Switch code size benchmark to use fflate

Makefile

@@ -245,6 +245,5 @@ release: all ## Release @bufbuild/protobuf
 
 .PHONY: checkdiff
 checkdiff:
-	@# Used in CI to verify that `make` doesn't produce a diff, but ignore changes in benchmarks
-	git checkout packages/protobuf-bench/README.md
+	@# Used in CI to verify that `make` doesn't produce a diff
 	test -z "$$(git status --porcelain | tee /dev/stderr)"

packages/protobuf-bench/README.md

@@ -10,5 +10,5 @@ server would usually do.
 
 | code generator      | bundle size             | minified               | compressed         |
 |---------------------|------------------------:|-----------------------:|-------------------:|
-| protobuf-es         | 86,785 b      | 36,950 b | 9,654 b |
-| protobuf-javascript | 394,384 b  | 288,775 b | 45,201 b |
+| protobuf-es         | 86,785 b      | 36,950 b | 11,079 b |
+| protobuf-javascript | 394,384 b  | 288,775 b | 54,825 b |

packages/protobuf-bench/package.json

@@ -9,6 +9,7 @@
     "@bufbuild/buf": "^1.14.0-1",
     "@bufbuild/protobuf": "1.0.0",
     "esbuild": "^0.17.10",
+    "fflate": "^0.7.4",
     "google-protobuf": "3.21.2"
   }
 }

packages/protobuf-bench/report.mjs

@@ -1,5 +1,5 @@
 import { buildSync } from "esbuild";
-import { brotliCompressSync } from "zlib";
+import { gzipSync } from "fflate";
 
 const protobufEs = gather("src/entry-protobuf-es.ts");
 const googleProtobuf = gather("src/entry-google-protobuf.js");
@@ -23,7 +23,11 @@ server would usually do.
 function gather(entryPoint) {
   const bundle = build(entryPoint, false, "esm");
   const bundleMinified = build(entryPoint, true, "esm");
-  const compressed = compress(bundleMinified);
+  const compressed = gzipSync(bundleMinified, {
+    mtime: 0,
+    level: 6,
+    mem: 6,
+  });
   return {
     entryPoint,
     size: formatSize(bundle.byteLength),
@@ -47,10 +51,6 @@ function build(entryPoint, minify, format) {
   return result.outputFiles[0].contents;
 }
 
-function compress(buf) {
-  return brotliCompressSync(buf);
-}
-
 function formatSize(bytes) {
   return new Intl.NumberFormat().format(bytes) + " b";
 }