kcd-scripts/dist/config/jest.config.js

CLI for common scripts for my projects

"use strict";

const path = require('path');
const {
  ifAnyDep,
  hasFile,
  hasPkgProp
} = require('../utils');
const here = p => path.join(__dirname, p);
const useBuiltInBabelConfig = !hasFile('.babelrc') && !hasPkgProp('babel');
const ignores = ['/node_modules/', '/__fixtures__/', '/fixtures/', '/__tests__/helpers/', '/__tests__/utils/', '__mocks__'];

/** @type {import('@jest/types').Config.InitialOptions} */
const jestConfig = {
  roots: ['<rootDir>/src'],
  testEnvironment: ifAnyDep(['webpack', 'rollup', 'react', 'preact'], 'jsdom', 'node'),
  testEnvironmentOptions: {
    url: 'http://localhost'
  },
  moduleFileExtensions: ['js', 'jsx', 'json', 'ts', 'tsx'],
  modulePaths: ['<rootDir>/src', 'shared', '<rootDir>/tests'],
  collectCoverageFrom: ['src/**/*.+(js|jsx|ts|tsx)'],
  testMatch: ['**/__tests__/**/*.+(js|jsx|ts|tsx)'],
  testPathIgnorePatterns: [...ignores],
  coveragePathIgnorePatterns: [...ignores, 'src/(umd|cjs|esm)-entry.js$'],
  transformIgnorePatterns: ['[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$'],
  coverageThreshold: {
    global: {
      branches: 100,
      functions: 100,
      lines: 100,
      statements: 100
    }
  },
  watchPlugins: [require.resolve('jest-watch-typeahead/filename'), require.resolve('jest-watch-typeahead/testname')],
  snapshotSerializers: [require.resolve('jest-serializer-path'), require.resolve('jest-snapshot-serializer-raw/always')]
};
const setupFiles = ['tests/setup-env.js', 'tests/setup-env.ts', 'tests/setup-env.tsx'];
for (const setupFile of setupFiles) {
  if (hasFile(setupFile)) {
    jestConfig.setupFilesAfterEnv = [`<rootDir>/${setupFile}`];
  }
}
if (useBuiltInBabelConfig) {
  jestConfig.transform = {
    '^.+\\.(js|jsx|ts|tsx)$': here('./babel-transform')
  };
}
module.exports = jestConfig;