Simplify setup (#46)

tsconfig.json

@@ -3,16 +3,48 @@
 	"compilerOptions": {
 		"allowJs": true,
 		"checkJs": true,
-		"esModuleInterop": true,
-		"forceConsistentCasingInFileNames": true,
-		"resolveJsonModule": true,
-		"skipLibCheck": true,
 		"sourceMap": true,
-		"strict": true,
 
-		// Additional Rules
+		// Enable top-level await, and other modern ESM features.
+		"target": "ESNext",
+		"module": "ESNext",
+		// Enable node-style module resolution, for things like npm package imports.
+		"moduleResolution": "node",
+		// Enable JSON imports.
+		"resolveJsonModule": true,
+		// Enable stricter transpilation for better output.
+		"isolatedModules": true,
+		// Astro directly run TypeScript code, no transpilation needed.
+		"noEmit": true,
+		// Report an error when importing a file using a casing different from the casing on disk.
+		"forceConsistentCasingInFileNames": true,
+		// Properly support importing CJS modules in ESM
+		"esModuleInterop": true,
+		// Skip typechecking libraries and .d.ts files
+		"skipLibCheck": true,
+
+		"strict": true,
+		// Error when a value import is only used as a type.
+		"importsNotUsedAsValues": "error",
+
+		// Report errors for fallthrough cases in switch statements
+		"noFallthroughCasesInSwitch": true,
+		// Force functions designed to override their parent class to be specified as `override`.
+		"noImplicitOverride": true,
+		// Force functions to specify that they can return `undefined` if a possible code path does not return a value.
+		"noImplicitReturns": true,
+		// Report an error when a variable is declared but never used.
+		"noUnusedLocals": true,
+		// Report an error when a parameter is declared but never used.
+		"noUnusedParameters": true,
+		// Force the usage of the indexed syntax to access fields declared using an index signature.
 		"noUncheckedIndexedAccess": true,
-		"noEmit": true
+		// Report an error when the value `undefined` is given to an optional property that doesn't specify `undefined` as a valid value.
+		"exactOptionalPropertyTypes": false,
+		// Report an error for unreachable code instead of just a warning.
+		"allowUnreachableCode": false,
+		// Report an error for unused labels instead of just a warning.
+		"allowUnusedLabels": false
 	}
 	// Path aliases are handled by https://kit.svelte.dev/docs/configuration#alias
 	//