jest.config.js

// jest.config.js

module.exports = {
  globalSetup: "<rootDir>/jest.global.setup.js",
  setupFiles: ["jest-canvas-mock"],
  setupFilesAfterEnv: ["<rootDir>/jest.setup.js"],
  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>/__mocks__/styleMock.js",

    // Handle image imports
    // https://jestjs.io/docs/webpack#handling-static-assets
    "^.+\\.(jpg|jpeg|png|gif|webp|svg)$": `<rootDir>/__mocks__/fileMock.js`
  },
  testPathIgnorePatterns: ["<rootDir>/node_modules/", "<rootDir>/.next/"],
  transform: {
    // Use babel-jest to transpile tests with the next/babel preset
    // https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object
    "^.+\\.(js|jsx|ts|tsx)$": ["babel-jest", { presets: ["next/babel"] }]
  },
  transformIgnorePatterns: [
    "<rootDir>/node_modules/(?!(d3-selection|d3-zoom|d3-color|d3-geo|d3-array|internmap))",
    "<rootDir>/node_modules/d3-geo/node_modules/(?!(d3-array))",
    "^.+\\.module\\.(css|sass|scss)$"
  ]
};