src/vs/workbench/services/configuration/browser/configurationService.ts/WorkspaceService/createWorkspace
class WorkspaceService:	private async createWorkspace(arg: IWorkspaceInitializationPayload): Promise<Workspace> {
		if (isWorkspaceIdentifier(arg)) {
			return this.createMultiFolderWorkspace(arg);
		}

		if (isSingleFolderWorkspaceIdentifier(arg)) {
			return this.createSingleFolderWorkspace(arg);
		}

		return this.createEmptyWorkspace(arg);
	}