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node_modules/webpack/lib/WarnCaseSensitiveModulesPlugin.js

@@ -8,23 +8,29 @@ const CaseSensitiveModulesWarning = require("./CaseSensitiveModulesWarning");
 
 class WarnCaseSensitiveModulesPlugin {
 	apply(compiler) {
-		compiler.plugin("compilation", compilation => {
-			compilation.plugin("seal", () => {
-				const moduleWithoutCase = Object.create(null);
-				compilation.modules.forEach(module => {
-					const identifier = module.identifier().toLowerCase();
-					if(moduleWithoutCase[identifier]) {
-						moduleWithoutCase[identifier].push(module);
-					} else {
-						moduleWithoutCase[identifier] = [module];
+		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));
+						}
 					}
 				});
-				Object.keys(moduleWithoutCase).forEach(key => {
-					if(moduleWithoutCase[key].length > 1)
-						compilation.warnings.push(new CaseSensitiveModulesWarning(moduleWithoutCase[key]));
-				});
-			});
-		});
+			}
+		);
 	}
 }