Allow 'absolute' specification of webpack config.

resolvers/webpack/index.js

@@ -27,12 +27,17 @@ exports.resolveImport = function resolveImport(source, file, settings) {
 
   var webpackConfig
   try {
-    var packageDir = findRoot(file)
-    if (!packageDir) throw new Error('package not found above ' + file)
-
-    webpackConfig = require(path.join(packageDir, get(settings, 'config', 'webpack.config.js')))
-  } catch (err) {
-    webpackConfig = {}
+    // see if we've got an absolute path
+    webpackConfig = require(get(settings, 'config', null))
+  } catch(err) {
+    try {
+      var packageDir = findRoot(file)
+      if (!packageDir) throw new Error('package not found above ' + file)
+
+      webpackConfig = require(path.join(packageDir, get(settings, 'config', 'webpack.config.js')))
+    } catch (err) {
+      webpackConfig = {}
+    }
   }
 
   // externals

resolvers/webpack/test/config.js

@@ -0,0 +1,22 @@
+var chai =  require('chai')
+  , expect = chai.expect
+
+import { resolveImport as resolve } from '../index'
+
+import path from 'path'
+
+var file = path.join(__dirname, 'files', 'src', 'jsx', 'dummy.js')
+var absoluteSettings = {
+  config: path.join(__dirname, 'files/some/absolute.path.webpack.config.js')
+}
+
+describe("config", function () {
+  it("finds webpack.config.js in parent directories", function () {
+    expect(resolve('main-module', file)).to.exist
+        .and.equal(path.join(__dirname, 'files', 'src', 'main-module.js'))
+  })
+  it("finds absolute webpack.config.js files", function () {
+    expect(resolve('foo', file, absoluteSettings)).to.exist
+        .and.equal(path.join(__dirname, 'files', 'some', 'absolutely', 'goofy', 'path', 'foo.js'))
+  })
+})

resolvers/webpack/test/files/some/absolute.path.webpack.config.js

@@ -0,0 +1,16 @@
+var path = require('path')
+
+module.exports = {
+  resolve: {
+    alias: {
+      'foo': path.join(__dirname, 'absolutely', 'goofy', 'path', 'foo.js'),
+    },
+    modulesDirectories: ['node_modules', 'bower_components'],
+    root: path.join(__dirname, 'src'),
+  },
+
+  externals: [
+    { 'jquery': 'jQuery' },
+    'bootstrap',
+  ],
+}