/** A zero-knowledge prover utility to be used with HollowDB.
 *
 * You will need to provide paths to a WASM circuit, and a prover key.
 * You can find these files [here](./circuits/) in the repository. it is up to you to decide where to place them for your application.
 * For example, in a web-app you may place under the `public` directory.
 *
 * You can also choose to provide the protocol, which defaults to Groth16.
 */
export class Prover {
    readonly protocol: 'groth16' | 'plonk';
    constructor(wasmPath: string, proverKeyPath: string, protocol?: 'groth16' | 'plonk');
    /** Generate a zero-knowledge proof.
     *
     * Calls {@link hashToGroup} on inputs, and then generates
     * a proof with {@link proveHashed}.
     */
    prove(preimage: bigint, curValue: unknown, nextValue: unknown): Promise<{
        proof: object;
        publicSignals: [curValueHash: string, nextValueHash: string, key: string];
    }>;
    /** Generate a zero-knowledge proof.
     *
     * Value inputs are expected to be results of {@link hashToGroup}. The
     * incentive of using this function instead of {@link prove} is that the
     * hash may be stored somewhere, and there is no need to hash the entire value
     * again at a later time instead of using the existing hash.
     */
    proveHashed(preimage: bigint, curValueHash: bigint, nextValueHash: bigint): Promise<{
        proof: object;
        publicSignals: [curValueHash: string, nextValueHash: string, key: string];
    }>;
}
/** Given an input, stringifies and then hashes it and make sure the result is circuit-friendly for
 * [BN254](https://docs.circom.io/background/background/#signals-of-a-circuit).
 *
 * Uses Ripemd160 for the hash where 160-bit output is guaranteed to be
 * circuit-friendly (i.e. within the order of the curve's scalar field).
 *
 * If a given value is falsy, it will NOT be hashed but instead mapped to 0.
 */
export function hashToGroup(value: unknown): bigint;
/** Compute the key that is the Poseidon hash of some preimage.
 *
 * The returned key is a string in hexadecimal format with 0x prefix.
 */
export function computeKey(preimage: bigint): string;

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