/**
 * Modular inverse.
 *
 * @param a The number to find an inverse for
 * @param n The modulo
 *
 * @throws {@link RangeError} if a does not have inverse modulo n
 *
 * @returns The inverse modulo n
 */
export declare function modInv(a: number | bigint, n: number | bigint): bigint;
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