Add warning for ts-node/esm usage #5381
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DavertMik
requested changes
Jan 15, 2026
| return ` | ||
| ⚠️ Warning: ts-node/esm with "module": "esnext" requires explicit file extensions in all imports. | ||
| This is a known limitation. Use tsx/cjs instead to write imports without extensions. |
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Please add an example here
Which import is OK which is not OK
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Problem
When using
ts-node/esmwith"module": "esnext"in tsconfig.json, users get "Cannot find module" errors because imports without file extensions don't work.This is a known limitation of
ts-node/esm, not a bug in CodeceptJS, but users don't understand what's happening. #5323Solution
Add a warning message when
ts-node/esmis detected in the config. The warning:tsx/cjsas an alternative