import * as Bytes from './Bytes.js';
import type * as Errors from './Errors.js';
/**
 * Creates a credential-bound PRF configuration from a UTF-8 tag.
 *
 * Tags are public, stable identifiers. Use the same tag with the same
 * credential to reproduce a PRF output.
 *
 * @example
 * ```ts twoslash
 * import { Prf, WebAuthn } from 'ox'
 *
 * const credential = await WebAuthn.getCredential({
 *   credentialId: 'oZ48...',
 *   prf: Prf.tag('account.1')
 * })
 * ```
 *
 * @param value - Tag to encode.
 * @returns A credential-bound PRF configuration.
 */
export declare function tag(value: string): tag.ReturnType;
export declare namespace tag {
    /** Credential-bound PRF configuration. */
    type ReturnType = {
        /** UTF-8 encoded PRF input. */
        input: Bytes.Bytes;
    };
    type ErrorType = Bytes.fromString.ErrorType | Errors.GlobalErrorType;
}
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