fix(static): honor zero encoding quality

Author: MFA-G

src/runtime/internal/static.ts

@@ -21,7 +21,15 @@ export default defineHandler((event) => {
   const encodings = [
     ...encodingHeader
       .split(",")
-      .map((e) => EncodingMap[e.trim().split(";")[0].trim() as keyof typeof EncodingMap])
+      .map((entry) => {
+        const [name, ...parameters] = entry.split(";");
+        const quality = parameters
+          .map((parameter) => parameter.trim().split("="))
+          .find(([key]) => key.toLowerCase() === "q")?.[1];
+        return quality !== undefined && Number(quality) === 0
+          ? undefined
+          : EncodingMap[name.trim() as keyof typeof EncodingMap];
+      })
       .filter(Boolean)
       .sort(),
     "",

test/unit/static-middleware.test.ts

@@ -85,4 +85,34 @@ describe("runtime static middleware", () => {
     expect(readAsset).toHaveBeenCalledWith("/foo.css.gz");
     expect(event.res.headers.get("Content-Encoding")).toBe("gzip");
   });
+
+  it("does not match compressed assets with zero quality", async () => {
+    getAsset.mockImplementation((id: string) => {
+      if (id === "/foo.css.gz") {
+        return {
+          etag: '"compressed"',
+          mtime: "2024-01-01T00:00:00.000Z",
+          size: 4,
+          type: "text/css",
+          encoding: "gzip",
+        };
+      }
+      if (id === "/foo.css") {
+        return {
+          etag: '"plain"',
+          mtime: "2024-01-01T00:00:00.000Z",
+          size: 4,
+          type: "text/css",
+        };
+      }
+      return undefined;
+    });
+    readAsset.mockResolvedValue("body");
+    const event = createEvent("/foo.css", "gzip; q=0.0");
+
+    await handler(event);
+
+    expect(readAsset).toHaveBeenCalledWith("/foo.css");
+    expect(event.res.headers.get("Content-Encoding")).toBeNull();
+  });
 });