feat: Add type checking and update tsconfig

Adds a type-checking script to package.json and updates tsconfig.json to
improve type checking and skip library checks.

feat: Add type checking and update tsconfig

Adds a type-check script to `package.json` and a pre-push hook to run
type checks before pushing. Updates the `tsconfig.json` to include
`vitest/globals` and `skipLibCheck`. Also, updates imports in test files
to include the `.js` extension.

.husky/pre-push

···
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npm run type-check

package.json

···
     "test:ui": "vitest --ui",
     "test:run": "vitest run",
     "test:coverage": "vitest run --coverage",
+    "type-check": "tsc --noEmit",
     "format": "bunx prettier --write .",
     "lint": "bunx eslint .",
     "lint:fix": "bunx eslint --fix .",

src/tests/agent.test.ts

···
       }
     }))
 
-    const { agent, login } = await import('../agent')
+    const { agent, login } = await import('../agent.js')
 
     // Check that the agent was created with the correct service URL
     expect(mockConstructor).toHaveBeenCalledWith({ service: 'https://pds.test.com' })

src/tests/limits.test.ts

···
 import { describe, it, expect } from 'vitest'
-import { limit } from '../limits'
+import { limit } from '../limits.js'
 
 describe('Rate Limiter', () => {
   it('should limit the rate of calls', async () => {

src/tests/metrics.test.ts

···
 import { describe, it, expect } from 'vitest'
 import request from 'supertest'
-import { startMetricsServer } from '../metrics'
+import { startMetricsServer } from '../metrics.js'
 import { Server } from 'http'
 
 describe('Metrics Server', () => {

src/utils/homoglyph.test.ts

···
 import { describe, it, expect } from 'vitest'
-import { normalizeUnicode } from './normalizeUnicode'
+import { normalizeUnicode } from './normalizeUnicode.js'
 
 describe('normalizeUnicode with Homoglyphs', () => {
   it('should replace basic homoglyphs', () => {

tsconfig.json

···
     "moduleResolution": "NodeNext",
     "allowSyntheticDefaultImports": true,
     "esModuleInterop": true,
-    "types": ["node"]
+    "skipLibCheck": true,
+    "types": ["node", "vitest/globals"]
   }
 }