bind function expression ids to the child scope (#1083)

src/ast/nodes/FunctionExpression.js

@@ -1,12 +1,29 @@
 import Node from '../Node.js';
 
 export default class FunctionExpression extends Node {
+	activate () {
+		if ( this.activated ) return;
+		this.activated = true;
+
+		const scope = this.body.scope;
+		this.params.forEach( param => param.run( scope ) ); // in case of assignment patterns
+		this.body.run();
+	}
+
+	addReference () {
+		/* noop? */
+	}
+
 	bind () {
 		if ( this.id ) this.id.bind( this.body.scope );
 		this.params.forEach( param => param.bind( this.body.scope ) );
 		this.body.bind();
 	}
 
+	getName () {
+		return this.id && this.id.name;
+	}
+
 	hasEffects () {
 		return false;
 	}
@@ -14,7 +31,11 @@ export default class FunctionExpression extends Node {
 	initialise ( scope ) {
 		this.body.createScope( scope );
 
-		if ( this.id ) this.id.initialise( this.body.scope );
+		if ( this.id ) {
+			this.id.initialise( this.body.scope );
+			this.body.scope.addDeclaration( this.id.name, this, false, false );
+		}
+
 		this.params.forEach( param => param.initialise( this.body.scope ) );
 		this.body.initialise();
 	}

test/function/preserves-function-expression-names/_config.js

@@ -0,0 +1,11 @@
+const assert = require( 'assert' );
+
+module.exports = {
+	description: 'does not rewrite function expression names incorrectly (#1083)',
+	options: {
+		external: [ 'path' ]
+	},
+	exports ( exports ) {
+		assert.equal( exports.x.name, 'basename' );
+	}
+};

test/function/preserves-function-expression-names/main.js

@@ -0,0 +1,5 @@
+import { basename } from 'path';
+
+var x = function basename () {};
+
+export { x };