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Delta Between Two Patch Sets: webpack_runner.js

Issue 29549786: Issue 5535 - Replace our module system with webpack (Closed)
Left Patch Set: Created Sept. 19, 2017, 2:23 p.m.
Right Patch Set: Addressed final nits Created Oct. 10, 2017, 5:02 p.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 "use strict";
19
20 const path = require("path");
21 const process = require("process");
22
23 const MemoryFS = require("memory-fs");
24 const webpack = require("webpack");
25
26 // We read the configuration from STDIN rather than as an argument to improve
27 // the output on error. Otherwise the (fairly huge) configuration is printed
28 // along with the actual error message.
29 let inputChunks = [];
30 process.stdin.setEncoding("utf-8");
31 process.stdin.on("data", chunk => { inputChunks.push(chunk); });
32 process.stdin.on("end", () =>
33 {
34 let {bundles, extension_path,
35 info_module, resolve_paths} = JSON.parse(inputChunks.join(""));
36
37 // The contents of the info module is passed to us as a string from the Python
38 // packager and we pass it through to our custom loader now so it is available
39 // at bundle time.
40 require("./info-loader").setInfoModule(info_module);
41
42 // Since the cost of starting Node.js and loading all the modules is hugely
43 // larger than actually producing bundles we avoid paying it multiple times,
44 // instead producing all the bundles in one go.
45 let options = [];
46 for (let {bundle_name, entry_points} of bundles)
47 {
48 options.push({
49 context: extension_path,
50 devtool: "source-map",
51 module: {
52 rules: [{
53 include: path.join(__dirname, "info.js"),
54 use: ["info-loader"]
55 }]
56 },
57 entry: entry_points,
58 output: {
59 path: "/",
60 filename: bundle_name
61 },
62 resolve: {
63 modules: resolve_paths,
64 alias: {
65 // To use our custom loader for the info module we must first set up
66 // an alias to a file that exists.
67 info$: path.join(__dirname, "info.js"),
68 // Prevent builtin Node.js modules from being used instead of our own
69 // when the names clash. Once relative paths are used this won't be
70 // necessary.
71 url$: "url.js",
72 events$: "events.js",
73 punycode$: "punycode.js"
74 },
75 plugins: [
76 function()
77 {
78 // Our old module system in packagerChrome.py used to prefix
79 // module names with the name of their parent directory and an
80 // underscore - but only when that directory wasn't called
81 // "lib". This plugin is for backwards compatability, but can
82 // be removed once use of that deprecated syntax has been
83 // replaced.
84 this.plugin("described-resolve", (request, callback) =>
85 {
86 let target = request.request;
87
88 let prefixIndex = target.indexOf("_");
89 if (prefixIndex == -1)
90 return callback();
91
92 let prefix = target.substring(0, prefixIndex);
93 if (prefix == "lib")
94 return callback();
95
96 let fixedTarget = path.join(prefix,
97 target.substring(prefixIndex + 1));
98 return this.doResolve(
99 "resolve", Object.assign({}, request, {request: fixedTarget}),
100 "Changed prefixed path using legacy buildtools syntax from " +
101 target + " to " + fixedTarget,
102 callback
103 );
104 });
105 }
106 ]
107 },
108 resolveLoader: {
109 modules: [path.resolve(__dirname)]
110 }
111 });
112 }
113
114 // Based on this example
115 // https://webpack.js.org/api/node/#custom-file-systems
116 let memoryFS = new MemoryFS();
117 let webpackCompiler = webpack(options);
118
119 webpackCompiler.outputFileSystem = memoryFS;
120 webpackCompiler.run((err, stats) =>
121 {
122 // Error handling is based on this example
123 // https://webpack.js.org/api/node/#error-handling
124 if (err)
125 {
126 let reason = err.stack || err;
127 if (err.details)
128 reason += "\n" + err.details;
129 throw new Error(reason);
130 }
131 else if (stats.hasErrors())
132 throw new Error(stats.toJson().errors.join("\n"));
133 else
134 {
135 let files = {};
136
137 for (let config of options)
138 {
139 let filepath = path.join(config.output.path, config.output.filename);
140 let mappath = filepath + ".map";
141 files[filepath] = memoryFS.readFileSync(filepath, "utf-8");
142 files[mappath] = memoryFS.readFileSync(mappath, "utf-8");
143 }
144
145 console.log(JSON.stringify(files));
146 }
147 });
148 });
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