LowFile-scopeJavaScript / TypeScript Plug & play

Mark Properties as readonly If Not Reassigned

Check if properties that are never reassigned are marked as readonly. This improves code clarity and prevents unintended reassignment.

Why this matters

Marking properties as readonly improves code clarity and prevents unintended reassignment.

Side-by-side examples engineers can pattern-match during review.

Avoid

class User {
  title: string = "John";
}

Prefer

class User {
  readonly title: string = "John";
}

Bad

class User {
  title: string = "John";
}

Good

class User {
  readonly title: string = "John";
}

From the same buckets as this rule.

Critical
Avoid Duplicating String Literals
Store repeated string literals in constants or variables to improve maintainability and reduce redundancy.
duplication-complexitymaintainability
Critical
Avoid Empty Methods
Detect methods that have an empty body. If a method is empty, ensure that a comment is present explaining why it remains unimplemented.
maintainabilityreadability-refactor
Critical
Avoid modifying built-in prototypes
Detect modifications to built-in prototypes. Modifying built-in objects can lead to compatibility issues and unexpected behavior. Recommend creating helper functions instead.
maintainabilitysecurity-hardening