Initial typescript setup

app/tsconfig.json

@@ -0,0 +1,36 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noFallthroughCasesInSwitch": true,
+
+    /* Paths */
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"]
+    },
+
+    /* Type checking */
+    "allowJs": true,
+    "checkJs": false,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx", "src/**/*.js", "src/**/*.jsx"],
+  "references": [{ "path": "./tsconfig.node.json" }]
+}