extensions/typescript-language-features/src/task/taskProvider.ts/TscTaskProvider/getAllTsConfigs
class TscTaskProvider:	private async getAllTsConfigs(token: vscode.CancellationToken): Promise<TSConfig[]> {
		const configs = flatten(await Promise.all([
			this.getTsConfigForActiveFile(token),
			this.getTsConfigsInWorkspace(token),
		]));

		return Promise.all(
			configs.map(async config => await exists(config.uri) ? config : undefined),
		).then(coalesce);
	}