A fetch function in TypeScript with a type parameter for proper typing.

fetch.ts

export default async function strictFetch<T>(url: string, options?: RequestInit): Promise<T> {
	const res = await fetch(url, options);

	const json = await res.json() as T;

	return json;
}

index.ts

// Example usage.

type Result = {
	name: string;
	description: string;
};

const request = await strictFetch<Result>("https://example.com");

console.log(request.name);
// Example output: "Josh"