src/vs/workbench/api/common/extHostQuickOpen.ts/ExtHostQuickOpenImpl/$validateInput
class ExtHostQuickOpenImpl:		$validateInput(input: string): Promise<string | { content: string; severity: Severity } | null | undefined> {
			if (this._validateInput) {
				return asPromise(() => this._validateInput!(input));
			}
			return Promise.resolve(undefined);
		}