unique-dependencies

💼 This rule is enabled in the following configs: ✅ recommended, 📦 recommended-publishable.

💡 This rule is manually fixable by editor suggestions.

This rule checks that every dependency is just added once to a package.json key specifying dependencies (e.g. dependencies, devDependencies, peerDependencies, optionalDependencies). It also checks that any dependencies declared in the dependencies group, are not also present in peerDependencies or devDependencies.

Examples

❌ Incorrect

{
  "dependencies": {
    "foo": "1.0.0",
    "bar": "2.0.0",
    "foo": "1.0.0"
  }
}

{
  "dependencies": {
    "foo": "1.0.0"
  },
  "devDependencies": {
    "foo": "1.0.0"
  }
}

✅ Correct

{
  "dependencies": {
    "foo": "1.0.0"
  }
}

Related Rules

• valid-dependencies - Enforces that the dependencies property is valid.
• valid-devDependencies - Enforces that the devDependencies property is valid.
• valid-peerDependencies - Enforces that the peerDependencies property is valid.

Further Reading

• npm: package.json > dependencies