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M. Safarian
M. Safarian

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Your .gitignore Is Probably Doing Too Much

#webdev #programming #tutorial #git

Your .gitignore Is Probably Doing Too Much

Have you ever opened a pull request and found dozens of unrelated files?

Maybe it was your IDE settings:

.idea/
.vscode/
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or operating system files:

.DS_Store
Thumbs.db
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or temporary files created only on your machine.

Most developers solve this by adding everything to the project's .gitignore.

It works. But it creates another problem.

Your project's .gitignore slowly becomes a collection of every developer's personal preferences instead of a description of the project itself.

"I have seen .gitignore files with 200+ lines. Half of them were not related to the project at all. They were just personal preferences copied from someone's computer."

Not every ignored file belongs to the project

A common misunderstanding about .gitignore is thinking:

"If Git should ignore it, it belongs in the project's .gitignore."

That is not always true.

A better question is:

"Does this file matter to every developer working on this project?"

If the answer is yes, it belongs in the project's .gitignore.

If the answer is no, it probably belongs somewhere else.

Separate project files from personal files

Think about two different categories.

Project-specific files

These are files that are related to how the project works.

Examples:

node_modules/
dist/
build/
.env
coverage/
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Every developer who clones the repository should understand why these files are ignored.

They are part of the project's workflow.

Personal machine files

These files are created because of your tools, operating system, or personal workflow.

Examples:

.DS_Store
.idea/
.vscode/
*.swp
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These files are not part of the application.

Your teammate using VS Code does not need your IntelliJ settings. Your teammate using Linux does not need your macOS files.

These rules belong to your environment, not the project.

Use a global .gitignore for personal files

Git provides a global ignore file that applies to all repositories on your computer.

Create one:

touch ~/.gitignore_global
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Configure Git:

git config --global core.excludesfile ~/.gitignore_global
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Now add your personal rules:

# Operating systems
.DS_Store
Thumbs.db

# Editors
.idea/
.vscode/
*.swp

# Temporary files
*~
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These rules will apply to every repository you work with.

Three levels of Git ignoring

Git gives you different places for different responsibilities.

Global .gitignore
        |
        |-- Personal machine rules
        |-- IDE files
        |-- OS files


Project .gitignore
        |
        |-- Team/project rules
        |-- Dependencies
        |-- Build output
        |-- Generated files


.git/info/exclude
        |
        |-- Repository-specific personal experiments
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Choosing the correct place keeps repositories cleaner.

A simple rule to remember

Before adding something to .gitignore, ask:

"Would another developer cloning this repository need this rule?"

If yes:

Add it to the project .gitignore
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If no:

Add it to your global .gitignore
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Why this matters

A clean .gitignore improves collaboration.

It makes code reviews easier because developers see meaningful changes instead of unrelated files.

It keeps the repository focused on the application, not someone's local setup.

It also prevents teams from constantly modifying .gitignore every time someone uses a different editor or operating system.

Final thoughts

.gitignore is not just a list of files Git should ignore.

It is a boundary that defines what belongs to the project and what belongs to an individual developer's environment.

A good repository is not one that ignores everything.

A good repository knows what it owns.

What files do you keep in your global .gitignore? Do you prefer ignoring IDE files globally or inside each project?

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