method Linkage.withKeyimport { Linkage } from "https://deno.land/x/polkadot@0.2.45/types/codec/index.ts"; withKey<O extends Codec>(Type: CodecClass | string): CodecClass<Linkage<O>>Type ParametersO extends CodecParametersType: CodecClass | stringReturnsCodecClass<Linkage<O>>