fix: properly select icons dir for tags & error if no metadata found (#3411)

Fixes #3359
Throwing an error in readAllMetadata now to ensure this error can't happen again in the future.
The error was caused by this script being moved to a different dir, but the relative url not being updated, causing no icons to be found.

packages/lucide-static/scripts/migrateIconsToTags.mts

@@ -2,7 +2,9 @@ import path from 'path';
 import { writeFile, getCurrentDirPath, readAllMetadata } from '@lucide/helpers';
 
 const currentDir = getCurrentDirPath(import.meta.url);
-const ICONS_DIR = path.resolve(currentDir, '../icons');
+
+const PACKAGE_DIR = path.resolve(currentDir, '../');
+const ICONS_DIR = path.join(PACKAGE_DIR, '../../icons');
 const icons = await readAllMetadata(ICONS_DIR);
 
 const tags = Object.keys(icons)

tools/build-helpers/src/readAllMetadata.ts

@@ -16,6 +16,9 @@ export const readAllMetadata = async (directory: string): Promise<Record<string,
     .map(async (file) => [path.basename(file, '.json'), await readMetadata(file, directory)]);
 
   const metadata = await Promise.all(metaDataPromises);
+  if (metadata.length === 0) {
+    throw new Error(`No metadata files found in directory: ${directory}`);
+  }
 
   return Object.fromEntries(metadata);
 };