#no-redundant-type-constituents

#Configuration

import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/no-redundant-type-constituents': 'error',
    },
  },
]);

#Rule Details

Disallow members of unions and intersections that do nothing or override other members.

Some types can override other types in a union or intersection, rendering them redundant. For example, any in a union type overrides all other members, and never in an intersection type overrides all other members. These redundant constituents can be misleading and should be removed.

Examples of incorrect code for this rule:

type Union = any | string;
type Intersection = string & any;
type PrimitiveOverride = string | 'hello';
type NeverUnion = string | never;

Examples of correct code for this rule:

type Union = string | number;
type Intersection = string & { foo: string };
type ValidUnion = string | number | boolean;
type ReturnType = string | never; // allowed in return type position

#Original Documentation

• typescript-eslint no-redundant-type-constituents