'use strict';
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const htmlWebpackPlugin = require('html-webpack-plugin');
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const { EVENT, PLUGIN } = require('./constants.js');
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const debug = require('./common.js').debug;
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const matches = require('./common.js').matches;
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const normaliseOptions = require('./config.js');
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const shouldAddResourceHints = require('./resource-hints.js').shouldAddResourceHints;
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const addInitialChunkResourceHints = require('./initial-chunk-resource-hints.js');
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const addAsyncChunkResourceHints = require('./async-chunk-resource-hints.js');
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const elements = require('./elements.js');
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const customAttributes = require('./custom-attributes.js');
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const debugEvent = msg => debug(`${EVENT}: ${msg}`);
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const falsySafeConcat = arrays =>
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arrays.reduce(
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(combined, array) => array ? combined.concat(array) : combined,
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[]
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);
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const getHtmlWebpackOptions = pluginArgs =>
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(pluginArgs && pluginArgs.plugin && pluginArgs.plugin.options)
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? pluginArgs.plugin.options
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: {};
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const getCompilationOptions = compilation =>
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(compilation && compilation.options) ? compilation.options : {};
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class ScriptExtHtmlWebpackPlugin {
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constructor (options) {
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this.options = normaliseOptions(options);
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}
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apply (compiler) {
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const compile = this.compilationCallback.bind(this);
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const emit = this.emitCallback.bind(this);
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if (compiler.hooks) {
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compiler.hooks.compilation.tap(PLUGIN, compile);
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compiler.hooks.emit.tap(PLUGIN, emit);
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} else {
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compiler.plugin('compilation', compile);
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compiler.plugin('emit', emit);
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}
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}
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compilationCallback (compilation) {
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const alterAssetTags = this.alterAssetTagsCallback.bind(this, compilation);
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if (compilation.hooks) {
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const alterAssetTagGroups = compilation.hooks.htmlWebpackPluginAlterAssetTags || htmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups;
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alterAssetTagGroups.tap(PLUGIN, alterAssetTags);
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} else {
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compilation.plugin(EVENT, alterAssetTags);
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}
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}
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alterAssetTagsCallback (compilation, pluginArgs, callback) {
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const options = this.options;
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const headTagName = Object.prototype.hasOwnProperty.call(pluginArgs, 'headTags') ? 'headTags' : 'head';
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const bodyTagName = Object.prototype.hasOwnProperty.call(pluginArgs, 'bodyTags') ? 'bodyTags' : 'body';
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try {
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options.htmlWebpackOptions = getHtmlWebpackOptions(pluginArgs);
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options.compilationOptions = getCompilationOptions(compilation);
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debugEvent('starting');
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if (elements.shouldUpdate(options)) {
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debugEvent('replacing <head> <script> elements');
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pluginArgs[headTagName] = elements.update(compilation.assets, options, pluginArgs[headTagName]);
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debugEvent('replacing <body> <script> elements');
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pluginArgs[bodyTagName] = elements.update(compilation.assets, options, pluginArgs[bodyTagName]);
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}
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if (shouldAddResourceHints(options)) {
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debugEvent('adding resource hints');
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pluginArgs[headTagName] = falsySafeConcat([
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pluginArgs[headTagName],
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addInitialChunkResourceHints(options, pluginArgs[headTagName]),
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addInitialChunkResourceHints(options, pluginArgs[bodyTagName]),
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addAsyncChunkResourceHints(compilation.chunks, options)
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]);
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}
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if (customAttributes.shouldAdd(options)) {
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debugEvent('adding custom attribues to <head> <script> elements');
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pluginArgs[headTagName] = customAttributes.add(options, pluginArgs[headTagName]);
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debugEvent('adding custom attributes to <body> <script> elements');
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pluginArgs[bodyTagName] = customAttributes.add(options, pluginArgs[bodyTagName]);
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}
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debugEvent('completed');
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if (callback) {
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callback(null, pluginArgs);
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}
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} catch (err) {
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if (callback) {
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callback(err);
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} else {
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compilation.errors.push(err);
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}
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}
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}
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emitCallback (compilation, callback) {
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const options = this.options;
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if (options.inline.test.length > 0 && options.removeInlinedAssets) {
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debug('emit: deleting assets');
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Object.keys(compilation.assets).forEach((assetName) => {
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if (matches(assetName, options.inline.test)) {
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debug(`emit: deleting asset '${assetName}'`);
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delete compilation.assets[assetName];
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}
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});
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}
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if (callback) {
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callback();
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}
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}
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}
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module.exports = ScriptExtHtmlWebpackPlugin;
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