mainValidity

Enforces that the main property is valid.

✅ This rule is included in the package-json logical presets.

This rule checks that the main property is a non-empty string.

Examples

❌ Incorrect

{
  "main": ["index.js", "secondary.js"]
}

✅ Correct

{
  "main": "index.js"
}

When Not To Use It

If you don’t need compliance with npm’s main field specification, you can disable this rule. For example, if you use a different package manager that treats the field differently, this rule may not be correct for you.

Related Rules

• mainPresence - Enforces that the main property is present.

Further Reading

• npm: package.json > main

Equivalents in Other Linters

• ESLint: package-json/valid-main