import type { TEnvValidator } from './types';
/** Requires a string value. */
export declare const stringValidator: TEnvValidator<unknown, string>;
/** Accepts "true", "t", "yes", "on", "1" and their false counterparts. Returns a boolean. */
export declare const booleanValidator: TEnvValidator<unknown, boolean>;
/** Parses finite numbers from strings or number values. */
export declare const numberValidator: TEnvValidator<unknown, number>;
/** Checks a practical email shape: local part, at sign, domain with at least one dot. */
export declare const emailValidator: TEnvValidator<unknown, string>;
/** Accepts fully qualified domain names and IPv4 or IPv6 addresses. */
export declare const hostValidator: TEnvValidator<unknown, string>;
/** Validates integer port numbers in the range 1 to 65535. */
export declare const portValidator: TEnvValidator<unknown, number>;
/** Requires a valid URL parseable by the WHATWG URL standard. */
export declare const urlValidator: TEnvValidator<unknown, string>;
/** Parses a JSON string and returns the parsed value. Output type is unknown. */
export declare const jsonValidator: TEnvValidator<unknown, unknown>;
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