/**
 * Returns the 4-byte selector from raw serialized transaction hex or undefined if not present.
 * Supports legacy RLP and EIP-2718 typed transactions (via `@ethereumjs/tx`).
 *
 * @param rawTxHex - Raw serialized transaction hex (with or without `0x` prefix).
 * @returns The selector (`0x` + 8 hex digits, lowercased) or undefined if parsing fails or no calldata.
 */
export declare function getTransactionSelector(rawTxHex: string): string | undefined;
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