No Useless Constants

ErrorAuto-fixable

small-rules/no-useless-constants

Disallow constants that do not add value.

Diagnostic Messages

uselessConstant

Constant '{{name}}' is only referenced once in the same scope. Inline it directly, or move it to a higher scope if reference stability is needed.

uselessConstantNoFix

Constant '{{name}}' is only referenced once in the same scope. It cannot be auto-inlined because the initializer is not safely movable or the declaration has attached comments. Inline it manually, or move it to a higher scope if reference stability is needed.

uselessConstants

Constants '{{names}}' are only referenced once in the same scope. Inline them directly, or move them to a higher scope if reference stability is needed.

Configuration

This rule accepts one options object after the severity.

ignoreCallPatternsOptional

Regular expression patterns for call expressions that should be ignored.

Type

Array<string>

Default

6 ignore call patterns

{
  "jsPlugins": [
    "@pobammer-ts/small-rules"
  ],
  "rules": {
    "small-rules/no-useless-constants": [
      "error",
      {
        "ignoreCallPatterns": [
          "^Array\\b",
          "^Object\\b",
          "^Map\\b",
          "^Set\\b",
          "^WeakMap\\b",
          "^WeakSet\\b"
        ]
      }
    ]
  }
}

Examples

Inline adjacent constant

const TITLE_OFFSET = 225;
const TEXT_NATIVE = { Offset: TITLE_OFFSET };

After auto-fix

const TEXT_NATIVE = { Offset: 225 };

Already inlined constant

const TEXT_NATIVE = { Offset: 225 };

Related Rules

Prefer Module Scope ConstantsRelatedOne inlines single-use constants; the other places SCREAMING_SNAKE constants at module scope.