refactor(@angular/cli): remove compression plugin (#4702)

Followup from #4618

package.json

@@ -43,7 +43,6 @@
     "@angular/compiler-cli": "^2.3.1",
     "@angular/core": "^2.3.1",
     "@angular/tsc-wrapped": "^0.5.0",
-    "async": "^2.1.4",
     "autoprefixer": "^6.5.3",
     "chalk": "^1.1.3",
     "common-tags": "^1.3.1",
@@ -103,7 +102,6 @@
     "webpack": "~2.2.0",
     "webpack-dev-server": "~2.2.0",
     "webpack-merge": "^2.4.0",
-    "webpack-sources": "^0.1.3",
     "zone.js": "^0.7.2"
   },
   "ember-addon": {

packages/@angular/cli/lib/webpack/compression-plugin.ts

@@ -1,112 +0,0 @@
-/** Forked from https://github.com/webpack/compression-webpack-plugin. */
-const async = require('async');
-const url = require('url');
-
-const RawSource = require('webpack-sources/lib/RawSource');
-
-
-export interface CompressionPluginOptions {
-  algorithm?: string;
-  asset?: string;
-  level?: number;
-  flush?: boolean;
-  chunkSize?: number;
-  test?: RegExp | RegExp[];
-  windowBits?: number;
-  memLevel?: number;
-  strategy?: number;
-  dictionary?: any;
-  threshold?: number;
-  minRatio?: number;
-}
-
-
-export class CompressionPlugin {
-  private asset = '[path].gz[query]';
-  private algorithm: Function;
-  private compressionOptions: any = {};
-  private test: RegExp[];
-  private threshold = 0;
-  private minRatio = 0.8;
-
-  constructor(options: CompressionPluginOptions = {}) {
-    if (options.hasOwnProperty('asset')) {
-      this.asset = options.asset;
-    }
-
-    const algorithm = options.hasOwnProperty('algorithm') ? options.algorithm : 'gzip';
-
-    const zlib = require('zlib');
-
-    this.compressionOptions = {};
-    this.algorithm = zlib[algorithm];
-    if (!this.algorithm) {
-      throw new Error(`Algorithm not found in zlib: "${algorithm}".`);
-    }
-
-    this.compressionOptions = {
-      level: options.level || 9,
-      flush: options.flush,
-      chunkSize: options.chunkSize,
-      windowBits: options.windowBits,
-      memLevel: options.memLevel,
-      strategy: options.strategy,
-      dictionary: options.dictionary
-    };
-
-    if (options.hasOwnProperty('test')) {
-      if (Array.isArray(options.test)) {
-        this.test = options.test as RegExp[];
-      } else {
-        this.test = [options.test as RegExp];
-      }
-    }
-    if (options.hasOwnProperty('threshold')) {
-      this.threshold = options.threshold;
-    }
-    if (options.hasOwnProperty('minRatio')) {
-      this.minRatio = options.minRatio;
-    }
-  }
-
-  apply(compiler: any) {
-    compiler.plugin('this-compilation', (compilation: any) => {
-      compilation.plugin('optimize-assets', (assets: any, callback: Function) => {
-        async.forEach(Object.keys(assets), (file: string, callback: Function) => {
-          if (this.test.every((t) => !t.test(file))) {
-            return callback();
-          }
-
-          const asset = assets[file];
-          let content = asset.source();
-          if (!Buffer.isBuffer(content)) {
-            content = new Buffer(content, 'utf-8');
-          }
-
-          const originalSize = content.length;
-          if (originalSize < this.threshold) {
-            return callback();
-          }
-
-          this.algorithm(content, this.compressionOptions, (err: Error, result: string) => {
-            if (err) {
-              return callback(err);
-            }
-            if (result.length / originalSize > this.minRatio) {
-              return callback();
-            }
-
-            const parse = url.parse(file);
-            const newFile = this.asset
-              .replace(/\[file]/g, file)
-              .replace(/\[path]/g, parse.pathname)
-              .replace(/\[query]/g, parse.query || '');
-
-            assets[newFile] = new RawSource(result);
-            callback();
-          });
-        }, callback);
-      });
-    });
-  }
-}

packages/@angular/cli/models/webpack-configs/production.ts

@@ -4,7 +4,6 @@ import * as fs from 'fs';
 import { stripIndent } from 'common-tags';
 import { StaticAssetPlugin } from '../../plugins/static-asset';
 import { GlobCopyWebpackPlugin } from '../../plugins/glob-copy-webpack-plugin';
-import { CompressionPlugin } from '../../lib/webpack/compression-plugin';
 import { WebpackConfigOptions } from '../webpack-config';
 
 
@@ -75,12 +74,6 @@ export const getProdConfig = function (wco: WebpackConfigOptions) {
         mangle: { screw_ie8: true },
         compress: { screw_ie8: true, warnings: buildOptions.verbose },
         sourceMap: buildOptions.sourcemap
-      }),
-      new CompressionPlugin({
-        asset: '[path].gz[query]',
-        algorithm: 'gzip',
-        test: /\.js$|\.html$|\.css$/,
-        threshold: 10240
       })
     ].concat(extraPlugins)
   };

packages/@angular/cli/package.json

@@ -28,7 +28,6 @@
   "dependencies": {
     "@ngtools/json-schema": "1.0.3",
     "@ngtools/webpack": "1.2.9",
-    "async": "^2.1.4",
     "autoprefixer": "^6.5.3",
     "chalk": "^1.1.3",
     "common-tags": "^1.3.1",
@@ -84,7 +83,6 @@
     "webpack": "~2.2.0",
     "webpack-dev-server": "~2.2.0",
     "webpack-merge": "^2.4.0",
-    "webpack-sources": "^0.1.3",
     "zone.js": "^0.7.2"
   },
   "ember-addon": {