dtype-linter

A tiny, zero-dependency code-style checker for JavaScript.

dtype-linter scans the .js files in your project and reports common formatting issues that quietly hurt readability — overly long lines, trailing whitespace, mixed indentation and empty catch blocks. No config files, no plugins, no setup. Just run it.

Why another linter?

Full-featured linters are powerful but heavy: dozens of transitive dependencies, a config file to maintain and a learning curve. Sometimes you just want a fast, honest check that your code is tidy. dtype-linter does exactly that — and nothing more.

• 🪶 Zero dependencies — a single small script
• ⚡ Instant — no config, no cache, no warm-up
• 📁 Recursive — scans the current folder and subfolders (skips node_modules)
• 🎯 Clear output — every issue as file:line
• 🤖 CI-friendly — exits with code 1 when issues are found

Installation

npm install -g dtype-linter

Usage

Run it from the root of any project:

dtype-linter lint

Example output:

src/app.js:45  line longer than 100 characters
src/db.js:12  trailing whitespace
server.js:8  mixed tabs and spaces

Problems found: 3

When everything is clean:

Clean! No problems found.

The process exits with status 1 if any problems are found, so you can drop it straight into a CI pipeline or a pre-commit hook:

dtype-linter lint || echo "Please fix the issues above before committing."

Rules

| Rule | What it catches | |------|-----------------| | Line length | Lines longer than 100 characters | | Trailing whitespace | Spaces or tabs at the end of a line | | Mixed indentation | Lines that mix tabs and spaces | | Empty catch | catch {} blocks that silently swallow errors |

Notes

dtype-linter is intentionally minimal. It does not rewrite your code, it only reports. For deep static analysis and auto-fixing, reach for a full linter — for a quick tidiness check, this is all you need.

License

ISC