// Ambient types for `tweetnacl-sealedbox-js` (crypto_box_seal), which ships without its own.
// The library is a small UMD bundle over `tweetnacl` and `blakejs`; only `seal` is used here.
declare module "tweetnacl-sealedbox-js" {
  /** crypto_box_seal: returns ephemeralPub(32) ‖ box, sealed to `recipientPublicKey`. */
  export function seal(message: Uint8Array, recipientPublicKey: Uint8Array): Uint8Array;
  /** crypto_box_seal_open: returns the plaintext, or null if it does not open. */
  export function open(
    sealed: Uint8Array,
    recipientPublicKey: Uint8Array,
    recipientSecretKey: Uint8Array,
  ): Uint8Array | null;
  export const overheadLength: number;
}