{ "extensionsToTreatAsEsm": [".ts", ".tsx"], "moduleNameMapper": { "^(\\.{1,2}/.*)\\.js$": "$1" }, "preset": "ts-jest/presets/default-esm", "testPathIgnorePatterns": ["headless*", "developing.spec.ts"], "transform": { "\\.tsx?$": [ "ts-jest", { "babelConfig": true, "isolatedModules": true, "tsconfig": { "moduleResolution": "node" }, "useESM": true } ] } }