Add option babelifyDeps (#422)

README.md

@@ -306,7 +306,7 @@ includes IE11. And if you have different opinions on which browsers to use,
 Bankai respects `.babelrc` and [`.browserslistrc`](https://github.com/ai/browserslist) files.
 
 Some newer JavaScript features require loading an extra library; `async/await`
-being the clearest example. To enable this features, the `babel-polyfill`
+being the clearest example. To enable such features, the `babel-polyfill`
 library needs to be included in your application's root (e.g. `index.js`).
 
 ```js
@@ -333,6 +333,7 @@ argument. The following options are available:
   if you have your own logging system.
 - __opts.watch:__ Defaults to `true`. Watch for changes in the source files and
   rebuild. Set to `false` to get optimized bundles.
+- __babelifyDeps:__ Defaults to true. Transform dependencies with babelify.
 
 ### `compiler.documents(routename, [opts], done(err, { buffer, hash }))`
 Output an HTML bundle for a route. Routes are determined based on the project's

index.js

@@ -106,6 +106,7 @@ function Bankai (entry, opts) {
   this.graph.start({
     dirname: this.dirname,
     watch: opts.watch !== false,
+    babelifyDeps: opts.babelifyDeps !== false,
     fullPaths: opts.fullPaths,
     reload: Boolean(opts.reload),
     log: this.log,

lib/graph-script.js

@@ -64,12 +64,14 @@ function node (state, createEdge) {
   b.ignore('sheetify/insert')
   b.transform(sheetify)
   b.transform(glslify)
-  // Dependencies should be transformed, but their .babelrc should be ignored.
-  b.transform(tfilter(babelify, { include: /node_modules/ }), {
-    global: true,
-    babelrc: false,
-    presets: babelPresets
-  })
+  if (state.metadata.babelifyDeps) {
+    // Dependencies should be transformed, but their .babelrc should be ignored.
+    b.transform(tfilter(babelify, { include: /node_modules/ }), {
+      global: true,
+      babelrc: false,
+      presets: babelPresets
+    })
+  }
   // In our own code, .babelrc files should be used.
   b.transform(tfilter(babelify, { exclude: /node_modules/ }), {
     global: true,

package.json

@@ -90,6 +90,7 @@
     "rimraf": "^2.6.2",
     "standard": "^11.0",
     "tachyons": "^4.9.1",
-    "tape": "^4.8.0"
+    "tape": "^4.8.0",
+    "tmp": "0.0.33"
   }
 }

test/script.js

@@ -5,6 +5,7 @@ var path = require('path')
 var tape = require('tape')
 var fs = require('fs')
 var os = require('os')
+var tmp = require('tmp')
 
 var bankai = require('../')
 
@@ -128,6 +129,41 @@ tape('use custom babel config for local files, but not for dependencies', functi
   })
 })
 
+tape('skip babel for dependencies if babelifyDeps is false', function (assert) {
+  assert.plan(4)
+  var file = dedent`
+    const depFunc = require('mydep').depFunc
+    depFunc(1)
+  `
+  var depFile = dedent`
+    const depFunc = (arg) => {
+      console.log(arg)
+    }
+    module.exports = {
+      depFunc
+    }
+`
+
+  var filename = 'js-pipeline-' + (Math.random() * 1e4).toFixed() + '.js'
+  const outputDir = tmp.dirSync({unsafeCleanup: true})
+  var tmpFilename = path.join(outputDir.name, filename)
+  fs.writeFileSync(tmpFilename, file)
+  const nodeModulesDir = path.join(outputDir.name, 'node_modules')
+  mkdirp.sync(nodeModulesDir)
+  fs.writeFileSync(path.join(nodeModulesDir, 'mydep.js'), depFile)
+
+  var compiler = bankai(tmpFilename, { watch: false, babelifyDeps: false })
+  compiler.scripts('bundle.js', function (err, node) {
+    assert.error(err, 'no error writing script')
+    assert.ok(node, 'output exists')
+    assert.ok(node.buffer, 'output buffer exists')
+
+    const compiledJs = node.buffer.toString('utf8')
+    assert.notOk(/['"]use strict['"]/.test(compiledJs))
+    outputDir.removeCallback()
+  })
+})
+
 tape('use custom browserslist config', function (assert) {
   assert.plan(5)