Must use import to load ES Module: /github/workspace/eslint-remote-tester-runner-internal.config.ts require() of ES modules is not supported. require() of /github/workspace/eslint-remote-tester-runner-internal.config.ts from /github/workspace/node_modules/.pnpm/eslint-remote-tester@3.0.1_lr4dalshidornieccxpgw4j7yq/node_modules/eslint-remote-tester/dist/config/load.js is an ES module file as it is a .ts file whose nearest parent package.json contains "type": "module" which defines all .ts files in that package scope as ES modules. Instead change the requiring code to use import(), or remove "type": "module" from /github/workspace/package.json.