The official document says about next-env.d.ts, "As such this file should not be committed and should be ignored by version control.". However, after executing npx create-next-app --ts, generated .gitignore omits next-env.d.ts. Some developers add next-env.d.ts to .gitignore manually. So, it would be better if the .gitignore template of create-next-app had next-env.d.ts.
Feel free to close if this change is wrong.

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