/*
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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 { equals } = require("../util/ArrayHelpers");
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const makeSerializable = require("../util/makeSerializable");
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const { propertyAccess } = require("../util/property");
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const NullDependency = require("./NullDependency");
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/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
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/** @typedef {import("../Dependency")} Dependency */
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/** @typedef {import("../Dependency").ReferencedExports} ReferencedExports */
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/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
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/** @typedef {import("../ModuleGraph")} ModuleGraph */
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/** @typedef {import("../ExportsInfo").ExportInfoName} ExportInfoName */
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/** @typedef {import("../javascript/JavascriptParser").Range} Range */
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/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
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/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
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/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
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/** @typedef {import("./CommonJsDependencyHelpers").CommonJSDependencyBaseKeywords} CommonJSDependencyBaseKeywords */
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class CommonJsSelfReferenceDependency extends NullDependency {
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/**
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* Creates an instance of CommonJsSelfReferenceDependency.
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* @param {Range} range range
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* @param {CommonJSDependencyBaseKeywords} base base
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* @param {ExportInfoName[]} names names
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* @param {boolean} call is a call
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*/
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constructor(range, base, names, call) {
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super();
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this.range = range;
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this.base = base;
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this.names = names;
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this.call = call;
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}
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get type() {
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return "cjs self exports reference";
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}
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get category() {
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return "self";
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}
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/**
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* Returns an identifier to merge equal requests.
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* @returns {string | null} an identifier to merge equal requests
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*/
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getResourceIdentifier() {
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return "self";
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}
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/**
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* Returns list of exports referenced by this dependency
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* @param {ModuleGraph} moduleGraph module graph
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* @param {RuntimeSpec} runtime the runtime for which the module is analysed
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* @returns {ReferencedExports} referenced exports
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*/
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getReferencedExports(moduleGraph, runtime) {
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return [this.call ? this.names.slice(0, -1) : this.names];
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}
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/**
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* Serializes this instance into the provided serializer context.
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* @param {ObjectSerializerContext} context context
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*/
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serialize(context) {
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const { write } = context;
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write(this.range);
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write(this.base);
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write(this.names);
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write(this.call);
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super.serialize(context);
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}
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/**
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* Restores this instance from the provided deserializer context.
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* @param {ObjectDeserializerContext} context context
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*/
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deserialize(context) {
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const { read } = context;
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this.range = read();
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this.base = read();
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this.names = read();
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this.call = read();
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super.deserialize(context);
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}
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}
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makeSerializable(
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CommonJsSelfReferenceDependency,
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"webpack/lib/dependencies/CommonJsSelfReferenceDependency"
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);
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CommonJsSelfReferenceDependency.Template = class CommonJsSelfReferenceDependencyTemplate extends (
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NullDependency.Template
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) {
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/**
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* Applies the plugin by registering its hooks on the compiler.
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* @param {Dependency} dependency the dependency for which the template should be applied
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* @param {ReplaceSource} source the current replace source which can be modified
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* @param {DependencyTemplateContext} templateContext the context object
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* @returns {void}
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*/
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apply(
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dependency,
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source,
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{ module, moduleGraph, runtime, runtimeRequirements }
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) {
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const dep = /** @type {CommonJsSelfReferenceDependency} */ (dependency);
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const used =
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dep.names.length === 0
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? dep.names
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: moduleGraph.getExportsInfo(module).getUsedName(dep.names, runtime);
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if (!used) {
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throw new Error(
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"Self-reference dependency has unused export name: This should not happen"
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);
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}
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/** @type {string} */
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let base;
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switch (dep.base) {
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case "exports":
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runtimeRequirements.add(RuntimeGlobals.exports);
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base = module.exportsArgument;
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break;
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case "module.exports":
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runtimeRequirements.add(RuntimeGlobals.module);
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base = `${module.moduleArgument}.exports`;
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break;
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case "this":
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runtimeRequirements.add(RuntimeGlobals.thisAsExports);
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base = "this";
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break;
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default:
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throw new Error(`Unsupported base ${dep.base}`);
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}
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if (base === dep.base && equals(used, dep.names)) {
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// Nothing has to be changed
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// We don't use a replacement for compat reasons
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// for plugins that update `module._source` which they
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// shouldn't do!
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return;
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}
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source.replace(
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dep.range[0],
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dep.range[1] - 1,
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`${base}${propertyAccess(used)}`
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);
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}
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};
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module.exports = CommonJsSelfReferenceDependency;
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