/**
 * `typeof` "bigint" alias.
 *
 * @category Primitives
 * @example
 * ```typescript
 * isBigInt(1n); // true
 * isBigInt(1); // false
 * ```
 * @returns `true` if the given value is a `bigint`, `false` otherwise.
 */
export declare const isBigInt: (input: unknown) => input is bigint;