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writeObserver.ts
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writeObserver.ts
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import type {
WriteContractParameters,
Transport,
Chain,
Account,
WalletActions,
WalletClient,
WriteContractReturnType,
} from "viem";
import { getAction } from "viem/utils";
import { writeContract } from "viem/actions";
import { type ContractWrite } from "../getContract";
type WriteObserverParameters = { onWrite: (write: ContractWrite) => void };
export function writeObserver<TChain extends Chain, TAccount extends Account>({
onWrite,
}: WriteObserverParameters): (
client: WalletClient<Transport, TChain, TAccount>,
) => Pick<WalletActions<TChain, TAccount>, "writeContract"> {
let nextWriteId = 0;
return (client) => ({
// Applies to: `client.writeContract`, `getContract(client, ...).write`
writeContract: (args): Promise<WriteContractReturnType> => {
const result = getAction(client, writeContract, "writeContract")(args);
const id = `${client.chain.id}:${client.account.address}:${nextWriteId++}`;
onWrite({ id, request: args as WriteContractParameters, result });
return result;
},
});
}