jest.config.ts

import type { Config } from 'jest';

const config: Config = {
    testEnvironment: 'jsdom',
    roots: ['<rootDir>/test'],
    testMatch: ['**/*.test.ts'],
    setupFilesAfterEnv: ['<rootDir>/test/setup-env.ts'],
    moduleFileExtensions: ['ts', 'js', 'json'],
    moduleNameMapper: {
        '^@/(.*)$': '<rootDir>/src/$1',
        '\\.(vert|frag)$': '<rootDir>/test/mocks/text-file.ts',
    },
    transform: {
        '^.+\\.[tj]s$': [
            'ts-jest',
            {
                tsconfig: 'tsconfig.test.json',
            },
        ],
    },
    // earcut 3 ships as ESM only. Jest does not transform node_modules by
    // default, so let ts-jest transpile earcut (and any other ESM-only dep
    // that lands here) alongside our own sources. Scope this list narrowly
    // so the overwhelming majority of node_modules stays un-transformed.
    transformIgnorePatterns: ['/node_modules/(?!(earcut)/)'],
};

export default config;