Enable Typecheck on CI

[kamiazya]

Problem Details

In Vitest version 1.x, running the following command for typecheck tests causes the process to hang, preventing the tests from completing successfully:

vitest --typecheck

As a result, typecheck tests are currently skipped in the CI environment.

Local Confirmation

Testing with Vitest version 2.x and above locally confirms that the typecheck tests run successfully without hanging.

Proposed Solution

I propose adding a test:type job to the scripts section of the package.json, which will run typecheck tests using Vitest 2.x and above in the CI environment.

"scripts": {
  "test:type": "vitest --typecheck.only"
}

This will ensure that typecheck tests are automatically run in the CI environment, helping to maintain type safety.