feat: add ignoreClassWithStaticInitBlock option to no-unused-vars

[Tanujkanti4441]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[x] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What rule do you want to change?
no-unused-vars

What change do you want to make (place an "X" next to just one item)?

[ ] Generate more warnings
[x] Generate fewer warnings
[ ] Implement autofix
[ ] Implement suggestions

How will the change be implemented (place an "X" next to just one item)?

[x] A new option
[ ] A new default behavior
[ ] Other

Please provide some example code that this change will affect:

/* eslint no-unused-vars: "error" */

class ClassWithSIB {
  static {
    // …
  }
}

What does the rule currently do for this code?
rule reports this code.

What will the rule do after it's changed?
rule will not report the classes as unused that have static initialization block.

What changes did you make? (Give an overview)

added a new option called ignoreClassWithStaticInitBlock that is a boolean and by default it is false

Is there anything you'd like reviewers to focus on?

Fixes: #17772

[netlify]

✅ Deploy Preview for docs-eslint ready!

Name	Link
🔨 Latest commit	63839c6
🔍 Latest deploy log	https://app.netlify.com/sites/docs-eslint/deploys/65e94f283d1add00083a522b
😎 Deploy Preview	https://deploy-preview-18170--docs-eslint.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[nzakas]

LGTM. Can you also please update the documentation?

[mdjermanovic]

Suggested change

	const hasStaticBlock = def.node.body.body.filter(node => node.type === "StaticBlock");
	const hasStaticBlock = def.node.body.body.some(node => node.type === "StaticBlock");

filter always returns an array, so this would always be truthy.

/* eslint no-unused-vars: ["error", { ignoreClassWithStaticInitBlock: true }] */

class C {} // false negative

We should also add some tests where this option is true and class doesn't have static blocks.

[Tanujkanti4441]

Done!

[nzakas]

LGTM. Would like @mdjermanovic to review before merging.

[nzakas]

Just cleaning up the language a bit.

Suggested change

The `ignoreClassWithStaticInitBlock` option is a boolean (default: `false`). Static initialization blocks or Static blocks was introduced in ES2022. Static blocks lets us to initialize static variables and execute code during the evaluation of defined class. It means that one don't need to create an instance of class to run the code written inside the static block. This option ignore the classes with static initialization block when sets to `true`.

The `ignoreClassWithStaticInitBlock` option is a boolean (default: `false`). Static initialization blocks allow you to initialize static variables and execute code during the evaluation of a class definition, meaning the static block code is executed without creating a new instance of the class. When set to `true`, this option ignores classes containing static initialization blocks.

[Tanujkanti4441]

Done!

[mdjermanovic]

LGTM, thanks!