fix(monorepo): fix babel options resolve

package.json

@@ -32,6 +32,7 @@
     "import"
   ],
   "dependencies": {
+    "find-babel-config": "^1.2.0",
     "pkg-up": "^2.0.0",
     "resolve": "^1.10.0"
   },

src/index.js

@@ -1,16 +1,17 @@
 const path = require('path');
 const resolve = require('resolve');
 const pkgUp = require('pkg-up');
+const findBabelConfig = require('find-babel-config');
 const { resolvePath } = require('babel-plugin-module-resolver');
 const { OptionManager } = require('@babel/core');
 
-function getPlugins(file, cwd) {
+function getPlugins(file) {
   try {
     const manager = new OptionManager();
     const result = manager.init({
       babelrc: true,
       filename: file,
-      cwd,
+      cwd: path.dirname(findBabelConfig.sync(file).file),
     });
 
     return result.plugins.filter(plugin => plugin.key === 'module-resolver');
@@ -24,8 +25,8 @@ function getPlugins(file, cwd) {
   }
 }
 
-function getPluginOptions(file, cwd, defaultOptions) {
-  const instances = getPlugins(file, cwd);
+function getPluginOptions(file, defaultOptions) {
+  const instances = getPlugins(file);
 
   return instances.reduce(
     (config, plugin) => ({
@@ -84,7 +85,6 @@ exports.resolve = (source, file, opts) => {
   try {
     const pluginOptions = getPluginOptions(
       file,
-      projectRootDir,
       {
         // if .babelrc doesn't exist, try to get the configuration information from `options`,
         // which gets defined by the eslint configuration file.

test/examples/monorepo/.babelrc

@@ -0,0 +1,10 @@
+{
+  "plugins": [
+    ["module-resolver", {
+      "alias": {
+        "Common": "./src/components/Common",
+      },
+      "cwd": "babelrc"
+    }]
+  ]
+}

test/examples/monorepo/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "monorepo",
+  "version": "0.0.0",
+  "description": "Root of monorepo",
+  "private": true,
+  "main": "index.js",
+  "scripts": {},
+  "keywords": [],
+  "author": "",
+  "license": "MIT"
+}

test/examples/monorepo/src/components/Common/Test1/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "test1",
+  "main": "Test.js",
+  "private": true
+}

test/examples/monorepo/src/components/Common/Test2/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "test2",
+  "main": "Test.js",
+  "private": true
+}

test/index.test.js

@@ -195,12 +195,22 @@ describe('eslint-import-resolver-module-resolver', () => {
   });
 
   describe('usage in a monorepo', () => {
-    it('should return `true` when mapped to a file', () => {
+    it('should return `true` when mapped to a file based on babel config in the child package', () => {
       expect(resolverPlugin.resolve('~/item', path.resolve('./test/examples/monorepo/my-lib/src/item'), extensionOpts))
         .toEqual({
           found: true,
           path: path.resolve(__dirname, './examples/monorepo/my-lib/src/item.js'),
         });
     });
+
+    it('should return `true` when mapped to a file based on root babel config', () => {
+      expect(resolverPlugin.resolve(
+        'Common/Test2', path.resolve('./test/examples/monorepo/src/components/Common/Test1'), extensionOpts,
+      ))
+        .toEqual({
+          found: true,
+          path: path.resolve(__dirname, './examples/monorepo/src/components/Common/Test2/Test.js'),
+        });
+    });
   });
 });