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

	"use strict";

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

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

	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", () => {
	const moduleWithoutCase = new Map();
	for (const module of compilation.modules) {
	const identifier = module.identifier().toLowerCase();
	const array = moduleWithoutCase.get(identifier);
	if (array) {
	array.push(module);
	} else {
	moduleWithoutCase.set(identifier, [module]);
	}
	}
	for (const pair of moduleWithoutCase) {
	const array = pair[1];
	if (array.length > 1) {
	compilation.warnings.push(
	new CaseSensitiveModulesWarning(array, compilation.moduleGraph)
	);
	}
	}
	});
	}
	);
	}
	}

	module.exports = WarnCaseSensitiveModulesPlugin;