extensions/typescript-language-features/src/task/taskProvider.ts/TscTaskProvider/getLocalTscAtPath
class TscTaskProvider:	private static async getLocalTscAtPath(folderPath: string): Promise<string | undefined> {
		const platform = process.platform;
		const bin = path.join(folderPath, 'node_modules', '.bin');
		if (platform === 'win32' && await exists(vscode.Uri.file(path.join(bin, 'tsc.cmd')))) {
			return path.join(bin, 'tsc.cmd');
		} else if ((platform === 'linux' || platform === 'darwin') && await exists(vscode.Uri.file(path.join(bin, 'tsc')))) {
			return path.join(bin, 'tsc');
		}
		return undefined;
	}