Run type-checking on types in CI

Author: Methuselah96

.github/workflows/test.yaml

@@ -126,4 +126,5 @@ jobs:
         run: |
           yarn tsc --version
           yarn check-types
+          yarn test:typecheck
           yarn test:types

package.json

@@ -52,6 +52,7 @@
     "test:types": "tsc -p test/typescript && echo \"Typetests passed\"",
     "test:watch": "vitest",
     "test:cov": "vitest --coverage",
+    "test:typecheck": "tsc -p test && echo \"Types passed\"",
     "build": "rollup -c",
     "prepublishOnly": "yarn clean && yarn check-types && yarn format:check && yarn lint && yarn test && yarn build",
     "examples:lint": "eslint --ext js,ts examples",