1 files changed, 65 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/WarnCaseSensitiveModulesPlugin.js b/node_modules/webpack/lib/WarnCaseSensitiveModulesPlugin.js
new file mode 100644
index 00000000..11af42a5
--- /dev/null
+++ b/node_modules/webpack/lib/WarnCaseSensitiveModulesPlugin.js
@@ -0,0 +1,65 @@
+/*
+	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 */
+/** @typedef {import("./NormalModule")} NormalModule */
+
+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();
+
+						// Ignore `data:` URLs, because it's not a real path
+						if (
+							/** @type {NormalModule} */
+							(module).resourceResolveData !== undefined &&
+							/** @type {NormalModule} */
+							(module).resourceResolveData.encodedContent !== undefined
+						) {
+							continue;
+						}
+
+						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;