From 4c566845598a2129f8cf70b81f14fd7835f95111 Mon Sep 17 00:00:00 2001
From: Telokis <Telokis@users.noreply.github.com>
Date: Thu, 23 Aug 2018 23:41:42 +0200
Subject: [PATCH] fix: Escape key of alias to support using $ prefix (#313)

Closes #312

(See #312 for detailed explanation)
---
 src/normalizeOptions.js |  3 ++-
 src/utils.js            |  4 ++++
 test/index.test.js      | 10 ++++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/normalizeOptions.js b/src/normalizeOptions.js
index 5eff27e..56736b3 100644
--- a/src/normalizeOptions.js
+++ b/src/normalizeOptions.js
@@ -6,6 +6,7 @@ import findBabelConfig from 'find-babel-config';
 import glob from 'glob';
 import pkgUp from 'pkg-up';
 
+import { escapeRegExp } from './utils';
 import defaultResolvePath from './resolvePath';
 
 
@@ -79,7 +80,7 @@ function normalizeRoot(optsRoot, cwd) {
 }
 
 function getAliasTarget(key, isKeyRegExp) {
-  const regExpPattern = isKeyRegExp ? key : `^${key}(/.*|)$`;
+  const regExpPattern = isKeyRegExp ? key : `^${escapeRegExp(key)}(/.*|)$`;
   return new RegExp(regExpPattern);
 }
 
diff --git a/src/utils.js b/src/utils.js
index 062cf1c..42b107e 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -80,3 +80,7 @@ export function mapPathString(nodePath, state) {
 export function isImportCall(types, calleePath) {
   return types.isImport(calleePath.node.callee);
 }
+
+export function escapeRegExp(string) {
+  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
diff --git a/test/index.test.js b/test/index.test.js
index 8d4f683..2ee261f 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -342,6 +342,7 @@ describe('module-resolver', () => {
             '^regexp-priority': './hit',
             'regexp-priority$': './miss',
             'regexp-priority': './miss',
+            '$src': './test/testproject/src/'
           },
         }],
       ],
@@ -466,6 +467,15 @@ describe('module-resolver', () => {
       );
     });
 
+    it('should escape regexp', () => {
+      // See https://github.com/tleunen/babel-plugin-module-resolver/issues/312
+      testWithImport(
+        '$src/app',
+        './test/testproject/src/app',
+        aliasTransformerOpts,
+      );
+    })
+
     describe('with a regular expression', () => {
       it('should support replacing parts of a path', () => {
         testWithImport(