mirror of https://github.com/webpack/webpack.git
154 lines
3.8 KiB
JavaScript
154 lines
3.8 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compilation")} Compilation */
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/**
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* @typedef {object} AssetInfo
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* @property {string} url
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* @property {string} as
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* @property {string=} fetchPriority
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* @property {string=} type
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*/
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/**
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* @typedef {object} AssetPrefetchInfo
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* @property {AssetInfo[]} prefetch
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* @property {AssetInfo[]} preload
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*/
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class AssetPrefetchStartupRuntimeModule extends RuntimeModule {
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/**
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* @param {AssetPrefetchInfo} assetInfo asset prefetch/preload information
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*/
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constructor(assetInfo) {
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super("asset prefetch", RuntimeModule.STAGE_TRIGGER);
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this.assetInfo = assetInfo;
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}
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/**
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* @returns {string} a unique identifier of the module
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*/
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identifier() {
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return `webpack/runtime/asset-prefetch-startup|${JSON.stringify(
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this.assetInfo
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)}`;
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}
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/**
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* @returns {string | null} runtime code
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*/
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generate() {
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const { assetInfo } = this;
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const compilation = /** @type {Compilation} */ (this.compilation);
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const { runtimeTemplate } = compilation;
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const lines = [];
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/**
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* @param {AssetInfo} asset The asset information to serialize
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* @returns {string} Serialized arguments for prefetch/preload function
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*/
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const serializeAsset = (asset) => {
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const args = [
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`${RuntimeGlobals.publicPath} + ${JSON.stringify(asset.url)}`,
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`"${asset.as}"`
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];
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if (asset.fetchPriority) {
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args.push(`"${asset.fetchPriority}"`);
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} else {
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args.push("undefined");
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}
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if (asset.type) {
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args.push(`"${asset.type}"`);
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}
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return args.join(", ");
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};
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if (assetInfo.prefetch.length > 0) {
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const prefetchCode =
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assetInfo.prefetch.length <= 2
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? assetInfo.prefetch.map(
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(asset) =>
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`${RuntimeGlobals.prefetchAsset}(${serializeAsset(asset)});`
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)
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: Template.asString([
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`[${assetInfo.prefetch
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.map(
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(asset) =>
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`{ url: ${RuntimeGlobals.publicPath} + ${JSON.stringify(
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asset.url
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)}, as: "${asset.as}"${
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asset.fetchPriority
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? `, fetchPriority: "${asset.fetchPriority}"`
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: ""
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}${asset.type ? `, type: "${asset.type}"` : ""} }`
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)
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.join(", ")}].forEach(${runtimeTemplate.basicFunction("asset", [
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`${RuntimeGlobals.prefetchAsset}(asset.url, asset.as, asset.fetchPriority, asset.type);`
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])});`
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]);
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if (Array.isArray(prefetchCode)) {
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lines.push(...prefetchCode);
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} else {
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lines.push(prefetchCode);
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}
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}
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if (assetInfo.preload.length > 0) {
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const preloadCode =
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assetInfo.preload.length <= 2
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? assetInfo.preload.map(
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(asset) =>
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`${RuntimeGlobals.preloadAsset}(${serializeAsset(asset)});`
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)
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: Template.asString([
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`[${assetInfo.preload
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.map(
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(asset) =>
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`{ url: ${RuntimeGlobals.publicPath} + ${JSON.stringify(
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asset.url
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)}, as: "${asset.as}"${
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asset.fetchPriority
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? `, fetchPriority: "${asset.fetchPriority}"`
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: ""
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}${asset.type ? `, type: "${asset.type}"` : ""} }`
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)
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.join(", ")}].forEach(${runtimeTemplate.basicFunction("asset", [
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`${RuntimeGlobals.preloadAsset}(asset.url, asset.as, asset.fetchPriority, asset.type);`
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])});`
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]);
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if (Array.isArray(preloadCode)) {
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lines.push(...preloadCode);
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} else {
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lines.push(preloadCode);
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}
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}
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return Template.asString(lines);
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}
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/**
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* @returns {boolean} true, if the runtime module should get it's own scope
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*/
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shouldIsolate() {
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return false;
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}
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}
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module.exports = AssetPrefetchStartupRuntimeModule;
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