/// <reference types="bn.js" />
import type { U8aLike } from '../types';
import { BN } from '../bn';
/**
 * @name compactFromU8a
 * @description Retrives the offset and encoded length from a compact-prefixed value
 * @example
 * <BR>
 *
 * ```javascript
 * import { compactFromU8a } from '@polkadot/util';
 *
 * const [offset, length] = compactFromU8a(new Uint8Array([254, 255, 3, 0]));
 *
 * console.log('value offset=', offset, 'length=', length); // 4, 0xffff
 * ```
 */
export declare function compactFromU8a(input: U8aLike): [number, BN];