feat: add redirect utility and response catching helper

Author: ttpss930141011

src/lib/redirect.ts

@@ -0,0 +1,14 @@
+export function redirect(url: string, init: ResponseInit | number = 302) {
+	let responseInit = init;
+
+	if (typeof responseInit === "number") {
+		responseInit = { status: responseInit, headers: {} };
+	} else if (!("status" in responseInit)) {
+		responseInit = { ...responseInit, status: 302 };
+	}
+
+	let headers = new Headers(responseInit.headers);
+	headers.set("Location", url);
+
+	return new Response(null, { ...responseInit, headers });
+}

src/test/helpers.ts

@@ -0,0 +1,13 @@
+function isResponse(value: unknown): value is Response {
+	return value instanceof Response;
+}
+
+export async function catchResponse(promise: Promise<unknown>) {
+	try {
+		await promise;
+		throw new Error("Should have failed.");
+	} catch (error) {
+		if (isResponse(error)) return error;
+		throw error;
+	}
+}