import type { DynamicClient } from '@dynamic-labs-sdk/client';
import type { EvmWalletAccount } from '../../EvmWalletAccount.types';
type ApproveErc20Params = {
    amount: bigint;
    spenderAddress: string;
    tokenAddress: string;
    walletAccount: EvmWalletAccount;
};
/**
 * Sends an ERC-20 `approve` transaction, granting a spender an allowance
 * to transfer tokens on behalf of the wallet account.
 *
 * Encodes the `approve(spender, amount)` call using viem's `encodeFunctionData`
 * and sends it through the wallet account's viem wallet client.
 *
 * @param params.amount - The amount to approve in the token's smallest unit.
 * @param params.spenderAddress - The address being granted the allowance.
 * @param params.tokenAddress - The ERC-20 token contract address.
 * @param params.walletAccount - The EVM wallet account sending the approval.
 * @param client - The Dynamic client instance.
 * @returns The approval transaction hash.
  * @not-instrumented
 */
export declare const approveErc20: ({ amount, spenderAddress, tokenAddress, walletAccount }: ApproveErc20Params, client: DynamicClient) => Promise<{
    transactionHash: string;
}>;
export {};
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