Generics for signDocument

[yehjxraymond]

Current signDocument changes the type to a generic Promise<SignedWrappedDocument<v2.OpenAttestationDocument>>, add in generic to automatically update the type of output.

[Nebulis]

wrong repo ? https://github.com/Open-Attestation/oa-did-sign/blob/master/src/signDocument/signDocument.ts

This could work:

export const signDocument = async (
  document: SignedWrappedDocument<T extends v2.OpenAttestationDocument> | WrappedDocument<T extends v2.OpenAttestationDocument>,
  algorithm: string,
  publicKey: string,
  privateKey: string
): Promise<SignedWrappedDocument<T>>

[yehjxraymond]

Added in https://github.com/Open-Attestation/oa-did-sign/pull/1/files

Thanks!