (t.isForInStatement(parent) || t.isForOfStatement(parent)) return;
   if (!variableDeclarationHasPattern(node)) return;
 
diff --git a/src/babel/transformation/transformers/es6/for-of.js b/src/babel/transformation/transformers/es6/for-of.js
index 0dcaa053bb..52cfb28f83 100644
--- a/src/babel/transformation/transformers/es6/for-of.js
+++ b/src/babel/transformation/transformers/es6/for-of.js
@@ -2,9 +2,9 @@ import * as messages from "../../../messages";
 import * as util from  "../../../util";
 import t from "../../../types";
 
-exports.check = t.isForOfStatement;
+export var check = t.isForOfStatement;
 
-exports.ForOfStatement = function (node, parent, scope, file) {
+export function ForOfStatement(node, parent, scope, file) {
   var callback = spec;
   if (file.isLoose("es6.forOf")) callback = loose;
 
@@ -33,7 +33,7 @@ exports.ForOfStatement = function (node, parent, scope, file) {
   loop._scopeInfo = node._scopeInfo;
 
   return build.node;
-};
+}
 
 var breakVisitor = {
   enter(node, parent, scope, state) {
diff --git a/src/babel/transformation/transformers/es6/parameters.rest.js b/src/babel/transformation/transformers/es6/parameters.rest.js
index 28baf52943..ab4de1b324 100644
--- a/src/babel/transformation/transformers/es6/parameters.rest.js
+++ b/src/babel/transformation/transformers/es6/parameters.rest.js
@@ -2,7 +2,7 @@ import isNumber from "lodash/lang/isNumber";
 import * as util from  "../../../util";
 import t from "../../../types";
 
-exports.check = t.isRestElement;
+export var check = t.isRestElement;
 
 var memberExpressionOptimisationVisitor = {
   enter(node, parent, scope, state) {
diff --git a/src/babel/transformation/transformers/es6/spread.js b/src/babel/transformation/transformers/es6/spread.js
index 128e41c669..f83f2de3a6 100644
--- a/src/babel/transformation/transformers/es6/spread.js
+++ b/src/babel/transformation/transformers/es6/spread.js
@@ -1,8 +1,6 @@
 import includes from "lodash/collection/includes";
 import t from "../../../types";
 
-exports.check = t.isSpreadElement;
-
 function getSpreadLiteral(spread, scope) {
   return scope.toArray(spread.argument, true);
 }
@@ -42,6 +40,8 @@ function build(props, scope) {
   return nodes;
 }
 
+export var check = t.isSpreadElement;
+
 export function ArrayExpression(node, parent, scope) {
   var elements = node.elements;
   if (!hasSpread(elements)) return;
diff --git a/src/babel/transformation/transformers/internal/alias-functions.js b/src/babel/transformation/transformers/internal/alias-functions.js
index 0bca11f8e5..45d06707cd 100644
--- a/src/babel/transformation/transformers/internal/alias-functions.js
+++ b/src/babel/transformation/transformers/internal/alias-functions.js
@@ -76,16 +76,17 @@ var go = function (getBody, node, scope) {
   }
 };
 
-exports.Program = function (node, parent, scope) {
+export function Program(node, parent, scope) {
   go(function () {
     return node.body;
   }, node, scope);
 };
 
-exports.FunctionDeclaration =
-exports.FunctionExpression = function (node, parent, scope) {
+export function FunctionDeclaration(node, parent, scope) {
   go(function () {
     t.ensureBlock(node);
     return node.body.body;
   }, node, scope);
-};
+}
+
+export { FunctionDeclaration as FunctionExpression };
diff --git a/src/babel/transformation/transformers/internal/block-hoist.js b/src/babel/transformation/transformers/internal/block-hoist.js
index a8a16c3d7c..a73c87b62b 100644
--- a/src/babel/transformation/transformers/internal/block-hoist.js
+++ b/src/babel/transformation/transformers/internal/block-hoist.js
@@ -9,8 +9,7 @@ import values from "lodash/object/values";
 //  - 2 Priority over normal nodes
 //  - 3 We want this to be at the **very** top
 
-exports.BlockStatement =
-exports.Program = {
+export var BlockStatement = {
   exit(node) {
     var hasChange = false;
     for (var i = 0; i < node.body.length; i++) {
@@ -29,3 +28,5 @@ exports.Program = {
     node.body = flatten(values(nodePriorities).reverse());
   }
 };
+
+export { BlockStatement as Program };
diff --git a/src/babel/transformation/transformers/internal/declarations.js b/src/babel/transformation/transformers/internal/declarations.js
index b6ecfcf261..26668aeeef 100644
--- a/src/babel/transformation/transformers/internal/declarations.js
+++ b/src/babel/transformation/transformers/internal/declarations.js
@@ -1,10 +1,9 @@
-import useStrict from "../../helpers/use-strict";
+import * as useStrict from "../../helpers/use-strict";
 import t from "../../../types";
 
 export var secondPass = true;
 
