class BTreeMap extends CodecMap<K, V>import { BTreeMap } from "https://deno.land/x/polkadot@0.2.37/types/codec/index.ts"; Type ParametersoptionalK extends Codec = CodecoptionalV extends Codec = CodecStatic Methodswith<K extends Codec, V extends Codec>(keyType: CodecClass<K> | string, valType: CodecClass<V> | string): CodecClass<CodecMap<K, V>>