jest.preset.js

module.exports = {
  collectCoverageFrom: ["**/*.{js,jsx,ts,tsx}", "!**/*.d.ts", "!**/node_modules/**"],
  moduleNameMapper: {
    /* Handle CSS imports (with CSS modules)
      https://jestjs.io/docs/webpack#mocking-css-modules */
    "^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy",

    // Handle CSS imports (without CSS modules)
    "^.+\\.(css|sass|scss)$": "<rootDir>/src/__mocks__/styleMock.js",

    /* Handle image imports
      https://jestjs.io/docs/webpack#handling-static-assets */
    "^.+\\.(jpg|jpeg|png|gif|webp|svg)$": "<rootDir>/src/__mocks__/fileMock.js",
  },
  testPathIgnorePatterns: ["<rootDir>/dist/", "<rootDir>/node_modules/"],
  testEnvironment: "node",
  transform: {
    /* Use babel-jest to transpile tests with the next/babel preset
      https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object */
    "^.+\\.(js|jsx|ts|tsx)$": ["ts-jest"],
  },
  transformIgnorePatterns: ["/node_modules/", "^.+\\.module\\.(css|sass|scss)$"],
  watchPlugins: ["jest-watch-typeahead/filename", "jest-watch-typeahead/testname"],
  roots: ["<rootDir>/src/", "<rootDir>"],
}