Consider also resolve.fallback while resolving modules with webpack

CHANGELOG.md

@@ -7,6 +7,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 ### Added
 - [`no-named-as-default-member`] to `warnings` canned config
 - add [`no-extraneous-dependencies`] rule ([#241], thanks [@jfmengels])
+- consider `resolve.fallback` config option in the webpack resolver ([#254])
 
 ## [1.5.0] - 2016-04-18
 ### Added
@@ -145,6 +146,7 @@ for info on changes for earlier releases.
 [`no-named-as-default-member`]: ./docs/rules/no-named-as-default-member.md
 [`no-extraneous-dependencies`]: ./docs/rules/no-extraneous-dependencies.md
 
+[#254]: https://github.com/benmosher/eslint-plugin-import/pull/254
 [#243]: https://github.com/benmosher/eslint-plugin-import/pull/243
 [#241]: https://github.com/benmosher/eslint-plugin-import/pull/241
 [#239]: https://github.com/benmosher/eslint-plugin-import/pull/239

resolvers/webpack/index.js

@@ -61,6 +61,13 @@ exports.resolve = function (source, file, settings) {
     if (typeof rootPath === 'string') paths.push(rootPath)
     else paths.push.apply(paths, rootPath)
   }
+  // set fallback paths
+  var fallbackPath = get(webpackConfig, ['resolve', 'fallback'])
+  if (fallbackPath) {
+    if (typeof fallbackPath === 'string') paths.push(fallbackPath)
+    else paths.push.apply(paths, fallbackPath)
+  }
+
 
   // otherwise, resolve "normally"
   try {

resolvers/webpack/test/fallback.js

@@ -0,0 +1,28 @@
+var chai =  require('chai')
+  , expect = chai.expect
+  , path = require('path')
+
+var resolve = require('../index').resolve
+
+
+var file = path.join(__dirname, 'files', 'src', 'dummy.js')
+
+describe("fallback", function () {
+  it("works", function () {
+    expect(resolve('fb-module', file)).property('path')
+      .to.equal(path.join(__dirname, 'files', 'fallback', 'fb-module.js'))
+  })
+  it("really works", function () {
+    expect(resolve('jsx/some-fb-file', file)).property('path')
+      .to.equal(path.join(__dirname, 'files', 'fallback', 'jsx', 'some-fb-file.js'))
+  })
+  it("prefer root", function () {
+    expect(resolve('jsx/some-file', file)).property('path')
+      .to.equal(path.join(__dirname, 'files', 'src', 'jsx', 'some-file.js'))
+  })
+  it("supports definition as an array", function () {
+    expect(resolve('fb-module', file, { config: "webpack.array-root.config.js" }))
+      .property('path')
+      .to.equal(path.join(__dirname, 'files', 'fallback', 'fb-module.js'))
+  })
+})

resolvers/webpack/test/files/webpack.array-root.config.js

@@ -4,4 +4,8 @@ exports.resolve = {
     path.join(__dirname, 'src'),
     path.join(__dirname, 'bower_components'),
   ],
+  fallback: [
+    path.join(__dirname, 'fallback'),
+    path.join(__dirname, 'bower_components'),
+  ],
 }

resolvers/webpack/test/files/webpack.config.js

@@ -7,6 +7,7 @@ module.exports = {
     },
     modulesDirectories: ['node_modules', 'bower_components'],
     root: path.join(__dirname, 'src'),
+    fallback: path.join(__dirname, 'fallback'),
   },
 
   externals: [