src/vs/workbench/api/common/extHostOutput.ts/ExtHostOutputService/createOutputDirectory
class ExtHostOutputService:	private createOutputDirectory(): Thenable<URI> {
		if (!this.outputDirectoryPromise) {
			this.outputDirectoryPromise = this.extHostFileSystem.value.createDirectory(this.outputsLocation).then(() => this.outputsLocation);
		}
		return this.outputDirectoryPromise;
	}