fix(create-vite): strict checks on vite.config.ts

[nekketsuuu]

Description

After creating a project using create-vite with React and TypeScript, and adding plugin:@typescript-eslint/strict-type-checked according to README.md, rule @typescript-eslint/no-unnecessary-condition throws an error on vite.config.ts when running lint.

/path/to/my-project/vite.config.ts
  0:1  error  This rule requires the `strictNullChecks` compiler option to be turned on to function correctly  @typescript-eslint/no-unnecessary-condition

Here is a small project to reproduce this error: nekketsuuu/vite-config-js-strict@380208d.

That error is because TS strict mode is not enabled at tsconfig.node.json. So, this patch enables the same linting config at tsconfig.node.json as that of https://github.com/vitejs/vite/blob/cd6bf29ca4b677ff0d6e2bf36416a65b1a6ffa21/packages/create-vite/template-react-ts/tsconfig.json.

Also see: 4ffaeee #12604
Follow-up: 2ad78aa #13749

Additional context

Nothing.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[ArnaudBarre]

Hi!
I think this good to improve this small TS config but it will be better to make it more consistent with the rest

• The structure should follow the main one and only diverge for what makes sense for node
• The change should be made too all TS templates

[nekketsuuu]

Hi. Thanks for your advise! Unfortunately, I cannot afford the time to improve all other TS templates. So I'm closing this pr, but feel free to change these configs later.