mongo/docs/linting.md

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# Linting in the MongoDB codebase
## C++ Linters
### `clang-tidy`
The `buildscripts/clang_tidy.py` shell script runs the `clang-tidy` linter. In order to run
`clang-tidy` you must have a compilation database (`compile_commands.json` file).
Ex: `python3 buildscripts/clang_tidy.py`
| Linter | Configuration File(s) | Help Command | Documentation |
| ------------ | --------------------- | ------------------- | -------------------------------------------------------------------------------------------------------- |
| `clang-tidy` | `.clang-tidy` | `clang-tidy --help` | [https://clang.llvm.org/extra/clang-tidy/index.html](https://clang.llvm.org/extra/clang-tidy/index.html) |
### `errorcodes.py`
The `buildscripts/errorcodes.py` script runs a custom error code linter, which verifies that all
assertion codes are distinct. You can see the usage by running the following command:
`buildscripts/errorcodes.py --help`.
Ex: `buildscripts/errorcodes.py`
### `quickmongolint.py`
The `buildscripts/quickmongolint.py` script runs a simple MongoDB C++ linter. You can see the usage
by running the following command: `buildscripts/quickmongolint.py --help`. You can take a look at
`buildscripts/linter/mongolint.py` to better understand the rules for this linter.
Ex: `buildscripts/quickmongolint.py lint`
## Javascript Linters
The `bazel run lint` command runs the `eslint` javascript linter.
| Linter | Configuration File(s) | Help Command | Documentation |
| -------- | --------------------- | ------------ | ------------------------------------------ |
| `eslint` | `.eslint.config.mjs` | | [https://eslint.org/](https://eslint.org/) |
## Yaml Linters
The `buildscripts/yamllinters.sh` shell script runs the yaml linters. The supported yaml linters
are: `yamllint` & `evergreen-lint`. `evergreen-lint` is a custom MongoDB linter used specifically
for `evergreen` yaml files.
Ex: `bash buildscripts/yamllinters.sh`
| Linter | Configuration File(s) | Help Command | Documentation |
| ---------------- | ------------------------- | --------------------------------- | ---------------------------------------------------------------------------------------------- |
| `yamllint` | `etc/yamllint_config.yml` | `yamllint --help` | [https://readthedocs.org/projects/yamllint/](https://readthedocs.org/projects/yamllint/) |
| `evergreen-lint` | `etc/evergreen_lint.yml` | `python -m evergreen_lint --help` | [https://github.com/evergreen-ci/config-linter](https://github.com/evergreen-ci/config-linter) |
## Python Linters
The `bazel run lint` command runs all Python linters as well as several other linters in our code base. You can
run auto-remediations via:
`bazel run lint --fix`.
Ex: `bazel run lint`
| Linter | Configuration File(s) | Help Command | Documentation |
| ------ | --------------------- | ------------ | ------------------------------------------------------------ |
| `ruff` | `pyproject.toml` | | [https://docs.astral.sh/ruff/](https://docs.astral.sh/ruff/) |