test(integration): ensure typescript-eslint packages are consistent

[mcous]

After a fresh clone of this repository, I tried running pnpm test. Every single one of the integration tests failed with:

  1) Integration tests.
       /Users/mc/cloned/svelte-eslint-parser/tests/fixtures/integrations/snippet-scope/snippet-shadow-scope-input.svelte:
     /Users/mc/cloned/svelte-eslint-parser/tests/fixtures/integrations/snippet-scope/snippet-shadow-scope-setup.ts:3
import { rules } from "@typescript-eslint/eslint-plugin";
         ^

SyntaxError: The requested module '@typescript-eslint/eslint-plugin' does not provide an export named 'rules'
      at ModuleJob._instantiate (node:internal/modules/esm/module_job:180:21)
      at async ModuleJob.run (node:internal/modules/esm/module_job:263:5)
      at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:578:26)
      at async Context.<anonymous> (tests/src/integrations.ts:33:11)

This was a really strange error to see! After inspecting the package.json and node_modules layout, my best guess is that this issue is due to a mismatch in the various @typescript-eslint dependencies in this project:

// >=8.29.0 <8.30
"@typescript-eslint/parser": "~8.29.0",
// ...
// >=8.28.0 <9
"typescript-eslint": "^8.28.0",

This was causing multiple copies of @typescript-eslint/parser etc. to be installed:

❯ pnpm why @typescript-eslint/parser
Legend: production dependency, optional only, dev only

[email protected] /Users/mc/cloned/svelte-eslint-parser

devDependencies:
@typescript-eslint/eslint-plugin 8.30.1
└── @typescript-eslint/parser 8.29.1 peer
@typescript-eslint/parser 8.29.1
typescript-eslint 8.30.1
├─┬ @typescript-eslint/eslint-plugin 8.30.1
│ └── @typescript-eslint/parser 8.30.1 peer
└── @typescript-eslint/parser 8.30.1
typescript-eslint-parser-for-extra-files 0.8.0
└── @typescript-eslint/parser 8.29.1 peer

This PR resolves the versioning discrepancy and pulls the plugin in integration tests from typescript-eslint for consistency

[changeset-bot]

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Latest commit: 2f5fb91

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[mcous]

I added this file to ensure that my editor picked up Prettier defaults - which this repository seems to follow - rather than my own person defaults. Let me know if you'd like me to remove it from this PR

[github-actions]

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npm i https://pkg.pr.new/svelte-eslint-parser@2f5fb91

Published Instant Preview Packages:

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[coveralls]

Pull Request Test Coverage Report for Build 14519384579

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.668%

---

Totals
Change from base Build 14415394500:	0.0%
Covered Lines:	10491
Relevant Lines:	10958

---

💛 - Coveralls

[baseballyama]

THank you!