import ProviderEngine = require('web3-provider-engine'); import { Subprovider } from '../subproviders/subprovider'; /** * Prepends a subprovider to a provider * @param provider Given provider * @param subprovider Subprovider to prepend */ export function prependSubprovider(provider: ProviderEngine, subprovider: Subprovider): void { subprovider.setEngine(provider); // HACK: We use implementation details of provider engine here // https://github.com/MetaMask/provider-engine/blob/master/index.js#L68 (provider as any)._providers = [subprovider, ...(provider as any)._providers]; }