Add helpful warnings to migration tool

packages/tools/kolibri-cli/src/migrate/index.ts

@@ -23,6 +23,7 @@ import {
 	MODIFIED_FILES,
 	POST_MESSAGES,
 	setRemoveMode,
+	hasKolibriTags,
 } from './shares/reuse';
 import { REMOVE_MODE, RemoveMode } from './types';
 
@@ -91,6 +92,13 @@ Target version of @public-ui/*: ${options.overwriteTargetVersion}
 Source folder to migrate: ${baseDir}
 `);
 
+				if (!fs.existsSync(baseDir)) {
+					throw logAndCreateError(`The specified source folder "${baseDir}" does not exist or is inaccessible. Please check the path and try again.`);
+				}
+				if (!hasKolibriTags(baseDir)) {
+					console.log(chalk.yellow(`No KoliBri components (web or React) found under "${baseDir}". Check the path or your task configuration.`));
+				}
+
 				if (!options.ignoreGreaterVersion && semver.lt(options.overwriteTargetVersion, options.overwriteCurrentVersion)) {
 					throw logAndCreateError(
 						'Your current version of @public-ui/components is greater than the version of @public-ui/kolibri-cli. Please update @public-ui/kolibri-cli or force the migration with --ignore-greater-version.',
@@ -203,6 +211,10 @@ Modified files: ${MODIFIED_FILES.size}`);
 						console.log(`- ${file}`);
 					});
 
+					if (MODIFIED_FILES.size === 0) {
+						console.log(chalk.yellow(`No files were modified. Verify the folder "${baseDir}" or check your .kolibri.config.json tasks.`));
+					}
+
 					if (MODIFIED_FILES.size > 0 && options.format) {
 						console.log(`
 We try to format the modified files with prettier...`);

packages/tools/kolibri-cli/src/migrate/shares/reuse.ts

@@ -2,7 +2,7 @@ import chalk from 'chalk';
 import fs from 'fs';
 import path from 'path';
 
-import { FileExtension, PackageJson } from '../../types';
+import { FileExtension, PackageJson, MARKUP_EXTENSIONS, WEB_TAG_REGEX, REACT_TAG_REGEX } from '../../types';
 import { RemoveMode } from '../types';
 
 /**
@@ -61,6 +61,29 @@ export function filterFilesByExt(dir: string, ext: FileExtension | FileExtension
 	return files;
 }
 
+/**
+ * Checks if the specified directory contains any files with KoliBri tags.
+ * @param {string} dir The directory to search in
+ * @returns {boolean} True if at least one file contains KoliBri component tags (web or React)
+ */
+export function hasKolibriTags(dir: string): boolean {
+	const regexes = [WEB_TAG_REGEX, REACT_TAG_REGEX];
+	const files = filterFilesByExt(dir, MARKUP_EXTENSIONS);
+
+	for (const file of files) {
+		try {
+			const content = fs.readFileSync(file, 'utf8');
+			if (regexes.some((regex) => regex.test(content))) {
+				return true;
+			}
+		} catch (err) {
+			console.error(`Error reading file ${file}:`, err);
+		}
+	}
+
+	return false;
+}
+
 /**
  * This function is used to get the version of the package.json as string.
  * @param {string} offsetPath The offset path to the package.json

packages/tools/kolibri-cli/src/types.ts

@@ -5,6 +5,9 @@ export const COMPONENT_FILE_EXTENSIONS: FileExtension[] = ['jsx', 'tsx', 'vue'];
 export const CUSTOM_ELEMENT_FILE_EXTENSIONS: FileExtension[] = ['html', 'xhtml', 'jsx', 'tsx', 'vue'];
 export const MARKUP_EXTENSIONS: FileExtension[] = COMPONENT_FILE_EXTENSIONS.concat(CUSTOM_ELEMENT_FILE_EXTENSIONS);
 
+export const WEB_TAG_REGEX = /\b<kol-[a-z-]+/i;
+export const REACT_TAG_REGEX = /\b<Kol[A-Z][A-Za-z]*/;
+
 export type PackageJson = {
 	name: string;
 	version: string;

packages/tools/visual-tests/src/index.js

@@ -6,8 +6,9 @@ import { readFile } from 'fs/promises';
 import * as fs from 'fs';
 import portfinder from 'portfinder';
 import * as process from 'process';
+import os from 'node:os';
 
-const tempDir = process.env.RUNNER_TEMP || process.env.TMPDIR; // TODO: Check on Windows
+const tempDir = process.env.RUNNER_TEMP || process.env.TMPDIR || os.tmpdir(); // TODO: Check on Windows
 
 if (!process.env.THEME_MODULE) {
 	throw new Error('Environment variable THEME_MODULE not specified.');