-exports.BlockStatement =
-exports.Program = function (node, parent, scope, file) {
+export function BlockStatement(node, parent, scope, file) {
   if (!node._declarations) return;
 
   useStrict.wrap(node, function () {
@@ -31,4 +30,6 @@ exports.Program = function (node, parent, scope, file) {
 
     node._declarations = null;
   });
-};
+}
+
+export { BlockStatement as Program };
diff --git a/src/babel/transformation/transformers/internal/module-formatter.js b/src/babel/transformation/transformers/internal/module-formatter.js
index 4355571aa2..40f236402b 100644
--- a/src/babel/transformation/transformers/internal/module-formatter.js
+++ b/src/babel/transformation/transformers/internal/module-formatter.js
@@ -1,4 +1,4 @@
-import useStrict from "../../helpers/use-strict";
+import * as useStrict from "../../helpers/use-strict";
 
 export function Program(program, parent, scope, file) {
   if (!file.transformers["es6.modules"].canRun()) return;
diff --git a/src/babel/transformation/transformers/other/react-compat.js b/src/babel/transformation/transformers/other/react-compat.js
index ca768fef07..2e20d02266 100644
--- a/src/babel/transformation/transformers/other/react-compat.js
+++ b/src/babel/transformation/transformers/other/react-compat.js
@@ -1,4 +1,4 @@
-import react from "../../helpers/react";
+import * as react from "../../helpers/react";
 import t from "../../../types";
 
 export function manipulateOptions(opts) {
diff --git a/src/babel/transformation/transformers/other/react.js b/src/babel/transformation/transformers/other/react.js
index 1ef391bc00..b74e3f3436 100644
--- a/src/babel/transformation/transformers/other/react.js
+++ b/src/babel/transformation/transformers/other/react.js
@@ -1,4 +1,4 @@
-import react from "../../helpers/react";
+import * as react from "../../helpers/react";
 import t from "../../../types";
 
 var JSX_ANNOTATION_REGEX = /^\*\s*@jsx\s+([^\s]+)/;
diff --git a/src/babel/transformation/transformers/other/use-strict.js b/src/babel/transformation/transformers/other/use-strict.js
index c0388cad02..aa2a856f24 100644
--- a/src/babel/transformation/transformers/other/use-strict.js
+++ b/src/babel/transformation/transformers/other/use-strict.js
@@ -8,10 +8,11 @@ export function Program(program) {
   }
 }
 
-exports.FunctionDeclaration =
-exports.FunctionExpression = function () {
+export function FunctionExpression() {
   this.skip();
-};
+}
+
+export { FunctionExpression as FunctionDeclaration };
 
 export function ThisExpression() {
   return t.identifier("undefined");
diff --git a/src/babel/transformation/transformers/playground/object-getter-memoization.js b/src/babel/transformation/transformers/playground/object-getter-memoization.js
index 4de270a31f..fbcf52f4ea 100644
--- a/src/babel/transformation/transformers/playground/object-getter-memoization.js
+++ b/src/babel/transformation/transformers/playground/object-getter-memoization.js
@@ -16,8 +16,7 @@ var visitor = {
   }
 };
 
-exports.Property =
-exports.MethodDefinition = function (node, parent, scope, file) {
+export function MethodDefinition(node, parent, scope, file) {
   if (node.kind !== "memo") return;
   node.kind = "get";
 
@@ -38,4 +37,6 @@ exports.MethodDefinition = function (node, parent, scope, file) {
   scope.traverse(value, visitor, state);
 
   return node;
-};
+}
+
+export { MethodDefinition as Property };
diff --git a/src/babel/transformation/transformers/validation/no-for-in-of-assignment.js b/src/babel/transformation/transformers/validation/no-for-in-of-assignment.js
index bee20b90db..57c0855af9 100644
--- a/src/babel/transformation/transformers/validation/no-for-in-of-assignment.js
+++ b/src/babel/transformation/transformers/validation/no-for-in-of-assignment.js
@@ -3,11 +3,12 @@ import t from "../../../types";
 
 export { isFor as check } from "../../../types";
 
-exports.ForInStatement =
-exports.ForOfStatement = function (node, parent, scope, file) {
+export function ForOfStatement(node, parent, scope, file) {
   var left = node.left;
   if (t.isVariableDeclaration(left)) {
     var declar = left.declarations[0];
     if (declar.init) throw file.errorWithNode(declar, messages.get("noAssignmentsInForHead"));
   }
-};
+}
+
+export { ForOfStatement as ForInStatement };
diff --git a/src/babel/transformation/transformers/validation/setters.js b/src/babel/transformation/transformers/validation/setters.js
index 64bb74ac37..a7aebb0f61 100644
--- a/src/babel/transformation/transformers/validation/setters.js
+++ b/src/babel/transformation/transformers/validation/setters.js
@@ -4,9 +4,10 @@ export function check(node) {
   return node.kind === "set";
 }
 
-exports.MethodDefinition =
-exports.Property = function (node, parent, scope, file) {
+export function Property(node, parent, scope, file) {
   if (node.kind === "set" && node.value.params.length !== 1) {
     throw file.errorWithNode(node.value, messages.get("settersInvalidParamLength"));
   }
-};
+}
+
+export { Property as MethodDefinition };