From 74c2e57537b5801ba17be407db9f4e6c5e03602d Mon Sep 17 00:00:00 2001
From: Jason Quense <monastic.panic@gmail.com>
Date: Tue, 26 Apr 2016 17:16:15 -0400
Subject: [PATCH] compile webpack.configs

---
 package.json                                  |  1 +
 resolvers/webpack/index.js                    | 37 +++++++++++++++++++
 resolvers/webpack/test/config.js              | 10 +++++
 .../test/files/webpack.config.babel.js        | 17 +++++++++
 4 files changed, 65 insertions(+)
 create mode 100644 resolvers/webpack/test/files/webpack.config.babel.js

diff --git a/package.json b/package.json
index 9132f7583..32316e611 100644
--- a/package.json
+++ b/package.json
@@ -71,6 +71,7 @@
     "es6-set": "^0.1.4",
     "es6-symbol": "*",
     "eslint-import-resolver-node": "^0.2.0",
+    "interpret": "^1.0.0",
     "lodash.cond": "^4.3.0",
     "lodash.endswith": "^4.0.1",
     "lodash.find": "^4.3.0",
diff --git a/resolvers/webpack/index.js b/resolvers/webpack/index.js
index a6af00baa..a8533d5cf 100644
--- a/resolvers/webpack/index.js
+++ b/resolvers/webpack/index.js
@@ -3,6 +3,7 @@ var findRoot = require('find-root')
   , resolve = require('resolve')
   , get = require('lodash.get')
   , find = require('array-find')
+  , interpret = require('interpret')
   // not available on 0.10.x
   , isAbsolute = path.isAbsolute || require('is-absolute')
 
@@ -32,6 +33,7 @@ exports.resolve = function (source, file, settings) {
 
   var configPath = get(settings, 'config', 'webpack.config.js')
     , webpackConfig
+
   try {
     // see if we've got an absolute path
     if (!isAbsolute(configPath)) {
@@ -42,7 +44,19 @@ exports.resolve = function (source, file, settings) {
       configPath = path.join(packageDir, configPath)
     }
 
+    var ext = Object.keys(interpret.extensions).reduce(function (chosen, extension) {
+      var extlen = extension.length
+      return ((configPath.substr(-extlen) === extension) && (extlen > chosen.length))
+        ? extension : chosen
+    }, '')
+
+    registerCompiler(interpret.extensions[ext])
+
     webpackConfig = require(configPath)
+    
+    if (webpackConfig && webpackConfig.default) {
+      webpackConfig = webpackConfig.default
+    }
   } catch (err) {
     webpackConfig = {}
   }
@@ -57,10 +71,12 @@ exports.resolve = function (source, file, settings) {
 
   // root as first alternate path
   var rootPath = get(webpackConfig, ['resolve', 'root'])
+
   if (rootPath) {
     if (typeof rootPath === 'string') paths.push(rootPath)
     else paths.push.apply(paths, rootPath)
   }
+
   // set fallback paths
   var fallbackPath = get(webpackConfig, ['resolve', 'fallback'])
   if (fallbackPath) {
@@ -71,6 +87,7 @@ exports.resolve = function (source, file, settings) {
 
   // otherwise, resolve "normally"
   try {
+
     return { found: true, path: resolve.sync(source, {
       basedir: path.dirname(file),
 
@@ -145,3 +162,23 @@ function packageFilter(config, pkg) {
 
   return pkg
 }
+
+
+function registerCompiler(moduleDescriptor) {
+  if(moduleDescriptor) {
+    if(typeof moduleDescriptor === 'string') {
+      require(moduleDescriptor)
+    } else if(!Array.isArray(moduleDescriptor)) {
+      moduleDescriptor.register(require(moduleDescriptor.module))
+    } else {
+      for(var i = 0; i < moduleDescriptor.length; i++) {
+        try {
+          registerCompiler(moduleDescriptor[i])
+          break
+        } catch(e) {
+          // do nothing
+        }
+      }
+    }
+  }
+}
diff --git a/resolvers/webpack/test/config.js b/resolvers/webpack/test/config.js
index 5c36071ad..5f9dcf848 100644
--- a/resolvers/webpack/test/config.js
+++ b/resolvers/webpack/test/config.js
@@ -18,4 +18,14 @@ describe("config", function () {
     expect(resolve('foo', file, absoluteSettings)).to.have.property('path')
         .and.equal(path.join(__dirname, 'files', 'some', 'absolutely', 'goofy', 'path', 'foo.js'))
   })
+
+  it("finds compile-to-js configs", function () {
+    var settings = {
+      config: path.join(__dirname, './files/webpack.config.babel.js'),
+    }
+
+    expect(resolve('main-module', file, settings))
+      .to.have.property('path')
+      .and.equal(path.join(__dirname, 'files', 'src', 'main-module.js'))
+  })
 })
diff --git a/resolvers/webpack/test/files/webpack.config.babel.js b/resolvers/webpack/test/files/webpack.config.babel.js
new file mode 100644
index 000000000..dfe585a67
--- /dev/null
+++ b/resolvers/webpack/test/files/webpack.config.babel.js
@@ -0,0 +1,17 @@
+import path from 'path'
+
+export default {
+  resolve: {
+    alias: {
+      'foo': path.join(__dirname, 'some', 'goofy', 'path', 'foo.js'),
+    },
+    modulesDirectories: ['node_modules', 'bower_components'],
+    root: path.join(__dirname, 'src'),
+    fallback: path.join(__dirname, 'fallback'),
+  },
+
+  externals: [
+    { 'jquery': 'jQuery' },
+    'bootstrap',
+  ],
+}