import type { TypedTransaction } from '@tevm/tx';
import { type Hex } from '@tevm/utils';
import type { BlockHeaderBytes, HeaderData } from './types.js';
/**
 * Returns a 0x-prefixed hex number string from a hex string or string integer.
 * @param {string} input string to check, convert, and return
 */
export declare const numberToHex: (input?: string) => Hex | undefined;
/**
 * Converts a BlockHeaderBytes array to a HeaderData object
 * @param {BlockHeaderBytes} values - Array of raw header bytes containing block header fields
 * @returns {HeaderData} The converted header data object with named properties
 * @example
 * ```typescript
 * import { valuesArrayToHeaderData } from '@tevm/block'
 *
 * // Convert raw header bytes to a structured HeaderData object
 * const headerData = valuesArrayToHeaderData(blockHeaderBytes)
 * console.log(headerData.parentHash, headerData.stateRoot)
 * ```
 */
export declare function valuesArrayToHeaderData(values: BlockHeaderBytes): HeaderData;
/**
 * Extracts the difficulty value from block header data
 * @param {HeaderData} headerData - The header data object to extract difficulty from
 * @returns {bigint | null} The difficulty as a bigint, or null if not present
 * @example
 * ```typescript
 * import { getDifficulty } from '@tevm/block'
 *
 * // Get the difficulty from a block header
 * const difficulty = getDifficulty(blockHeader)
 * if (difficulty !== null) {
 *   console.log(`Block difficulty: ${difficulty}`)
 * }
 * ```
 */
export declare function getDifficulty(headerData: HeaderData): bigint | null;
/**
 * Counts the total number of blobs in a list of transactions
 * Only EIP-4844 blob transactions contribute to this count
 * @param {TypedTransaction[]} transactions - Array of transactions to analyze
 * @returns {number} The total count of blobs across all blob transactions
 * @example
 * ```typescript
 * import { getNumBlobs } from '@tevm/block'
 *
 * // Count blobs in a block's transactions
 * const blobCount = getNumBlobs(block.transactions)
 * console.log(`Block contains ${blobCount} blobs`)
 * ```
 */
export declare const getNumBlobs: (transactions: TypedTransaction[]) => number;
/**
 * Approximates `factor * e ** (numerator / denominator)` using Taylor expansion
 */
export declare const fakeExponential: (factor: bigint, numerator: bigint, denominator: bigint) => bigint;
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