Merge pull request #78 from google/tests

mocha tests + travis CI support

.travis.yml

@@ -0,0 +1,4 @@
+language: node_js
+
+node_js:
+ - stable

README.md

@@ -1,5 +1,7 @@
 # closure-compiler-js
 
+<img src="https://travis-ci.org/google/closure-compiler-js.svg?branch=master" />
+
 Check, compile, transpile, optimize and compress JavaScript with Closure Compiler in JS.
 
 This repo tracks issues related to the publication to npmjs.org and associated plugins.
@@ -8,13 +10,14 @@ Any bugs not related to the plugins themselves should be reported to the [main r
 Unlike other packages, this allows Closure Compiler to run entirely in JS.
 *Java is not required.*
 
-This is an experimental release - meaning some features are not available and performance may not be on-par with the Java implementation. [Details Here](#transpilation)
+This is an experimental release - meaning some features are not available and performance may not be on-par with the Java implementation - [details here](#transpilation).
 
 ## Usage
 
 First, install the latest version:
 
 ```bash
+yarn add google-closure-compiler-js  # or
 npm install --save google-closure-compiler-js
 ```
 
@@ -132,9 +135,10 @@ gulp.task('script', function() {
 ### Languages
 
 The Closure Compiler supports the following languages:
-- `ECMASCRIPT3`, `ECMASCRIPT5` and `ECMASCRIPT5_STRICT` for input and output;
-- `ECMASCRIPT6` and `ECMASCRIPT6_STRICT` for input only;
--  `ECMASCRIPT6_TYPED` (experimental) for both.
+- `ECMASCRIPT3`, `ECMASCRIPT5` and `ECMASCRIPT5_STRICT`
+- `ECMASCRIPT6` and `ECMASCRIPT6_STRICT`
+- `ECMASCRIPT6_TYPED` (experimental)
+- `ECMASCRIPT_2017` (experimental)
 
 ### Source Code
 
@@ -143,7 +147,11 @@ Unless you're using Gulp's or Webpack's plugins, you'll need to specify code via
 - Using `path` you can construct a virtual filesystem for use with ES6 or CommonJS imports &mdash; although for CommonJS you'll have to set `processCommonJsModules: true`.
 
 ## Transpilation
-The JavaScript version of the Closure-Compiler is transpiled by GWT from the Java source.  For more details on the differences in behavior see the [super sourced files](https://github.com/google/closure-compiler/tree/master/src/com/google/javascript/jscomp/gwt/super) in the main repo. 
+The JavaScript version of the Closure-Compiler is transpiled by GWT from the Java source.
+For more details on the differences in behavior see the [super sourced files][1] in the main
+repository.
+
+[1]: https://github.com/google/closure-compiler/tree/master/src/com/google/javascript/jscomp/gwt/super
 
 ## Version History
 

build.js → build_compiler.js

@@ -15,6 +15,10 @@
  * limitations under the License.
  */
 
+/**
+ * @fileoverview Builds the Closure Compiler using Maven.
+ */
+
 'use strict';
 
 const spawn = require('child_process').spawnSync;
@@ -23,20 +27,21 @@ const ncp = require('ncp');
 const moduleName = 'com.google.javascript:closure-compiler-gwt';
 const compilerBuild = spawn('mvn', ['-DskipTests', '-pl', moduleName], {
   cwd: './closure-compiler',
-  stdio: 'inherit'
+  stdio: 'inherit',
 });
 
 if (compilerBuild.status !== 0) {
   throw new Error('compiler build failed');
 }
 
+const pathsToCopy = ['contrib'];
 const targetPath = './closure-compiler/target/closure-compiler-gwt-1.0-SNAPSHOT/jscomp/jscomp.js';
-ncp(targetPath, './jscomp.js', err => {
+ncp(targetPath, './jscomp.js', (err) => {
   if (err) {
     throw new Error(err);
   }
-  ['contrib'].forEach(name => {
-    ncp('./closure-compiler/' + name, './' + name, function(err) {
+  pathsToCopy.forEach((p) => {
+    ncp('./closure-compiler/' + p, './' + p, function(err) {
       if (err) {
         throw new Error(err);
       }