method HttpProvider.prototype.onimport { HttpProvider } from "https://deno.land/x/polkadot@0.2.35/api/mod.ts"; on(_type: ProviderInterfaceEmitted, _sub: ProviderInterfaceEmitCb): () => voidParameters_type: ProviderInterfaceEmitted_sub: ProviderInterfaceEmitCbReturns() => void