jest.preset.js

const nxPreset = require('@nrwl/jest/preset');
const tsPreset = require('ts-jest/presets/js-with-babel/jest-preset');

module.exports = {
  ...nxPreset,
  ...tsPreset,
  coverageReporters: [...nxPreset.coverageReporters, 'text'],
  collectCoverageFrom: ['<rootDir>/src/**/*.ts'],
  transformIgnorePatterns: ['/node_modules/(?!@polkadot|@babel/runtime/helpers/esm/)'],
};