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build/node_modules/google-closure-compiler-js/lib/webpack.js

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+/*
+ * Copyright 2016 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Webpack plugin for Closure Compiler.
+ */
+
+'use strict';
+
+function formatMessage(msg) {
+  let formatted = `(${msg.type}) ${msg.description}`;
+
+  if (msg.file && msg.lineNo >= 0) {
+    formatted = `${msg.file}:${msg.lineNo} ${formatted}`;
+  }
+
+  return formatted;
+}
+
+module.exports = function(args) {
+  const compile = require('../compile');
+  const RawSource = require('webpack-core/lib/RawSource');
+  const SourceMapSource = require('webpack-core/lib/SourceMapSource');
+
+  args.test = args && args.test ? new RegExp(args.test) : /\.js($|\?)/i;
+
+  this.apply = function(compiler) {
+    compiler.plugin('compilation', compilation => {
+      compilation.plugin('normal-module-loader', context => {
+        context.minimize = true;
+      });
+
+      compilation.plugin('optimize-chunk-assets', (chunks, callback) => {
+        chunks.forEach(chunk => {
+          const files = chunk.files.filter(name => args.test.test(name));
+          files.forEach(name => {
+            const options = args && args.options ? args.options : {};  // TODO
+
+            const asset = compilation.assets[name];
+            const sourceMap = asset.map();
+            const file = {
+              path: name,
+              src: asset.source(),
+              sourceMap: sourceMap ? JSON.stringify(sourceMap) : undefined,
+            };
+            options.jsCode = [file];
+
+            const output = compile(options);
+
+            output.errors.forEach(msg => {
+              compilation.errors.push(new Error(formatMessage(msg)));
+            });
+
+            output.warnings.forEach(msg => {
+              compilation.warnings.push(new Error(formatMessage(msg)));
+            });
+
+            if (output.errors.length > 0) {
+              return; // don't save compilation
+            }
+
+            let result;
+            if (output.sourceMap) {
+              result = new SourceMapSource(
+                output.compiledCode, name, JSON.parse(output.sourceMap), file.src, file.sourceMap);
+            } else {
+              result = new RawSource(output.compiledCode);
+            }
+            compilation.assets[name] = result;
+          });
+        });
+
+        callback();
+      });
+
+    });
+  };
+
+};