source: trip-planner-front/node_modules/webpack/lib/WarnCaseSensitiveModulesPlugin.js@ bdd6491

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

"use strict";

const CaseSensitiveModulesWarning = require("./CaseSensitiveModulesWarning");

/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Module")} Module */

class WarnCaseSensitiveModulesPlugin {
        /**
         * Apply the plugin
         * @param {Compiler} compiler the compiler instance
         * @returns {void}
         */
        apply(compiler) {
                compiler.hooks.compilation.tap(
                        "WarnCaseSensitiveModulesPlugin",
                        compilation => {
                                compilation.hooks.seal.tap("WarnCaseSensitiveModulesPlugin", () => {
                                        /** @type {Map<string, Map<string, Module>>} */
                                        const moduleWithoutCase = new Map();
                                        for (const module of compilation.modules) {
                                                const identifier = module.identifier();
                                                const lowerIdentifier = identifier.toLowerCase();
                                                let map = moduleWithoutCase.get(lowerIdentifier);
                                                if (map === undefined) {
                                                        map = new Map();
                                                        moduleWithoutCase.set(lowerIdentifier, map);
                                                }
                                                map.set(identifier, module);
                                        }
                                        for (const pair of moduleWithoutCase) {
                                                const map = pair[1];
                                                if (map.size > 1) {
                                                        compilation.warnings.push(
                                                                new CaseSensitiveModulesWarning(
                                                                        map.values(),
                                                                        compilation.moduleGraph
                                                                )
                                                        );
                                                }
                                        }
                                });
                        }
                );
        }
}

module.exports = WarnCaseSensitiveModulesPlugin;