export declare function validateFileExists(
  filePath: string,
  optionName: string
): string;
export declare function validateDirectoryExists(
  dirPath: string,
  optionName: string
): string;
export declare function validatePort(port: number, optionName: string): number;
export declare function validateUrl(
  urlString: string,
  optionName: string
): string;
export declare function validateFileExtension(
  filePath: string,
  validExtensions: string[],
  optionName: string
): string;
export declare function validatePattern(
  value: string,
  pattern: RegExp,
  optionName: string,
  patternDescription: string
): string;
export declare function isUrl(value: string): boolean;
export declare function validateFileOrUrl(
  source: string,
  optionName: string
): string;
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