method GenericExtrinsicPayload.prototype.signimport { GenericExtrinsicPayload } from "https://dotland.deno.dev/x/polkadot@0.2.45/types/bundle.ts"; sign(signerPair: IKeyringPair): { signature: HexString; }ParameterssignerPair: IKeyringPairReturns{ signature: HexString; }