@nx/expo/src/utils/add-jest.js

The Expo Plugin for Nx contains executors and generators for managing and developing an expo application within your workspace. For example, you can directly build for different target platforms as well as generate projects and publish your code.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.addJest = addJest;
const devkit_1 = require("@nx/devkit");
const jest_1 = require("@nx/jest");
async function addJest(host, unitTestRunner, projectName, appProjectRoot, js, skipPackageJson, addPlugin) {
    if (unitTestRunner !== 'jest') {
        return () => { };
    }
    const jestTask = await (0, jest_1.configurationGenerator)(host, {
        js,
        project: projectName,
        supportTsx: true,
        skipSerializers: true,
        setupFile: 'react-native',
        compiler: 'babel',
        skipPackageJson,
        skipFormat: true,
        addPlugin,
    });
    // overwrite the jest.config.ts file because react native needs to have special transform property
    // use preset from https://github.com/expo/expo/blob/main/packages/jest-expo/jest-preset.js
    const configPath = `${appProjectRoot}/jest.config.${js ? 'js' : 'ts'}`;
    const content = `module.exports = {
    displayName: '${projectName}',
    resolver: '@nx/jest/plugins/resolver',
    preset: 'jest-expo',
    moduleFileExtensions: ['ts', 'js', 'html', 'tsx', 'jsx'],
    setupFilesAfterEnv: ['<rootDir>/src/test-setup.${js ? 'js' : 'ts'}'],
    moduleNameMapper: {
      '\\\\.svg$': '@nx/expo/plugins/jest/svg-mock'
    },
    transform: {
      '\\.[jt]sx?$': [
        'babel-jest',
        {
          configFile: __dirname + '/.babelrc.js',
        },
      ],
      '^.+\\.(bmp|gif|jpg|jpeg|mp4|png|psd|svg|webp|ttf|otf|m4v|mov|mp4|mpeg|mpg|webm|aac|aiff|caf|m4a|mp3|wav|html|pdf|obj)$': require.resolve(
        'jest-expo/src/preset/assetFileTransformer.js'
      ),
    },
    coverageDirectory: '${(0, devkit_1.offsetFromRoot)(appProjectRoot)}coverage/${appProjectRoot}'
  };`;
    host.write(configPath, content);
    return jestTask;
}