Initial CoffeeScript support (#118)

* Initial CoffeeScript support

* Minor

* Simplify CoffeeScriptAsset

.gitignore

@@ -9,4 +9,5 @@ coverage
 dist
 lib
 !test/**/node_modules
-.vscode/
+.vscode/
+.idea/

package.json

@@ -43,6 +43,7 @@
   "devDependencies": {
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.6.1",
+    "coffeescript": "^2.0.3",
     "cross-env": "^5.1.1",
     "husky": "^0.14.3",
     "less": "^2.7.2",

src/Parser.js

@@ -14,6 +14,7 @@ class Parser {
     this.registerExtension('mjs', './assets/JSAsset');
     this.registerExtension('ts', './assets/TypeScriptAsset');
     this.registerExtension('tsx', './assets/TypeScriptAsset');
+    this.registerExtension('coffee', './assets/CoffeeScriptAsset');
     this.registerExtension('json', './assets/JSONAsset');
     this.registerExtension('yaml', './assets/YAMLAsset');
     this.registerExtension('yml', './assets/YAMLAsset');

src/assets/CoffeeScriptAsset.js

@@ -0,0 +1,16 @@
+const JSAsset = require('./JSAsset');
+const config = require('../utils/config');
+const localRequire = require('../utils/localRequire');
+
+class CoffeeScriptAsset extends JSAsset {
+  async parse(code) {
+    // require coffeescript, installed locally in the app
+    let coffee = localRequire('coffeescript', this.name);
+
+    // Transpile Module using CoffeeScript and parse result as ast format through babylon
+    this.contents = coffee.compile(code, {});
+    return await super.parse(this.contents);
+  }
+}
+
+module.exports = CoffeeScriptAsset;

test/integration/coffee/index.js

@@ -0,0 +1,5 @@
+var local = require('./local.coffee');
+
+module.exports = function () {
+  return local.a + local.b.c;
+};

test/integration/coffee/local.coffee

@@ -0,0 +1,4 @@
+module.exports =
+  a: 1
+  b:
+    c: 2

test/javascript.js

@@ -234,4 +234,18 @@ describe('javascript', function() {
     assert.equal(typeof output, 'function');
     assert.equal(output(), 3);
   });
+
+  it('should support requiring CoffeeScript files', async function () {
+    let b = await bundle(__dirname + '/integration/coffee/index.js');
+
+    assertBundleTree(b, {
+      name: 'index.js',
+      assets: ['index.js', 'local.coffee'],
+      childBundles: []
+    });
+
+    let output = run(b);
+    assert.equal(typeof output, 'function');
+    assert.equal(output(), 3);
+  });
 });