source: frontend/node_modules/webpack/lib/dependencies/CommonJsSelfReferenceDependency.js@ cdcff72

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const { equals } = require("../util/ArrayHelpers");
const makeSerializable = require("../util/makeSerializable");
const { propertyAccess } = require("../util/property");
const NullDependency = require("./NullDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").ReferencedExports} ReferencedExports */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ExportsInfo").ExportInfoName} ExportInfoName */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
/** @typedef {import("./CommonJsDependencyHelpers").CommonJSDependencyBaseKeywords} CommonJSDependencyBaseKeywords */

class CommonJsSelfReferenceDependency extends NullDependency {
        /**
         * Creates an instance of CommonJsSelfReferenceDependency.
         * @param {Range} range range
         * @param {CommonJSDependencyBaseKeywords} base base
         * @param {ExportInfoName[]} names names
         * @param {boolean} call is a call
         */
        constructor(range, base, names, call) {
                super();
                this.range = range;
                this.base = base;
                this.names = names;
                this.call = call;
        }

        get type() {
                return "cjs self exports reference";
        }

        get category() {
                return "self";
        }

        /**
         * Returns an identifier to merge equal requests.
         * @returns {string | null} an identifier to merge equal requests
         */
        getResourceIdentifier() {
                return "self";
        }

        /**
         * Returns list of exports referenced by this dependency
         * @param {ModuleGraph} moduleGraph module graph
         * @param {RuntimeSpec} runtime the runtime for which the module is analysed
         * @returns {ReferencedExports} referenced exports
         */
        getReferencedExports(moduleGraph, runtime) {
                return [this.call ? this.names.slice(0, -1) : this.names];
        }

        /**
         * Serializes this instance into the provided serializer context.
         * @param {ObjectSerializerContext} context context
         */
        serialize(context) {
                const { write } = context;
                write(this.range);
                write(this.base);
                write(this.names);
                write(this.call);
                super.serialize(context);
        }

        /**
         * Restores this instance from the provided deserializer context.
         * @param {ObjectDeserializerContext} context context
         */
        deserialize(context) {
                const { read } = context;
                this.range = read();
                this.base = read();
                this.names = read();
                this.call = read();
                super.deserialize(context);
        }
}

makeSerializable(
        CommonJsSelfReferenceDependency,
        "webpack/lib/dependencies/CommonJsSelfReferenceDependency"
);

CommonJsSelfReferenceDependency.Template = class CommonJsSelfReferenceDependencyTemplate extends (
        NullDependency.Template
) {
        /**
         * Applies the plugin by registering its hooks on the compiler.
         * @param {Dependency} dependency the dependency for which the template should be applied
         * @param {ReplaceSource} source the current replace source which can be modified
         * @param {DependencyTemplateContext} templateContext the context object
         * @returns {void}
         */
        apply(
                dependency,
                source,
                { module, moduleGraph, runtime, runtimeRequirements }
        ) {
                const dep = /** @type {CommonJsSelfReferenceDependency} */ (dependency);
                const used =
                        dep.names.length === 0
                                ? dep.names
                                : moduleGraph.getExportsInfo(module).getUsedName(dep.names, runtime);
                if (!used) {
                        throw new Error(
                                "Self-reference dependency has unused export name: This should not happen"
                        );
                }

                /** @type {string} */
                let base;
                switch (dep.base) {
                        case "exports":
                                runtimeRequirements.add(RuntimeGlobals.exports);
                                base = module.exportsArgument;
                                break;
                        case "module.exports":
                                runtimeRequirements.add(RuntimeGlobals.module);
                                base = `${module.moduleArgument}.exports`;
                                break;
                        case "this":
                                runtimeRequirements.add(RuntimeGlobals.thisAsExports);
                                base = "this";
                                break;
                        default:
                                throw new Error(`Unsupported base ${dep.base}`);
                }

                if (base === dep.base && equals(used, dep.names)) {
                        // Nothing has to be changed
                        // We don't use a replacement for compat reasons
                        // for plugins that update `module._source` which they
                        // shouldn't do!
                        return;
                }

                source.replace(
                        dep.range[0],
                        dep.range[1] - 1,
                        `${base}${propertyAccess(used)}`
                );
        }
};

module.exports = CommonJsSelfReferenceDependency;