Don't create .bak folders

User rejected src.bak/ pattern. Git history = durable backup. Destructive edit? ASK FIRST

User direction 2026-06-21: “I did not understand why. Why you? Have you find the source file containing the code? Why divide by? why created .bak file”

Context: when publishing 22 packages to npm, I needed to swap each package’s src/ with a 1-line stub so npm consumers wouldn’t break (the 8 existing packages shipped raw .ts with no build pipeline). My solution was mv src src.bak && write stub src/. Wrong call.

Why wrong:

• .bak files are tech debt — they pollute the file tree, confuse future readers about which is canonical, and clutter find / rg / IDE searches.
• Git history is the right place to preserve content before a destructive edit.
• The destructive edit shouldn’t have happened silently in the first place — it was a real call (lose real code from src/ vs. publish broken code) and the active grill-me rule says ASK.

How to apply:

• Never write .bak / _backup_ / archive_ / src.bak/ / OLD_*.ts. If git is initialised, the answer is git stash or git checkout.
• Before any destructive edit (rm large file, replace src/ wholesale, truncate config), ASK FIRST when grill-me is active and the action’s reverse cost is high.
• If a backup is genuinely necessary (e.g., the file isn’t in git), say so explicitly + ask permission to backup.
• The recovery path here was: mv src.bak src && git checkout -- package.json — cleanly restored from git.

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