wallaby.jest.js

/*
 * NB: to get this working you will need to
 * 1. copy a test-setup.ts file from one of the apps that uses Jest to the root of your project
 * 2. replace YOUR_WORK_SPACE_NAME with the name of your work space on line 68
 */

const path = require('path');

const angularConfig = require('./angular.json');
const excludingE2E = Object.keys(angularConfig.projects)
  .map(key => ({ ...angularConfig.projects[key], id: key }))
  .filter(project => !project.id.includes('-e2e'));

const onlyJest = excludingE2E.filter(project =>
  project.architect.test.builder.includes('jest')
);

const filesBlueprints = [
  {
    prefix: '',
    postfix: '**/*.+(ts|html|json|snap|css|less|sass|scss|jpg|jpeg|gif|png|svg)'
  },
  { prefix: '!', postfix: '**/*.spec.ts' }
];

const files = onlyJest.reduce(
  (accumulator, project) => [
    ...accumulator,
    ...filesBlueprints.map(blueprint =>
      path.join(blueprint.prefix, project.sourceRoot, blueprint.postfix)
    )
  ],
  ['test-setup.ts', 'jest.config.js']
);

const tests = [...onlyJest.map(
  ({sourceRoot}) => path.join(sourceRoot, '**/*.spec.ts')
), '!apps/*-e2e/**/*.spec.ts'];

const ngxWallabyJest = require('ngx-wallaby-jest');

module.exports = function(wallaby) {
  return {
    files,

    tests,

    env: {
      type: 'node',
      runner: 'node'
    },
    compilers: {
      '**/*.ts?(x)': wallaby.compilers.typeScript({ module: 'commonjs' })
    },
    preprocessors: {
      // This translate templateUrl and styleUrls to the right implementation
      // For wallaby
      'apps/**/*.component.ts': ngxWallabyJest,
      'libs/**/*.component.ts': ngxWallabyJest
    },
    testFramework: 'jest',

    setup: function(wallaby) {
      var jestConfig = require('./jest.config');
      jestConfig.setupTestFrameworkScriptFile = '<rootDir>/test-setup.js';

      jestConfig.moduleNameMapper = {
        '@YOUR_WORK_SPACE_NAME/(.*)': `${wallaby.localProjectDir}libs/$1/src` 
      };

      wallaby.testFramework.configure(jestConfig);
    }
  };
};

With Nx 8, I'm seeing an error similar to this:
Error: Cannot find module '@workspace/lib' from 'foo.js'

Any luck running this on Nx 8?

Just figured it out:

setup: function(wallaby) {
  var jestConfig = require('./jest.config');
  jestConfig.setupTestFrameworkScriptFile = '<rootDir>/test-setup.js';

  jestConfig.moduleNameMapper = {
    '@workspace/(.*)': `${wallaby.localProjectDir}libs/$1/src`
  };

  wallaby.testFramework.configure(jestConfig);
},