Checklists for software errors, setup, and tool workflows.

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Fix npm run build Failure from Missing Env Variables

You run npm run build and get an error like Error: Missing required environmen...

Fix VS Code 'Permission Denied' When Saving Files
You're editing a file in Visual Studio Code, hit Ctrl+S, and get an error: "Failed to sav...

Prevent Git Index Lock File Creation: Practical Fixes
If you see fatal: Unable to create 'path/to/.git/index.lock': File exists., ...

Fix Chrome Certificate Error Invalid Authority on Mac
You're browsing in Chrome on a Mac and suddenly see a warning: Your connection is not...

Node.js Garbage Collection Tuning to Avoid Heap Out of Memory
If your Node.js process crashes with a FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed -...

Fix Firefox Secure Connection Failed Not Loading
If Firefox shows a “Secure Connection Failed” error and won’t let you load a site, it usually mea...

Checklists for software errors, setup, and tool workflows.

Latest checklists

Fix npm run build Failure from Missing Env Variables

Fix VS Code 'Permission Denied' When Saving Files

Prevent Git Index Lock File Creation: Practical Fixes

Fix Chrome Certificate Error Invalid Authority on Mac

Node.js Garbage Collection Tuning to Avoid Heap Out of Memory

Fix Firefox Secure Connection Failed Not Loading

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