viem
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JavaScript
import { formatUnits } from '../../utils/unit/formatUnits.js';
import { writeContractSync } from '../wallet/writeContractSync.js';
import { approve } from './approve.js';
import { resolveAmountDecimals, resolveToken } from './internal.js';
/**
* Approves a spender to transfer ERC-20 tokens on behalf of the caller, and
* waits for the transaction to be confirmed.
*
* @example
* ```ts
* import { createClient, http } from 'viem'
* import { mainnet } from 'viem/chains'
* import { privateKeyToAccount } from 'viem/accounts'
* import { token } from 'viem/actions'
*
* const client = createClient({
* account: privateKeyToAccount('0x...'),
* chain: mainnet,
* transport: http(),
* })
*
* const { receipt, ...event } = await token.approveSync(client, {
* amount: 100000000n,
* spender: '0x...',
* token: '0x...',
* })
* ```
*
* @param client - Client.
* @param parameters - Parameters.
* @returns The transaction receipt and event data.
*/
export async function approveSync(client, parameters) {
const { amount, token, throwOnReceiptRevert = true } = parameters;
const { decimals } = resolveToken(client, { token });
const resolved = resolveAmountDecimals(amount, decimals);
const receipt = await approve.inner(writeContractSync, client, {
...parameters,
throwOnReceiptRevert,
});
const { args } = approve.extractEvent(receipt.logs);
return {
...args,
...(resolved === undefined
? {}
: { decimals: resolved, formatted: formatUnits(args.value, resolved) }),
receipt,
};
}
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