Prefer Class Properties

Suggestion

small-rules/prefer-class-properties

Prefer class properties to assignment of literals in constructors.

Diagnostic Messages

unexpectedAssignment

Constructor assigns a literal value to this.property. Literals are static and known at class definition time. Move to a class property declaration: propertyName = value; at class level. This clarifies intent and reduces constructor complexity.

unexpectedClassProperty

Class property declarations are disabled by rule configuration (mode: 'never'). Move initialization into the constructor: this.propertyName = value; inside constructor().

Configuration

This rule accepts one options object after the severity.

{
  "jsPlugins": [
    "@pobammer-ts/small-rules"
  ],
  "rules": {
    "small-rules/prefer-class-properties": [
      "error",
      "always"
    ]
  }
}

Examples

Constructor literal class property

class Foo { constructor() { this.foo = 123; } }

Existing class property declaration

class Foo { foo = "bar"; }