source: frontend/node_modules/webpack/lib/dependencies/ConstDependency.js

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

"use strict";

const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("./NullDependency").RawRuntimeRequirements} RawRuntimeRequirements */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../util/Hash")} Hash */

class ConstDependency extends NullDependency {
        /**
         * Creates an instance of ConstDependency.
         * @param {string} expression the expression
         * @param {number | Range} range the source range
         * @param {RawRuntimeRequirements | null=} runtimeRequirements runtime requirements
         */
        constructor(expression, range, runtimeRequirements) {
                super();
                this.expression = expression;
                this.range = range;
                this.runtimeRequirements = runtimeRequirements
                        ? new Set(runtimeRequirements)
                        : null;
                /** @type {undefined | string} */
                this._hashUpdate = undefined;
        }

        /**
         * Updates the hash with the data contributed by this instance.
         * @param {Hash} hash hash to be updated
         * @param {UpdateHashContext} context context
         * @returns {void}
         */
        updateHash(hash, context) {
                if (this._hashUpdate === undefined) {
                        let hashUpdate = `${this.range}|${this.expression}`;
                        if (this.runtimeRequirements) {
                                for (const item of this.runtimeRequirements) {
                                        hashUpdate += "|";
                                        hashUpdate += item;
                                }
                        }
                        this._hashUpdate = hashUpdate;
                }
                hash.update(this._hashUpdate);
        }

        /**
         * Gets module evaluation side effects state.
         * @param {ModuleGraph} moduleGraph the module graph
         * @returns {ConnectionState} how this dependency connects the module to referencing modules
         */
        getModuleEvaluationSideEffectsState(moduleGraph) {
                return false;
        }

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

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

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

ConstDependency.Template = class ConstDependencyTemplate 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, templateContext) {
                const dep = /** @type {ConstDependency} */ (dependency);
                if (dep.runtimeRequirements) {
                        for (const req of dep.runtimeRequirements) {
                                templateContext.runtimeRequirements.add(req);
                        }
                }
                if (typeof dep.range === "number") {
                        source.insert(dep.range, dep.expression);
                        return;
                }

                source.replace(dep.range[0], dep.range[1] - 1, dep.expression);
        }
};

module.exports = ConstDependency;