jest.config.js

module.exports = {
	collectCoverage: true,
	// on node 14.x coverage provider v8 offers good speed and more or less good report
	coverageProvider: 'v8',
	collectCoverageFrom: [
		'**/*.{js,jsx,ts,tsx}',
		'!**/*.d.ts',
		'!**/node_modules/**',
		'!<rootDir>/out/**',
		'!<rootDir>/.next/**',
		'!<rootDir>/*.config.js',
		'!<rootDir>/coverage/**',
	],
	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
		'^.+\\.(png|jpg|jpeg|gif|webp|avif|ico|bmp|svg)$/i': `<rootDir>/__mocks__/fileMock.js`,

		// Handle module aliases
		'^@/components/(.*)$': '<rootDir>/components/$1',

		// Handle @next/font
		'@next/font/(.*)': `<rootDir>/__mocks__/nextFontMock.js`,
		// Handle next/font
		'next/font/(.*)': `<rootDir>/__mocks__/nextFontMock.js`,
		// Disable server-only
		'server-only': `<rootDir>/__mocks__/empty.js`,
	},
	// Add more setup options before each test is run
	// setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
	testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/.next/'],
	testEnvironment: 'jsdom',
	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)$': ['babel-jest', { presets: ['next/babel'] }],
	},
	transformIgnorePatterns: ['/node_modules/', '^.+\\.module\\.(css|sass|scss)$'],
};