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Discussion on: Using ESLint and Prettier in a TypeScript Project

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gyandeeps profile image
Gyandeep Singh • Edited

Just curious about your opinion on if you need to use a linter to check code if you use typescript in strict mode. For styles, for sure using prettier makes sens to me.

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robertcoopercode profile image
Robert Cooper Author • Edited

Good question. Using a linter allows you to check on a lot of stuff that isn't covered by the TypeScript compiler. For example, if you take a look at some of these ESLint rules for TypeScript code, you'll find a lot of rules related to code style that can be enforced with a linter.

Here are a few examples:

  • @typescript-eslint/explicit-function-return-type: Require explicit return types on functions and class methods
  • @typescript-eslint/generic-type-naming: Enforces naming of generic type variables
  • @typescript-eslint/no-array-constructor: Disallow generic Array constructors
  • @typescript-eslint/no-unused-vars: Disallow unused variables
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gyandeeps profile image
Gyandeep Singh

all of the rules above are again kinda of stylistic (last one is already covered directly by typescript). If something is wrong, typescript will tell u during compile regardless whether you specify function return type explicitly or not.. I also depend on computer types in typescript (maybe thats why i think like this for linter with strict mode)

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robertcoopercode profile image
Robert Cooper Author • Edited

Well if you don't mind having the code written in a project not conform to code style rules, then a linter is of no value. You just might have a large variance in the way code is structured/ordered, variables are named, and other code style related things.

When I'm working on a project, I prefer to look at the code base and have it look like it was all written by the same person. A linter helps achieve this in my opinion.

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braposo profile image
Bernardo Raposo

And there's still things like no explicit any that can be enforced by the linter.

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Corey Alix

This is also a tsconfig option. What use is eslint really? Tsconfig.json and .prettierrc cover most cases as far as I can tell. Is there one compelling use case for eslint?

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robertcoopercode profile image
Robert Cooper Author

There are many eslint rules that aren’t covered by tsconfig options.

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