viem
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JavaScript
import { parseAccount } from '../../accounts/utils/parseAccount.js';
import { numberToHex } from '../../utils/encoding/toHex.js';
/**
* Extract capabilities that a connected wallet supports (e.g. paymasters, session keys, etc).
*
* - Docs: https://viem.sh/docs/actions/wallet/getCapabilities
* - JSON-RPC Methods: [`wallet_getCapabilities`](https://eips.ethereum.org/EIPS/eip-5792)
*
* @param client - Client to use
* @returns The wallet's capabilities. {@link GetCapabilitiesReturnType}
*
* @example
* import { createWalletClient, custom } from 'viem'
* import { mainnet } from 'viem/chains'
* import { getCapabilities } from 'viem/actions'
*
* const client = createWalletClient({
* chain: mainnet,
* transport: custom(window.ethereum),
* })
* const capabilities = await getCapabilities(client)
*/
export async function getCapabilities(client, parameters = {}) {
const { account = client.account, chainId } = parameters;
const account_ = account ? parseAccount(account) : undefined;
const params = chainId
? [account_?.address, [numberToHex(chainId)]]
: [account_?.address];
const capabilities_raw = await client.request({
method: 'wallet_getCapabilities',
params,
});
const capabilities = {};
for (const [chainId, capabilities_] of Object.entries(capabilities_raw)) {
capabilities[Number(chainId)] = {};
for (let [key, value] of Object.entries(capabilities_)) {
if (key === 'addSubAccount')
key = 'unstable_addSubAccount';
capabilities[Number(chainId)][key] = value;
}
}
return (typeof chainId === 'number' ? capabilities[chainId] : capabilities);
}
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