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webpack.generated.js
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webpack.generated.js
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/**
* NOTICE: this is an auto-generated file
*
* This file has been generated by the `flow:prepare-frontend` maven goal.
* This file will be overwritten on every run. Any custom changes should be made to webpack.config.js
*/
const fs = require('fs');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const CompressionPlugin = require('compression-webpack-plugin');
const {BabelMultiTargetPlugin} = require('webpack-babel-multi-target-plugin');
const path = require('path');
const baseDir = path.resolve(__dirname);
// the folder of app resources (main.js and flow templates)
const frontendFolder = require('path').resolve(__dirname, 'frontend');
const fileNameOfTheFlowGeneratedMainEntryPoint = require('path').resolve(__dirname, 'target/frontend/generated-flow-imports.js');
const mavenOutputFolderForFlowBundledFiles = require('path').resolve(__dirname, 'target/classes/META-INF/VAADIN');
// public path for resources, must match Flow VAADIN_BUILD
const build = 'build';
// public path for resources, must match the request used in flow to get the /build/stats.json file
const config = 'config';
// folder for outputting index.js bundle, etc.
const buildFolder = `${mavenOutputFolderForFlowBundledFiles}/${build}`;
// folder for outputting stats.json
const confFolder = `${mavenOutputFolderForFlowBundledFiles}/${config}`;
// file which is used by flow to read templates for server `@Id` binding
const statsFile = `${confFolder}/stats.json`;
// make sure that build folder exists before outputting anything
const mkdirp = require('mkdirp');
const devMode = process.argv.find(v => v.indexOf('webpack-dev-server') >= 0);
!devMode && mkdirp(buildFolder);
mkdirp(confFolder);
let stats;
const watchDogPrefix = '--watchDogPort=';
let watchDogPort = process.argv.find(v => v.indexOf(watchDogPrefix) >= 0);
if (watchDogPort) {
watchDogPort = watchDogPort.substr(watchDogPrefix.length);
}
const transpile = !devMode || process.argv.find(v => v.indexOf('--transpile-es5') >= 0);
const net = require('net');
function setupWatchDog() {
var client = new net.Socket();
client.connect(watchDogPort, 'localhost');
client.on('error', function () {
console.log("Watchdog connection error. Terminating webpack process...");
client.destroy();
process.exit(0);
});
client.on('close', function () {
client.destroy();
setupWatchDog();
});
}
if (watchDogPort) {
setupWatchDog();
}
exports = {
frontendFolder: `${frontendFolder}`,
buildFolder: `${buildFolder}`,
confFolder: `${confFolder}`
};
module.exports = {
mode: 'production',
context: frontendFolder,
entry: {
bundle: fileNameOfTheFlowGeneratedMainEntryPoint
},
output: {
filename: `${build}/vaadin-[name]-[contenthash].cache.js`,
path: mavenOutputFolderForFlowBundledFiles,
publicPath: 'VAADIN/',
},
resolve: {
alias: {
Frontend: frontendFolder
}
},
devServer: {
// webpack-dev-server serves ./ , webpack-generated, and java webapp
contentBase: [mavenOutputFolderForFlowBundledFiles, 'src/main/webapp'],
after: function (app, server) {
app.get(`/stats.json`, function (req, res) {
res.json(stats);
});
app.get(`/stats.hash`, function (req, res) {
res.json(stats.hash.toString());
});
app.get(`/assetsByChunkName`, function (req, res) {
res.json(stats.assetsByChunkName);
});
app.get(`/stop`, function (req, res) {
// eslint-disable-next-line no-console
console.log("Stopped 'webpack-dev-server'");
process.exit(0);
});
}
},
module: {
rules: [
...(transpile ? [{ // Files that Babel has to transpile
test: /\.js$/,
use: [BabelMultiTargetPlugin.loader()]
}] : []),
{
test: /\.css$/i,
use: ['raw-loader']
}
]
},
performance: {
maxEntrypointSize: 2097152, // 2MB
maxAssetSize: 2097152 // 2MB
},
plugins: [
// Generate compressed bundles when not devMode
...(devMode ? [] : [new CompressionPlugin()]),
// Transpile with babel, and produce different bundles per browser
...(transpile ? [new BabelMultiTargetPlugin({
babel: {
plugins: [
// workaround for Safari 10 scope issue (https://bugs.webkit.org/show_bug.cgi?id=159270)
"@babel/plugin-transform-block-scoping",
// Edge does not support spread '...' syntax in object literals (#7321)
"@babel/plugin-proposal-object-rest-spread"
],
presetOptions: {
useBuiltIns: false // polyfills are provided from webcomponents-loader.js
}
},
targets: {
'es6': { // Evergreen browsers
browsers: [
// It guarantees that babel outputs pure es6 in bundle and in stats.json
// In the case of browsers no supporting certain feature it will be
// covered by the webcomponents-loader.js
'last 1 Chrome major versions'
],
},
'es5': { // IE11
browsers: [
'ie 11'
],
tagAssetsWithKey: true, // append a suffix to the file name
}
}
})] : []),
// Generates the stats file for flow `@Id` binding.
