refactor: replace module-alias dependency with internal alias resolver (#3893)

- removes the external unmaintained `module-alias` dependency ->
reducing complexity and risk
- introduces a small internal alias mechanism for `logger` and
`node_helper`
- preserves backward compatibility for existing 3rd‑party modules
- should simplify a future ESM migration of MagicMirror

I'm confident that it shouldn't cause any problems, but we could also
consider including it in the release after next. What do you think?

This PR is inspired by PR #2934 - so thanks to @thesebas! 🙇 😃

Author: KristjanESPERANTO

CHANGELOG.md

@@ -15,6 +15,8 @@ planned for 2026-01-01
 
 ### Changed
 
+- [core] refactor: replace `module-alias` dependency with internal alias resolver (#3893)
+
 ### Fixed
 
 ### Updated

jest.config.js

@@ -1,3 +1,7 @@
+const aliasMapper = {
+	logger: "<rootDir>/js/logger.js"
+};
+
 const config = {
 	verbose: true,
 	testTimeout: 20000,
@@ -6,21 +10,21 @@ const config = {
 		{
 			displayName: "unit",
 			globalSetup: "<rootDir>/tests/unit/helpers/global-setup.js",
-			moduleNameMapper: {
-				logger: "<rootDir>/js/logger.js"
-			},
+			moduleNameMapper: aliasMapper,
 			testMatch: ["**/tests/unit/**/*.[jt]s?(x)"],
 			testPathIgnorePatterns: ["<rootDir>/tests/unit/mocks", "<rootDir>/tests/unit/helpers"]
 		},
 		{
 			displayName: "electron",
 			testMatch: ["**/tests/electron/**/*.[jt]s?(x)"],
+			moduleNameMapper: aliasMapper,
 			testPathIgnorePatterns: ["<rootDir>/tests/electron/helpers"]
 		},
 		{
 			displayName: "e2e",
 			testMatch: ["**/tests/e2e/**/*.[jt]s?(x)"],
 			modulePaths: ["<rootDir>/js/"],
+			moduleNameMapper: aliasMapper,
 			testPathIgnorePatterns: ["<rootDir>/tests/e2e/helpers", "<rootDir>/tests/e2e/mocks"]
 		}
 	],

js/alias-resolver.js

@@ -0,0 +1,31 @@
+// Internal alias mapping for default and 3rd party modules.
+// Provides short require identifiers: "logger" and "node_helper".
+// For a future ESM migration, replace this with a public export/import surface.
+
+const path = require("node:path");
+const Module = require("module");
+
+const root = path.join(__dirname, "..");
+
+// Keep this list minimal; do not add new aliases without architectural review.
+const ALIASES = {
+	logger: "js/logger.js",
+	node_helper: "js/node_helper.js"
+};
+
+// Resolve to absolute paths now.
+const resolved = Object.fromEntries(
+	Object.entries(ALIASES).map(([k, rel]) => [k, path.join(root, rel)])
+);
+
+// Prevent multiple patching if this file is required more than once.
+if (!Module._mmAliasPatched) {
+	const origResolveFilename = Module._resolveFilename;
+	Module._resolveFilename = function (request, parent, isMain, options) {
+		if (Object.prototype.hasOwnProperty.call(resolved, request)) {
+			return resolved[request];
+		}
+		return origResolveFilename.call(this, request, parent, isMain, options);
+	};
+	Module._mmAliasPatched = true; // non-enumerable marker would be overkill here
+}

js/app.js

@@ -1,5 +1,5 @@
-// Alias modules mentioned in package.js under _moduleAliases.
-require("module-alias/register");
+// Load lightweight internal alias resolver
+require("./alias-resolver");
 
 const fs = require("node:fs");
 const path = require("node:path");

js/check_config.js

@@ -1,12 +1,15 @@
+// Ensure internal require aliases (e.g., "logger") resolve when this file is run as a standalone script
+require("./alias-resolver");
+
 const path = require("node:path");
 const fs = require("node:fs");
 const { styleText } = require("node:util");
 const Ajv = require("ajv");
 const globals = require("globals");
 const { Linter } = require("eslint");
+const Log = require("logger");
 
 const rootPath = path.resolve(`${__dirname}/../`);
-const Log = require(`${rootPath}/js/logger.js`);
 const Utils = require(`${rootPath}/js/utils.js`);
 
 const linter = new Linter({ configType: "flat" });

js/utils.js

@@ -1,10 +1,7 @@
-const path = require("node:path");
-
-const rootPath = path.resolve(`${__dirname}/../`);
-const Log = require(`${rootPath}/js/logger.js`);
 const os = require("node:os");
 const fs = require("node:fs");
 const si = require("systeminformation");
+const Log = require("logger");
 
 const modulePositions = []; // will get list from index.html
 const regionRegEx = /"region ([^"]*)/i;

modules/default/calendar/debug.js

@@ -3,8 +3,8 @@
  * use this script with `node debug.js` to test the fetcher without the need
  * of starting the MagicMirror² core. Adjust the values below to your desire.
  */
-// Alias modules mentioned in package.js under _moduleAliases.
-require("module-alias/register");
+// Load internal alias resolver
+require("../../../js/alias-resolver");
 const Log = require("logger");
 
 const CalendarFetcher = require("./calendarfetcher");

package-lock.json

@@ -84,7 +84,6 @@
 		"helmet": "^8.1.0",
 		"html-to-text": "^9.0.5",
 		"iconv-lite": "^0.7.0",
-		"module-alias": "^2.2.3",
 		"moment": "^2.30.1",
 		"moment-timezone": "^0.6.0",
 		"node-ical": "^0.21.0",
@@ -121,9 +120,5 @@
 	},
 	"engines": {
 		"node": ">=22.18.0"
-	},
-	"_moduleAliases": {
-		"node_helper": "js/node_helper.js",
-		"logger": "js/logger.js"
 	}
 }