/**
 * @packageDocumentation
 *
 * Validation utilities.
 */
/**
 * Holds a validation message.
 */
export interface ValidationMessageHolder {
    /**
     * A validation message.
     */
    validationMessage: string;
}
/**
 * Type guard to check if a value is a validation message holder.
 *
 * @param value - The value to check.
 * @returns `true` if the value is a validation message holder, `false` otherwise.
 */
export declare function isValidationMessageHolder(value: unknown): value is ValidationMessageHolder;
/**
 * Matches characters that are not safe to use in file names within Obsidian.
 */
export declare const OBSIDIAN_UNSAFE_FILENAME_CHARS: RegExp;
/**
 * Windows-specific unsafe file name path characters.
 */
export declare const WINDOWS_UNSAFE_PATH_CHARS: RegExp;
/**
 * Unix-specific unsafe file name path characters.
 */
export declare const UNIX_UNSAFE_PATH_CHARS: RegExp;
/**
 * Returns a regexp matching all unsafe characters in file names/paths.
 *
 * Includes both OS-specific restrictions and Obsidian-specific ones.
 *
 * @param isWindows - Whether to include Windows-specific restrictions. Defaults to `Platform.isWin`.
 * @returns A regexp matching all unsafe characters in file names/paths.
 */
export declare function getOsAndObsidianUnsafePathCharsRegExp(isWindows?: boolean): RegExp;
/**
 * Returns a regexp matching characters that are not safe to use in file names/paths at the OS level.
 *
 * @param isWindows - Whether to include Windows-specific restrictions. Defaults to `Platform.isWin`.
 * @returns A regexp matching characters that are not safe to use in file names/paths at the OS level.
 */
export declare function getOsUnsafePathCharsRegExp(isWindows?: boolean): RegExp;