request.ts

import { byteEncoder, createSchemaHash } from '@0xpolygonid/js-sdk';
import { Path, getDocumentLoader, Merklizer } from '@iden3/js-jsonld-merklization';

const pathToCredentialSubject = 'https://www.w3.org/2018/credentials#credentialSubject';

export async function generateRequestData() {
  const url = `https://raw.githubusercontent.com/iden3/claim-schema-vocab/main/schemas/json-ld/kyc-v101.json-ld`;
  const type = 'KYCAgeCredential';
  const fieldName = 'birthday'; // in form of field.field2.field3 field must be present in the credential subject

  const opts = { ipfsGatewayURL: 'https://ipfs.io' }; // can be your IFPS gateway if your work with ipfs schemas or empty object
  const ldCtx = (await getDocumentLoader(opts)(url)).document;
  const ldJSONStr = JSON.stringify(ldCtx);
  // const ldBytes = byteEncoder.encode(ldJSONStr);
  const typeId = await Path.getTypeIDFromContext(ldJSONStr, type);
  const schemaHash = createSchemaHash(byteEncoder.encode(typeId));
  console.log('schemaId', schemaHash.bigInt().toString());

  // you can use custom IPFS
  const path = await Path.getContextPathKey(ldJSONStr, type, fieldName, opts);
  path.prepend([pathToCredentialSubject]);
  const pathBigInt = await path.mtEntry();

  console.log('path', pathBigInt.toString());

  // you can hash the value according to the datatype (that's how it is stored in core claim structure)

  const fieldInfo = {
    pathToField: 'KYCEmployee.position',
    value: 'developer'
  };

  const datatype = await Path.newTypeFromContext(ldJSONStr, fieldInfo.pathToField);
  console.log(datatype); // make sure it is http://www.w3.org/2001/XMLSchema#string
  const hashedValue = await Merklizer.hashValue(datatype, fieldInfo.value);
  console.log(hashedValue);
}