mirror of https://github.com/webpack/webpack.git
350 lines
11 KiB
JavaScript
350 lines
11 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 { ConcatSource } = require("webpack-sources");
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const { UsageState } = require("../ExportsInfo");
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const Template = require("../Template");
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const propertyAccess = require("../util/propertyAccess");
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const { getEntryRuntime } = require("../util/runtime");
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const AbstractLibraryPlugin = require("./AbstractLibraryPlugin");
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("../../declarations/WebpackOptions").LibraryOptions} LibraryOptions */
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/** @typedef {import("../../declarations/WebpackOptions").LibraryType} LibraryType */
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compilation").ChunkHashContext} ChunkHashContext */
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/** @typedef {import("../Compiler")} Compiler */
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/** @typedef {import("../Module")} Module */
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/** @typedef {import("../javascript/JavascriptModulesPlugin").RenderContext} RenderContext */
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/** @typedef {import("../javascript/JavascriptModulesPlugin").StartupRenderContext} StartupRenderContext */
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/** @typedef {import("../util/Hash")} Hash */
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/** @template T @typedef {import("./AbstractLibraryPlugin").LibraryContext<T>} LibraryContext<T> */
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const KEYWORD_REGEX = /^(await|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|false|finally|for|function|if|implements|import|in|instanceof|interface|let|new|null|package|private|protected|public|return|super|switch|static|this|throw|try|true|typeof|var|void|while|with|yield)$/;
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const IDENTIFIER_REGEX = /^[\p{L}\p{Nl}$_][\p{L}\p{Nl}$\p{Mn}\p{Mc}\p{Nd}\p{Pc}]*$/iu;
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/**
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* Validates the library name by checking for keywords and valid characters
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* @param {string} name name to be validated
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* @returns {boolean} true, when valid
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*/
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const isNameValid = name => {
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return !KEYWORD_REGEX.test(name) && IDENTIFIER_REGEX.test(name);
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};
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/**
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* @param {string[]} accessor variable plus properties
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* @param {number} existingLength items of accessor that are existing already
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* @param {boolean=} initLast if the last property should also be initialized to an object
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* @returns {string} code to access the accessor while initializing
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*/
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const accessWithInit = (accessor, existingLength, initLast = false) => {
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// This generates for [a, b, c, d]:
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// (((a = typeof a === "undefined" ? {} : a).b = a.b || {}).c = a.b.c || {}).d
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const base = accessor[0];
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if (accessor.length === 1 && !initLast) return base;
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let current =
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existingLength > 0
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? base
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: `(${base} = typeof ${base} === "undefined" ? {} : ${base})`;
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// i is the current position in accessor that has been printed
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let i = 1;
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// all properties printed so far (excluding base)
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let propsSoFar;
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// if there is existingLength, print all properties until this position as property access
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if (existingLength > i) {
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propsSoFar = accessor.slice(1, existingLength);
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i = existingLength;
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current += propertyAccess(propsSoFar);
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} else {
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propsSoFar = [];
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}
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// all remaining properties (except the last one when initLast is not set)
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// should be printed as initializer
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const initUntil = initLast ? accessor.length : accessor.length - 1;
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for (; i < initUntil; i++) {
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const prop = accessor[i];
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propsSoFar.push(prop);
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current = `(${current}${propertyAccess([prop])} = ${base}${propertyAccess(
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propsSoFar
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)} || {})`;
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}
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// print the last property as property access if not yet printed
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if (i < accessor.length)
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current = `${current}${propertyAccess([accessor[accessor.length - 1]])}`;
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return current;
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};
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/**
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* @typedef {Object} AssignLibraryPluginOptions
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* @property {LibraryType} type
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* @property {string[] | "global"} prefix name prefix
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* @property {string | false} declare declare name as variable
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* @property {"error"|"copy"|"assign"} unnamed behavior for unnamed library name
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* @property {"copy"|"assign"=} named behavior for named library name
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*/
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/**
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* @typedef {Object} AssignLibraryPluginParsed
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* @property {string | string[]} name
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* @property {string | string[] | undefined} export
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*/
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/**
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* @typedef {AssignLibraryPluginParsed} T
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* @extends {AbstractLibraryPlugin<AssignLibraryPluginParsed>}
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*/
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class AssignLibraryPlugin extends AbstractLibraryPlugin {
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/**
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* @param {AssignLibraryPluginOptions} options the plugin options
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*/
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constructor(options) {
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super({
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pluginName: "AssignLibraryPlugin",
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type: options.type
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});
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this.prefix = options.prefix;
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this.declare = options.declare;
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this.unnamed = options.unnamed;
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this.named = options.named || "assign";
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}
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/**
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* @param {LibraryOptions} library normalized library option
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* @returns {T | false} preprocess as needed by overriding
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*/
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parseOptions(library) {
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const { name } = library;
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if (this.unnamed === "error") {
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if (typeof name !== "string" && !Array.isArray(name)) {
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throw new Error(
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`Library name must be a string or string array. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
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);
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}
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} else {
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if (name && typeof name !== "string" && !Array.isArray(name)) {
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throw new Error(
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`Library name must be a string, string array or unset. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
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);
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}
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}
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return {
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name: /** @type {string|string[]=} */ (name),
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export: library.export
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};
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}
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/**
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* @param {Module} module the exporting entry module
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* @param {string} entryName the name of the entrypoint
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* @param {LibraryContext<T>} libraryContext context
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* @returns {void}
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*/
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finishEntryModule(
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module,
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entryName,
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{ options, compilation, compilation: { moduleGraph } }
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) {
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const runtime = getEntryRuntime(compilation, entryName);
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if (options.export) {
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const exportsInfo = moduleGraph.getExportInfo(
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module,
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Array.isArray(options.export) ? options.export[0] : options.export
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);
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exportsInfo.setUsed(UsageState.Used, runtime);
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exportsInfo.canMangleUse = false;
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} else {
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const exportsInfo = moduleGraph.getExportsInfo(module);
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exportsInfo.setUsedInUnknownWay(runtime);
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}
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moduleGraph.addExtraReason(module, "used as library export");
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}
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_getPrefix(compilation) {
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return this.prefix === "global"
