Enable typescript/no-unnecessary-type-assertion oxlint rule

[Copilot]

Enables the typescript/no-unnecessary-type-assertion rule to prevent redundant type assertions that don't change the expression type.

Changes

• Added typescript/no-unnecessary-type-assertion: error to .oxlintrc.json

No violations found in the current codebase. The rule will now catch issues like:

const x: number = 5
const y = x as number  // ❌ Error: unnecessary assertion

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• sanity-cdn.com
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/plugins/plugins/dev/test-studio/node_modules/.bin/../sanity/bin/sanity build git k/pl�� --git-common-dir (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Enable the typescript/no-unnecessary-type-assertion oxlint rule</issue_title>
<issue_description>https://oxc.rs/docs/guide/usage/linter/rules/typescript/no-unnecessary-type-assertion
and fix all violations</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Enable the typescript/no-unnecessary-type-assertion oxlint rule #465

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[changeset-bot]

⚠️ No Changeset found

Latest commit: f5db85c

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Project	Deployment	Actions	Updated (UTC)
plugins-studio	Ready	Preview, Comment	Feb 3, 2026 10:31am

[Copilot]

Pull request overview

This PR enables the typescript/no-unnecessary-type-assertion oxlint rule to catch redundant type assertions that don't actually change the expression type, helping maintain cleaner TypeScript code.

Changes:

• Added the typescript/no-unnecessary-type-assertion rule configuration to the oxlint configuration file

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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