Add JSON5 support (#695)

Author: aicest

src/Parser.js

@@ -18,6 +18,7 @@ class Parser {
     this.registerExtension('tsx', './assets/TypeScriptAsset');
     this.registerExtension('coffee', './assets/CoffeeScriptAsset');
     this.registerExtension('json', './assets/JSONAsset');
+    this.registerExtension('json5', './assets/JSONAsset');
     this.registerExtension('yaml', './assets/YAMLAsset');
     this.registerExtension('yml', './assets/YAMLAsset');
     this.registerExtension('gql', './assets/GraphqlAsset');

src/assets/JSONAsset.js

@@ -1,4 +1,6 @@
 const Asset = require('../Asset');
+const path = require('path');
+const json5 = require('json5');
 const {minify} = require('uglify-es');
 
 class JSONAsset extends Asset {
@@ -7,8 +9,14 @@ class JSONAsset extends Asset {
     this.type = 'js';
   }
 
+  parse(code) {
+    return path.extname(this.name) === '.json5' ? json5.parse(code) : null;
+  }
+
   generate() {
-    let code = `module.exports = ${this.contents};`;
+    let code = `module.exports = ${
+      this.ast ? JSON.stringify(this.ast, null, 2) : this.contents
+    };`;
 
     if (this.options.minify) {
       let minified = minify(code);

test/integration/json5/index.js

@@ -0,0 +1,5 @@
+var local = require('./local.json5');
+
+module.exports = function () {
+  return local.a + local.b;
+};

test/integration/json5/local.json5

@@ -0,0 +1,8 @@
+/*
+ * comment
+ */
+{
+  a: 1, // comment
+  b: 2,
+}
+/* end */

test/integration/uglify-json5/index.json5

@@ -0,0 +1,7 @@
+/*
+ * comment
+ */
+{
+  "test": "test", // comment
+}
+/* end */

test/javascript.js

@@ -211,6 +211,24 @@ describe('javascript', function() {
     assert.equal(output(), 3);
   });
 
+  it('should support requiring JSON5 files', async function() {
+    let b = await bundle(__dirname + '/integration/json5/index.js');
+
+    assertBundleTree(b, {
+      name: 'index.js',
+      assets: ['index.js', 'local.json5'],
+      childBundles: [
+        {
+          type: 'map'
+        }
+      ]
+    });
+
+    let output = run(b);
+    assert.equal(typeof output, 'function');
+    assert.equal(output(), 3);
+  });
+
   it('should support importing a URL to a raw asset', async function() {
     let b = await bundle(__dirname + '/integration/import-raw/index.js');
 
@@ -480,6 +498,15 @@ describe('javascript', function() {
     });
 
     let json = fs.readFileSync(__dirname + '/dist/index.js', 'utf8');
-    assert(json.includes('test:"test"'));
+    assert(json.includes('{test:"test"}'));
+  });
+
+  it('should minify JSON5 files', async function() {
+    await bundle(__dirname + '/integration/uglify-json5/index.json5', {
+      production: true
+    });
+
+    let json = fs.readFileSync(__dirname + '/dist/index.js', 'utf8');
+    assert(json.includes('{test:"test"}'));
   });
 });