Proposal: Add a Code Formatter

[y-hsgw]

I propose introducing a code formatter, such as Prettier, to ensure consistent code style across the project.
If this sounds reasonable, I can help with the initial setup and configuration of Prettier (or any other preferred formatter).
Let me know your thoughts!😄

[veritem]

I have https://eslint.style/ setup with default configs. Did you find inconsistency anywhere in the repo?

[y-hsgw]

Got it!
It might be possible that the formatting only applies to the .js files.
I think it would be a good idea to apply it to .ts files as well. What do you think?

[veritem]

Does it only format .js files only? It should be both.

[y-hsgw]

Yes, it seems to be applied only to .js files.

For example, when running lint:js, I believe the following link should trigger an @stylistic/quotes error, but it doesn't seem to happen:

eslint-plugin-vitest/src/utils/ast-utils.ts

Lines 1 to 2 in 342ce00

	import { AST_NODE_TYPES, AST_TOKEN_TYPES, TSESLint, TSESTree } from "@typescript-eslint/utils";
	import { createRequire } from "node:module"

It seems that the issue is likely caused by the omission of the files property in the ESLint configuration. I will address this by adding the necessary files property.
https://eslint.org/docs/latest/use/configure/configuration-files#specifying-files-with-arbitrary-extensions