@gnosis.pm/dapp-ui/lib/subscriptions/metamask.js

Web3 provider setup functions built with Typescript and love. From Gnosis.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MetamaskSubscriptionsSymbol = Symbol('MetamaskSubscriptions');
const createMetamaskSubscriptions = (provider) => {
    const onAccountsChanged = (cb, once) => {
        if (once) {
            provider.once('accountsChanged', cb);
        }
        else {
            provider.on('accountsChanged', cb);
        }
        return () => {
            provider.off('accountsChanged', cb);
        };
    };
    const onNetworkChanged = (cb, once) => {
        if (once) {
            provider.once('networkChanged', cb);
        }
        else {
            provider.on('networkChanged', cb);
        }
        return () => {
            provider.off('networkChanged', cb);
        };
    };
    const onData = (cb, once) => {
        if (once) {
            provider.once('data', cb);
        }
        else {
            provider.on('data', cb);
        }
        return () => {
            provider.off('data', cb);
        };
    };
    const onError = (cb, once) => {
        if (once) {
            provider.once('error', cb);
        }
        else {
            provider.on('error', cb);
        }
        return () => {
            provider.off('error', cb);
        };
    };
    return {
        [exports.MetamaskSubscriptionsSymbol]: true,
        onAccountsChanged,
        onNetworkChanged,
        onData,
        onError,
    };
};
exports.default = createMetamaskSubscriptions;
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