/**
 * The set of stable error codes this package raises.
 *
 * Branch on `err.code`, not on `err.message`: the codes are part of the
 * public API, the prose is not.
 */
export type HpkeErrorCode = 'ERR_INVALID_RECIPIENT_KEY' | 'ERR_INVALID_KEYPAIR' | 'ERR_SMALL_ORDER_KEY' | 'ERR_MALFORMED_ENVELOPE' | 'ERR_MALFORMED_MESSAGE' | 'ERR_INVALID_KEYSIZE' | 'ERR_INVALID_AES_KEY' | 'ERR_DECRYPT_FAILED';
/**
 * An `Error` carrying a stable `code`. Every throw site in this package
 * raises one of these, so callers can branch on the failure instead of
 * pattern matching on a message.
 *
 * Where a WebCrypto failure is being wrapped, the original is kept on
 * `cause`.
 */
export declare class HpkeError extends Error {
    readonly code: HpkeErrorCode;
    constructor(code: HpkeErrorCode, message: string, opts?: {
        cause?: unknown;
    });
}
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