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? [compilation.outputOptions.globalObject]
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: this.prefix;
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}
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_getResolvedFullName(options, chunk, compilation) {
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const prefix = this._getPrefix(compilation);
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const fullName = options.name ? prefix.concat(options.name) : prefix;
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return fullName.map(n =>
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compilation.getPath(n, {
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chunk
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})
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);
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}
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/**
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* @param {Source} source source
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* @param {RenderContext} renderContext render context
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* @param {LibraryContext<T>} libraryContext context
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* @returns {Source} source with library export
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*/
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render(source, { chunk }, { options, compilation }) {
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const fullNameResolved = this._getResolvedFullName(
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options,
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chunk,
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compilation
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);
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if (this.declare) {
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const base = fullNameResolved[0];
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if (!isNameValid(base)) {
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throw new Error(
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`Library name base (${base}) must be a valid identifier when using a var declaring library type. Either use a valid identifier (e. g. ${Template.toIdentifier(
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base
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)}) or use a different library type (e. g. 'type: "global"', which assign a property on the global scope instead of declaring a variable). ${
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AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE
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}`
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);
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}
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source = new ConcatSource(`${this.declare} ${base};\n`, source);
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}
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return source;
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}
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/**
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* @param {Module} module the exporting entry module
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* @param {RenderContext} renderContext render context
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* @param {LibraryContext<T>} libraryContext context
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* @returns {string | undefined} bailout reason
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*/
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embedInRuntimeBailout(module, { chunk }, { options, compilation }) {
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const topLevelDeclarations =
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module.buildInfo && module.buildInfo.topLevelDeclarations;
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if (!topLevelDeclarations)
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return "it doesn't tell about top level declarations.";
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const fullNameResolved = this._getResolvedFullName(
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options,
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chunk,
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compilation
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);
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const base = fullNameResolved[0];
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if (topLevelDeclarations.has(base))
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return `it declares '${base}' on top-level, which conflicts with the current library output.`;
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}
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/**
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* @param {RenderContext} renderContext render context
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* @param {LibraryContext<T>} libraryContext context
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* @returns {string | undefined} bailout reason
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*/
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strictRuntimeBailout({ chunk }, { options, compilation }) {
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if (
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this.declare ||
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this.prefix === "global" ||
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this.prefix.length > 0 ||
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!options.name
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) {
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return;
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}
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return "a global variable is assign and maybe created";
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}
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/**
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* @param {Source} source source
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* @param {Module} module module
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* @param {StartupRenderContext} renderContext render context
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* @param {LibraryContext<T>} libraryContext context
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* @returns {Source} source with library export
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*/
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renderStartup(source, module, { chunk }, { options, compilation }) {
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const fullNameResolved = this._getResolvedFullName(
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options,
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chunk,
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compilation
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);
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const exportAccess = options.export
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? propertyAccess(
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Array.isArray(options.export) ? options.export : [options.export]
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)
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: "";
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const result = new ConcatSource(source);
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if (options.name ? this.named === "copy" : this.unnamed === "copy") {
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result.add(
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`var __webpack_export_target__ = ${accessWithInit(
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fullNameResolved,
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this._getPrefix(compilation).length,
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true
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)};\n`
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);
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let exports = "__webpack_exports__";
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if (exportAccess) {
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result.add(
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`var __webpack_exports_export__ = __webpack_exports__${exportAccess};\n`
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);
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exports = "__webpack_exports_export__";
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}
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result.add(
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`for(var i in ${exports}) __webpack_export_target__[i] = ${exports}[i];\n`
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);
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result.add(
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`if(${exports}.__esModule) Object.defineProperty(__webpack_export_target__, "__esModule", { value: true });\n`
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);
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} else {
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result.add(
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`${accessWithInit(
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fullNameResolved,
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this._getPrefix(compilation).length,
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false
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)} = __webpack_exports__${exportAccess};\n`
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);
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}
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return result;
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}
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/**
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* @param {Chunk} chunk the chunk
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* @param {Set<string>} set runtime requirements
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* @param {LibraryContext<T>} libraryContext context
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* @returns {void}
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*/
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runtimeRequirements(chunk, set, libraryContext) {
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// we don't need to return exports from runtime
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}
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/**
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* @param {Chunk} chunk the chunk
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* @param {Hash} hash hash
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* @param {ChunkHashContext} chunkHashContext chunk hash context
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* @param {LibraryContext<T>} libraryContext context
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* @returns {void}
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*/
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chunkHash(chunk, hash, chunkHashContext, { options, compilation }) {
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hash.update("AssignLibraryPlugin");
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const prefix =
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this.prefix === "global"
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? [compilation.outputOptions.globalObject]
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: this.prefix;
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const fullName = options.name ? prefix.concat(options.name) : prefix;
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const fullNameResolved = fullName.map(n =>
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compilation.getPath(n, {
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chunk
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})
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);
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if (options.name ? this.named === "copy" : this.unnamed === "copy") {
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hash.update("copy");
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}
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if (this.declare) {
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hash.update(this.declare);
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}
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hash.update(fullNameResolved.join("."));
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if (options.export) {
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hash.update(`${options.export}`);
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}
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}
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}
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module.exports = AssignLibraryPlugin;
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