add simple script to check how many variables from the main language is in use at the moment

src/Umbraco.Web.UI.Client/devops/localization/unused-language-keys.js

@@ -0,0 +1,64 @@
+/**
+ * This script is used to find unused language keys in the javascript files. It will take a main language (en.js) and compare with the other languages.
+ *
+ * Usage: node devops/localization/unused-language-keys.js
+ * Example: node devops/localization/unused-language-keys.js
+ *
+ * Copyright (c) 2024 by Umbraco HQ
+ */
+import fs from 'fs';
+import path from 'path';
+import glob from 'tiny-glob';
+
+const mainLanguage = 'en.js';
+
+const __dirname = import.meta.dirname;
+const languageFolder = path.join(__dirname, '../../dist-cms/assets/lang');
+
+// Check that the languageFolder exists
+if (!fs.existsSync(languageFolder)) {
+	console.error(`The language folder does not exist: ${languageFolder}. You need to build the project first by running 'npm run build'`);
+	process.exit(1);
+}
+
+const mainKeys = (await import(path.join(languageFolder, mainLanguage))).default;
+const mainMap = buildMap(mainKeys);
+const keys = Array.from(mainMap.keys());
+const usedKeys = new Set();
+
+const elementAndControllerFiles = await glob(`${__dirname}/../../src/**/*.ts`);
+
+console.log(`Checking ${elementAndControllerFiles.length} files for unused keys`);
+
+// Find all the keys used in the javascript files
+const filePromise = Promise.all(elementAndControllerFiles.map(async (file) => {
+	// Check if each key is in the file (simple)
+	const fileContent = fs.readFileSync(file, 'utf8');
+	keys.forEach((key) => {
+		if (fileContent.includes(key)) {
+			usedKeys.add(key);
+		}
+	});
+}));
+
+await filePromise;
+
+const unusedKeys = Array.from(mainMap.keys()).filter((key) => !usedKeys.has(key));
+
+console.log(`\n${mainLanguage}:`);
+console.log(`Used keys in ${mainLanguage}:`);
+console.log(usedKeys);
+console.log(`Unused keys in ${mainLanguage}:`);
+console.log(unusedKeys);
+
+function buildMap(keys) {
+	const map = new Map();
+
+	for (const key in keys) {
+		for (const subKey in keys[key]) {
+			map.set(`${key}_${subKey}`, keys[key][subKey]);
+		}
+	}
+
+	return map;
+}