fix(clients): generate jest.config.js

[trivikr]

Issue

Refs: #1618
Alternative to #2163

Description

Generate jest.config.js per client instead of extending from global config

Testing

CI

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[aws-sdk-js-automation]

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• Commit ID: e909261
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[alexforsyth]

Ahh I see, LGTM

[G-Rath]

btw jest supports jest.config.ts & ts-jest extends @jest/types types for its global options, i.e

import { Config } from '@jest/types';
import 'ts-jest';

const config: Config.InitialOptions = {
  globals: {
    'ts-jest': {
      // disable type checking when running tests, speeding them up and making
      // the development experience nicer by not blocking tests on types
      isolatedModules: true
    }
  },

  testEnvironment: 'jsdom',
  setupFilesAfterEnv: [
    '@testing-library/jest-dom/extend-expect',
    './test/setupExpectEachTestHasAssertions.ts'
  ],

  clearMocks: true,
  restoreMocks: true,
  resetMocks: true,

  testRunner: 'jest-circus/runner',

  transformIgnorePatterns: [/<rootDir>\/node_modules\/(?!(ky\/))/u.source],
  transform: {
    [/ky\/index\.js/u.source]: 'ts-jest',
    [/\.tsx?/u.source]: 'ts-jest'
  }
};

export default config;

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