Ensure external extensions are in the extensions project (microsoft#178285)

Author: TylerLeonhardt

build/lib/i18n.js

@@ -843,9 +843,12 @@ export function prepareI18nPackFiles(resultingTranslationPaths: TranslationPath[
 	const extensionsPacks: Record<string, I18nPack> = {};
 	const errors: any[] = [];
 	return through(function (this: ThroughStream, xlf: File) {
-		const project = path.basename(path.dirname(path.dirname(xlf.relative)));
+		let project = path.basename(path.dirname(path.dirname(xlf.relative)));
 		// strip `-new` since vscode-extensions-loc uses the `-new` suffix to indicate that it's from the new loc pipeline
 		const resource = path.basename(path.basename(xlf.relative, '.xlf'), '-new');
+		if (EXTERNAL_EXTENSIONS.find(e => e === resource)) {
+			project = extensionsProject;
+		}
 		const contents = xlf.contents.toString();
 		log(`Found ${project}: ${resource}`);
 		const parsePromise = getL10nFilesFromXlf(contents);

build/lib/i18n.ts

@@ -24,7 +24,7 @@ function update(options) {
 		throw new Error(`${location} doesn't exist.`);
 	}
 	let externalExtensionsLocation = options.externalExtensionsLocation;
-	if (externalExtensionsLocation !== undefined && !fs.existsSync(location)) {
+	if (externalExtensionsLocation !== undefined && !fs.existsSync(externalExtensionsLocation)) {
 		throw new Error(`${externalExtensionsLocation} doesn't exist.`);
 	}
 	let locExtFolder = idOrPath;