/**
 * Polyfill `PublicKeyCredential.prototype.toJSON`
 *
 * See https://w3c.github.io/webauthn/#dom-publickeycredential-tojson
 */
export declare function toJSON(cred: PublicKeyCredential): PublicKeyCredentialJSON;
/**
 * Polyfill `PublicKeyCredential.parseRequestOptionsFromJSON`
 *
 * See https://w3c.github.io/webauthn/#sctn-parseRequestOptionsFromJSON
 */
export declare function parseRequestOptionsFromJSON(options: PublicKeyCredentialRequestOptionsJSON): PublicKeyCredentialRequestOptions;