Sherif: Opinionated, zero-config linter for JavaScript monorepos

About

Sherif is an opinionated, zero-config linter for JavaScript monorepos. It runs fast in any monorepo and enforces rules to provide a better, standardized DX.

Features

• ✨ PNPM, NPM, Yarn...: sherif works with all package managers
• 🔎 Zero-config: it just works and prevents regressions
• ⚡ Fast: doesn't need node_modules installed, written in 🦀 Rust

Installation

Run sherif in the root of your monorepo to list the found issues. Any error will cause Sherif to exit with a code 1:

1# PNPM
2pnpm dlx sherif@latest
3# NPM
4npx sherif@latest

We recommend running Sherif in your CI once all errors are fixed. Run it by specifying a version instead of latest. This is useful to prevent regressions (e.g. when adding a library to a package but forgetting to update the version in other packages of the monorepo).

When using the GitHub Action, it will search for a sherif script in the root package.json and use the same arguments automatically to avoid repeating them twice. You can override this behaviour with the args parameter.

1# Using the `QuiiBz/sherif` action
2name: Sherif
3on:
4  pull_request:
5jobs:
6  check:
7    name: Run Sherif
8    runs-on: ubuntu-22.04
9    steps:
10      - uses: actions/checkout@v4
11      - uses: QuiiBz/sherif@v1
12        # Optionally, you can specify a version and arguments to run Sherif with:
13        # with:
14          # version: 'v1.6.1'
15          # args: '--ignore-rule root-package-manager-field'
16
17# Using `npx` to run Sherif
18name: Sherif
19on:
20  pull_request:
21jobs:
22  check:
23    name: Run Sherif
24    runs-on: ubuntu-22.04
25    steps:
26      - uses: actions/checkout@v4
27      - uses: actions/setup-node@v3
28        with:
29          node-version: 20
30      - run: npx sherif@1.6.1

Autofix

Most issues can be automatically fixed by using the --fix (or -f) flag. Sherif will automatically run your package manager's install command (see No-install mode to disable this behavior) to update the lockfile. Note that autofix is disabled in CI environments (when $CI is set):

1sherif --fix

Autofixing the multiple-dependency-versions rule

By default, running --fix with the multiple-dependency-versions rule will ask you to select which version to use for each dependency with multiple versions across the monorepo. If that doesn't work for you (e.g., you are running Sherif in a non-interactive environment), you can use the --select (of -s) flag to automatically select the highest or lowest version of every dependency:

1# Autofix and select the highest version for each dependency matching the `multiple-dependency-versions` rule
2sherif --fix --select highest

No-install mode

If you don't want Sherif to run your packager manager's install command after running autofix, you can use the --no-install flag:

1# Autofix without running the package manager's install command
2sherif --fix --no-install

Rules

You can ignore a specific rule by using --ignore-rule <name> (or -r <name>):

1# Ignore both rules
2sherif -r packages-without-package-json -r root-package-manager-field

You can ignore all issues in a package by using --ignore-package <pathOrName> (or -p <pathOrName>):

1# Ignore all issues in the `@repo/tools` package
2sherif -p @repo/tools
3# Ignore all issues for packages inside `./integrations/*`
4sherif -p "./integrations/*"

empty-dependencies ❌

package.json files should not have empty dependencies fields.

multiple-dependency-versions ❌

A given dependency should use the same version across the monorepo.

You can ignore this rule for a specific dependency and version or all versions of a dependency if it's expected in your monorepo by using --ignore-dependency <name@version> / --ignore-dependency <name> (or -i <name@version> / -i <name>):

1# Ignore only the specific dependency version mismatch
2sherif -i react@17.0.2 -i next@13.2.4
3
4# Ignore all versions mismatch of dependencies that start with @next/
5sherif -i @next/*
6
7# Completely ignore all versions mismatch of these dependencies
8sherif -i react -i next

unsync-similar-dependencies ❌

Similar dependencies in a given package.json should use the same version. For example, if you use both react and react-dom dependencies in the same package.json, this rule will enforce that they use the same version.

non-existant-packages ⚠️

All paths defined in the workspace (the root package.json' workspaces field or pnpm-workspace.yaml) should match at least one package.

packages-without-package-json ⚠️

All packages matching the workspace (the root package.json' workspaces field or pnpm-workspace.yaml) should have a package.json file.

root-package-dependencies ⚠️

The root package.json is private, so making a distinction between dependencies and devDependencies is useless - only use devDependencies.

root-package-manager-field ❌

The root package.json should specify the package manager and version to use. Useful for tools like corepack.

root-package-private-field ❌

The root package.json should be private to prevent accidentaly publishing it to a registry.

types-in-dependencies ❌

Private packages shouldn't have @types/* in dependencies, since they don't need it at runtime. Move them to devDependencies.

unordered-dependencies ❌

Dependencies should be ordered alphabetically to prevent complex diffs when installing a new dependency via a package manager.

Credits

• dedubcheck that given me the idea for Sherif
• Manypkg for some of their rules
• This article for the Rust releases on NPM

Sponsors

License

MIT