ESLint plugin to detect type aliases for primitive types

Issue

In a project that my team is working on, we have type aliases for primitive types. The reason, I got from my team, for this is to have consistency across the codebase.

type FruitName = string;

const fruits: FruitName[] = ['apple', 'banana']

Now, because of this, if I use alias in a function argument, and when I hover on it, my IDE shows that the type is FruitName. It gives a feeling that maybe FruitName is an object instead of a string.

Is there an ESLint plugin that can help to avoid type aliases for primitive types?

Solution

You can use @typescript-eslint/no-type-alias rule like this:

'@typescript-eslint/no-type-alias': ['error', {
  allowAliases: 'in-unions-and-intersections',
  allowConstructors: 'never',
  allowLiterals: 'always',
  allowGenerics: 'always',
  allowTupleTypes: 'always',
  allowMappedTypes: 'always'
}]

See https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/no-type-alias.md

Answered By - Sabrina B.