tsconfig.json

{
	"compilerOptions": {
		// 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 will directly run your TypeScript code, no transpilation needed.
		"noEmit": true,
		// Enable strict type checking.
		"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 possibe 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,
		// Report an error when the value `undefined` is given to an optional property that doesn't specify `undefined` as a valid value.
		"exactOptionalPropertyTypes": true
	}
}