extensions/typescript-language-features/src/tsServer/versionProvider.electron.ts/DiskTypeScriptVersionProvider/loadTypeScriptVersionsFromPath
class DiskTypeScriptVersionProvider:	private loadTypeScriptVersionsFromPath(source: TypeScriptVersionSource, relativePath: string): TypeScriptVersion[] {
		if (!vscode.workspace.workspaceFolders) {
			return [];
		}

		const versions: TypeScriptVersion[] = [];
		for (const root of vscode.workspace.workspaceFolders) {
			let label: string = relativePath;
			if (vscode.workspace.workspaceFolders.length > 1) {
				label = path.join(root.name, relativePath);
			}

			const serverPath = path.join(root.uri.fsPath, relativePath, 'tsserver.js');
			versions.push(new TypeScriptVersion(source, serverPath, DiskTypeScriptVersionProvider.getApiVersion(serverPath), label));
		}
		return versions;
	}