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import Web3ProviderEngine = 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: Web3ProviderEngine, 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];
}
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