chore: setup typecheck scripts for each package

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

packages/core/tsconfig.json

@@ -1,13 +1,34 @@
 {
   "compilerOptions": {
-    "lib": ["dom"],
+    "lib": ["dom", "ESNext"],
     "target": "ESNext",
-    "module": "ESNext",
+    "module": "preserve",
     "moduleResolution": "bundler",
     "paths": {
       "@/*": ["./src/*"]
     },
     "strict": true,
-    "noEmit": true
-  }
+    "noEmit": true,
+
+    // Environment setup & latest features
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+
+    // Best practices
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  },
+  "include": ["./src", "./test"]
 }