src/vs/workbench/api/common/extHostWorkspace.ts/ExtHostWorkspace/resolveWorkspaceFolder
class ExtHostWorkspace:	async resolveWorkspaceFolder(uri: vscode.Uri): Promise<vscode.WorkspaceFolder | undefined> {
		await this._barrier.wait();
		if (!this._actualWorkspace) {
			return undefined;
		}
		return this._actualWorkspace.resolveWorkspaceFolder(uri);
	}