export interface UrlValidationBase {
    toString(): string;
}
export interface UrlObjectValidationBase extends UrlValidationBase {
    protocol: string;
}
export type UrlStringValidationError = "empty" | "whitespace" | "invalid-url";
export interface UrlStringValidationOptions {
    baseUrl?: string | UrlValidationBase;
}
export declare function getUrlStringValidationError(value: unknown, options?: UrlStringValidationOptions): UrlStringValidationError | undefined;
export type AbsoluteHttpUrlValidationError = "empty" | "whitespace" | "not-absolute-http-url";
export declare function getAbsoluteHttpUrlValidationError(value: unknown): AbsoluteHttpUrlValidationError | undefined;
export type HttpUrlOrPathValidationError = "empty" | "whitespace" | "not-http-url-or-path";
export declare function getHttpUrlOrPathValidationError(value: unknown): HttpUrlOrPathValidationError | undefined;
export type HttpUrlOrAbsolutePathnameValidationError = "empty" | "whitespace" | "not-http-url-or-absolute-pathname";
export declare function getHttpUrlOrAbsolutePathnameValidationError(value: unknown): HttpUrlOrAbsolutePathnameValidationError | undefined;
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