ci(typecheck): only enable skipLibCheck in CI

Disabling `skipLibCheck` prevents `tsserver` from type checking all `d.ts`
files.
Since we author these files manually, it's better to enable type
checking for these files within IDEs to avoid human errors.
We still disable typechecking in `d.ts` files in CI since we have errors
in third party `d.ts` files.

Author: florian-sanders-cc

package.json

@@ -90,7 +90,7 @@
     "test:e2e": "npm run test:e2e:browser && npm run test:e2e:node",
     "test:e2e:browser": "web-test-runner --config test-browser-wtr.config.e2e.js",
     "test:e2e:node": "mocha --config test-node-mocha.config.e2e.cjs",
-    "typecheck": "tsc -p tsconfig.json"
+    "typecheck": "tsc -p tsconfig.ci.json"
   },
   "dependencies": {
     "component-emitter": "^1.3.0",

tsconfig.ci.json

@@ -0,0 +1,6 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "skipLibCheck": true
+  }
+}

tsconfig.json

@@ -9,7 +9,7 @@
     "checkJs": true,
     "noEmit": true,
     "esModuleInterop": true,
-    "skipLibCheck": true,
+    "skipLibCheck": false,
     "strict": true,
     "strictNullChecks": false,
     "noUncheckedIndexedAccess": false,