source: trip-planner-front/node_modules/webpack/lib/dependencies/HarmonyExportExpressionDependency.js

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

"use strict";

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

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */

class HarmonyExportExpressionDependency extends NullDependency {
        constructor(range, rangeStatement, prefix, declarationId) {
                super();
                this.range = range;
                this.rangeStatement = rangeStatement;
                this.prefix = prefix;
                this.declarationId = declarationId;
        }

        get type() {
                return "harmony export expression";
        }

        /**
         * Returns the exported names
         * @param {ModuleGraph} moduleGraph module graph
         * @returns {ExportsSpec | undefined} export names
         */
        getExports(moduleGraph) {
                return {
                        exports: ["default"],
                        priority: 1,
                        terminalBinding: true,
                        dependencies: undefined
                };
        }

        /**
         * @param {ModuleGraph} moduleGraph the module graph
         * @returns {ConnectionState} how this dependency connects the module to referencing modules
         */
        getModuleEvaluationSideEffectsState(moduleGraph) {
                // The expression/declaration is already covered by SideEffectsFlagPlugin
                return false;
        }

        serialize(context) {
                const { write } = context;
                write(this.range);
                write(this.rangeStatement);
                write(this.prefix);
                write(this.declarationId);
                super.serialize(context);
        }

        deserialize(context) {
                const { read } = context;
                this.range = read();
                this.rangeStatement = read();
                this.prefix = read();
                this.declarationId = read();
                super.deserialize(context);
        }
}

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

HarmonyExportExpressionDependency.Template = class HarmonyExportDependencyTemplate extends (
        NullDependency.Template
) {
        /**
         * @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,
                        runtimeTemplate,
                        runtimeRequirements,
                        initFragments,
                        runtime,
                        concatenationScope
                }
        ) {
                const dep = /** @type {HarmonyExportExpressionDependency} */ (dependency);
                const { declarationId } = dep;
                const exportsName = module.exportsArgument;
                if (declarationId) {
                        let name;
                        if (typeof declarationId === "string") {
                                name = declarationId;
                        } else {
                                name = ConcatenationScope.DEFAULT_EXPORT;
                                source.replace(
                                        declarationId.range[0],
                                        declarationId.range[1] - 1,
                                        `${declarationId.prefix}${name}${declarationId.suffix}`
                                );
                        }

                        if (concatenationScope) {
                                concatenationScope.registerExport("default", name);
                        } else {
                                const used = moduleGraph
                                        .getExportsInfo(module)
                                        .getUsedName("default", runtime);
                                if (used) {
                                        const map = new Map();
                                        map.set(used, `/* export default binding */ ${name}`);
                                        initFragments.push(new HarmonyExportInitFragment(exportsName, map));
                                }
                        }

                        source.replace(
                                dep.rangeStatement[0],
                                dep.range[0] - 1,
                                `/* harmony default export */ ${dep.prefix}`
                        );
                } else {
                        let content;
                        const name = ConcatenationScope.DEFAULT_EXPORT;
                        if (runtimeTemplate.supportsConst()) {
                                content = `/* harmony default export */ const ${name} = `;
                                if (concatenationScope) {
                                        concatenationScope.registerExport("default", name);
                                } else {
                                        const used = moduleGraph
                                                .getExportsInfo(module)
                                                .getUsedName("default", runtime);
                                        if (used) {
                                                runtimeRequirements.add(RuntimeGlobals.exports);
                                                const map = new Map();
                                                map.set(used, name);
                                                initFragments.push(new HarmonyExportInitFragment(exportsName, map));
                                        } else {
                                                content = `/* unused harmony default export */ var ${name} = `;
                                        }
                                }
                        } else if (concatenationScope) {
                                content = `/* harmony default export */ var ${name} = `;
                                concatenationScope.registerExport("default", name);
                        } else {
                                const used = moduleGraph
                                        .getExportsInfo(module)
                                        .getUsedName("default", runtime);
                                if (used) {
                                        runtimeRequirements.add(RuntimeGlobals.exports);
                                        // This is a little bit incorrect as TDZ is not correct, but we can't use const.
                                        content = `/* harmony default export */ ${exportsName}[${JSON.stringify(
                                                used
                                        )}] = `;
                                } else {
                                        content = `/* unused harmony default export */ var ${name} = `;
                                }
                        }

                        if (dep.range) {
                                source.replace(
                                        dep.rangeStatement[0],
                                        dep.range[0] - 1,
                                        content + "(" + dep.prefix
                                );
                                source.replace(dep.range[1], dep.rangeStatement[1] - 0.5, ");");
                                return;
                        }

                        source.replace(dep.rangeStatement[0], dep.rangeStatement[1] - 1, content);
                }
        }
};

module.exports = HarmonyExportExpressionDependency;