Serve lossless WOFF2 browser fonts outside blocking stylesheets

src/browser-fonts.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "bun:test";
+import { browserFont } from "./browser-fonts";
+test("browser fonts are external WOFF2 files with conditional caching and a fixed allowlist", async () => {
+  const url = "http://localhost/fonts/browser/InstrumentSerif-Regular.woff2";
+  const response = browserFont(new Request(url));
+  expect(response.status).toBe(200);
+  expect(response.headers.get("Content-Type")).toBe("font/woff2");
+  const bytes = new Uint8Array(await response.arrayBuffer());
+  expect(new TextDecoder().decode(bytes.slice(0, 4))).toBe("wOF2");
+  expect(browserFont(new Request(url, { headers: { "If-None-Match": response.headers.get("ETag")! } })).status).toBe(304);
+  expect(browserFont(new Request("http://localhost/fonts/browser/.env")).status).toBe(404);
+  expect(browserFont(new Request("http://localhost/fonts/browser/%2e%2e%2f.env")).status).toBe(404);
+  expect(await browserFont(new Request(url, { method: "HEAD" })).text()).toBe("");
+});