@metamask/providers
Version:
A JavaScript Ethereum provider that connects to the wallet over a stream
55 lines • 2.58 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.shimWeb3 = shimWeb3;
/**
* If no existing window.web3 is found, this function injects a web3 "shim" to
* not break dapps that rely on window.web3.currentProvider.
*
* @param provider - The provider to set as window.web3.currentProvider.
* @param log - The logging API to use.
*/
function shimWeb3(provider, log = console) {
let loggedCurrentProvider = false;
let loggedMissingProperty = false;
if (!window.web3) {
const SHIM_IDENTIFIER = '__isMetaMaskShim__';
let web3Shim = { currentProvider: provider };
Object.defineProperty(web3Shim, SHIM_IDENTIFIER, {
value: true,
enumerable: true,
configurable: false,
writable: false,
});
web3Shim = new Proxy(web3Shim, {
get: (target, property, ...args) => {
if (property === 'currentProvider' && !loggedCurrentProvider) {
loggedCurrentProvider = true;
log.warn('You are accessing the MetaMask window.web3.currentProvider shim. This property is deprecated; use window.ethereum instead. For details, see: https://docs.metamask.io/guide/provider-migration.html#replacing-window-web3');
}
else if (property !== 'currentProvider' &&
property !== SHIM_IDENTIFIER &&
!loggedMissingProperty) {
loggedMissingProperty = true;
log.error(`MetaMask no longer injects web3. For details, see: https://docs.metamask.io/guide/provider-migration.html#replacing-window-web3`);
provider
.request({ method: 'metamask_logWeb3ShimUsage' })
.catch((error) => {
log.debug('MetaMask: Failed to log web3 shim usage.', error);
});
}
return Reflect.get(target, property, ...args);
},
set: (...args) => {
log.warn('You are accessing the MetaMask window.web3 shim. This object is deprecated; use window.ethereum instead. For details, see: https://docs.metamask.io/guide/provider-migration.html#replacing-window-web3');
return Reflect.set(...args);
},
});
Object.defineProperty(window, 'web3', {
value: web3Shim,
enumerable: false,
configurable: true,
writable: true,
});
}
}
//# sourceMappingURL=shimWeb3.cjs.map