function (compiler) {
compiler.hooks.afterEmit.tapAsync("FlowIdPlugin", (compilation, done) => {
let statsJson = compilation.getStats().toJson();
// Get bundles as accepted keys (except any es5 bundle)
let acceptedKeys = statsJson.assets.filter(asset => asset.chunks.length > 0 && !asset.chunkNames.toString().includes("es5"))
.map(asset => asset.chunks).reduce((acc, val) => acc.concat(val), []);
// Collect all modules for the given keys
const modules = collectModules(statsJson, acceptedKeys);
// Collect accepted chunks and their modules
const chunks = collectChunks(statsJson, acceptedKeys);
let customStats = {
hash: statsJson.hash,
assetsByChunkName: statsJson.assetsByChunkName,
chunks: chunks,
modules: modules
};
if (!devMode) {
// eslint-disable-next-line no-console
console.log(" Emitted " + statsFile);
fs.writeFile(statsFile, JSON.stringify(customStats, null, 1), done);
} else {
// eslint-disable-next-line no-console
console.log(" Serving the 'stats.json' file dynamically.");
stats = customStats;
done();
}
});
},
// Copy webcomponents polyfills. They are not bundled because they
// have its own loader based on browser quirks.
new CopyWebpackPlugin([{
from: `${baseDir}/node_modules/@webcomponents/webcomponentsjs`,
to: `${build}/webcomponentsjs/`
}]),
]
};
/**
* Collect chunk data for accepted chunk ids.
* @param statsJson full stats.json content
* @param acceptedKeys chunk ids that are accepted
* @returns slimmed down chunks
*/
function collectChunks(statsJson, acceptedChunks) {
const chunks = [];
// only handle chunks if they exist for stats
if (statsJson.chunks) {
statsJson.chunks.forEach(function (chunk) {
// Acc chunk if chunk id is in accepted chunks
if (acceptedChunks.includes(chunk.id)) {
const modules = [];
// Add all modules for chunk as slimmed down modules
chunk.modules.forEach(function (module) {
const slimModule = {
id: module.id,
name: module.name,
source: module.source,
};
modules.push(slimModule);
});
const slimChunk = {
id: chunk.id,
names: chunk.names,
files: chunk.files,
hash: chunk.hash,
modules: modules
}
chunks.push(slimChunk);
}
});
}
return chunks;
}
/**
* Collect all modules that are for a chunk in acceptedChunks.
* @param statsJson full stats.json
* @param acceptedChunks chunk names that are accepted for modules
* @returns slimmed down modules
*/
function collectModules(statsJson, acceptedChunks) {
let modules = [];
// skip if no modules defined
if (statsJson.modules) {
statsJson.modules.forEach(function (module) {
// Add module if module chunks contain an accepted chunk and the module is generated-flow-imports.js module
if (module.chunks.filter(key => acceptedChunks.includes(key)).length > 0
&& (module.name.includes("generated-flow-imports.js") || module.name.includes("generated-flow-imports-fallback.js"))) {
let subModules = [];
// Create sub modules only if they are available
if (module.modules) {
module.modules.filter(module => !module.name.includes("es5")).forEach(function (module) {
const subModule = {
name: module.name,
source: module.source
};
subModules.push(subModule);
});
}
const slimModule = {
id: module.id,
name: module.name,
source: module.source,
modules: subModules
};
modules.push(slimModule);
}
});
}
return modules;
}