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The key "<your key>" under "env" in `next.config.js` is not allowed. |
Next.js configures internal variables for replacement itself. NEXT_RUNTIME along with variables starting with __ or NODE_ are currently internal, for this reason they are not allowed as values for env in next.config.js
Rename the specified key so that it does not start with __ or NODE_, or pick another name for NEXT_RUNTIME.