use external is-reference library

src/generators/Generator.ts

@@ -1,10 +1,10 @@
 import MagicString, { Bundle } from 'magic-string';
+import isReference from 'is-reference';
 import { walk, childKeys } from 'estree-walker';
 import { getLocator } from 'locate-character';
 import deindent from '../utils/deindent';
 import CodeBuilder from '../utils/CodeBuilder';
 import getCodeFrame from '../utils/getCodeFrame';
-import isReference from '../utils/isReference';
 import flattenReference from '../utils/flattenReference';
 import reservedNames from '../utils/reservedNames';
 import namespaces from '../utils/namespaces';

src/generators/dom/index.ts

@@ -1,7 +1,7 @@
 import MagicString from 'magic-string';
+import isReference from 'is-reference';
 import { parseExpressionAt } from 'acorn';
 import annotateWithScopes from '../../utils/annotateWithScopes';
-import isReference from '../../utils/isReference';
 import { walk } from 'estree-walker';
 import deindent from '../../utils/deindent';
 import { stringify, escape } from '../../utils/stringify';

src/utils/isReference.ts

@@ -1,34 +0,0 @@
-import { Node } from '../interfaces';
-
-export default function isReference(node: Node, parent: Node): boolean {
-	if (node.type === 'MemberExpression') {
-		return !node.computed && isReference(node.object, node);
-	}
-
-	if (node.type === 'Identifier') {
-		// the only time we could have an identifier node without a parent is
-		// if it's the entire body of a function without a block statement –
-		// i.e. an arrow function expression like `a => a`
-		if (!parent) return true;
-
-		// TODO is this right?
-		if (
-			parent.type === 'MemberExpression' ||
-			parent.type === 'MethodDefinition'
-		) {
-			return parent.computed || node === parent.object;
-		}
-
-		// disregard the `bar` in `{ bar: foo }`, but keep it in `{ [bar]: foo }`
-		if (parent.type === 'Property')
-			return parent.computed || node === parent.value;
-
-		// disregard the `bar` in `class Foo { bar () {...} }`
-		if (parent.type === 'MethodDefinition') return false;
-
-		// disregard the `bar` in `export { foo as bar }`
-		if (parent.type === 'ExportSpecifier' && node !== parent.local) return;
-
-		return true;
-	}
-}

src/validate/js/utils/usesThisOrArguments.ts

@@ -1,5 +1,5 @@
 import { walk } from 'estree-walker';
-import isReference from '../../../utils/isReference';
+import isReference from 'is-reference';
 import { Node } from '../../../interfaces';
 
 export default function usesThisOrArguments(node: Node) {