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perf: drop @ampproject/toolbox-optimizer to reduce the server bundle size #700

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Merged
merged 1 commit into from
Jun 5, 2025
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perf: drop @ampproject/toolbox-optimizer to reduce the server bundle size #700

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5 changes: 5 additions & 0 deletions .changeset/four-wombats-serve.md
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---
"@opennextjs/cloudflare": patch
---

perf: drop `@ampproject/toolbox-optimizer` to reduce the server bundle size
24 changes: 12 additions & 12 deletions packages/cloudflare/src/cli/build/bundle-server.ts
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Expand Up @@ -106,24 +106,24 @@ export async function bundleServer(buildOpts: BuildOptions): Promise<void> {
] as Plugin[],
external: ["./middleware/handler.mjs"],
alias: {
// Note: it looks like node-fetch is actually not necessary for us, so we could replace it with an empty shim
// but just to be safe we replace it with a module that re-exports the native fetch
// we do this to both save on bundle size (there isn't really any benefit in us shipping the node-fetch code)
// and also get rid of a warning in the terminal caused by the package (because it performs an === comparison with -0)
// Workers have `fetch` so the `node-fetch` polyfill is not needed
"next/dist/compiled/node-fetch": path.join(buildOpts.outputDir, "cloudflare-templates/shims/fetch.js"),
// Note: we apply an empty shim to next/dist/compiled/ws because it generates two `eval`s:
// eval("require")("bufferutil");
// eval("require")("utf-8-validate");
// Workers have builtin Web Sockets
"next/dist/compiled/ws": path.join(buildOpts.outputDir, "cloudflare-templates/shims/empty.js"),
// Note: we apply an empty shim to next/dist/compiled/edge-runtime since (amongst others) it generated the following `eval`:
// eval(getModuleCode)(module, module.exports, throwingRequire, params.context, ...Object.values(params.scopedContext));
// which comes from https://github.com/vercel/edge-runtime/blob/6e96b55f/packages/primitives/src/primitives/load.js#L57-L63
// The toolbox optimizer pulls severals MB of dependencies (`caniuse-lite`, `terser`, `acorn`, ...)
// Drop it to optimize the code size
// See https://github.com/vercel/next.js/blob/6eb235c/packages/next/src/server/optimize-amp.ts
"next/dist/compiled/@ampproject/toolbox-optimizer": path.join(
buildOpts.outputDir,
"cloudflare-templates/shims/throw.js"
),
// The edge runtime is not supported
"next/dist/compiled/edge-runtime": path.join(
buildOpts.outputDir,
"cloudflare-templates/shims/empty.js"
),
// `@next/env` is a library Next.js uses for loading dotenv files, for obvious reasons we need to stub it here
// source: https://github.com/vercel/next.js/tree/0ac10d79720/packages/next-env
// `@next/env` is used by Next to load environment variables from files.
// OpenNext inlines the values at build time so this is not needed.
"@next/env": path.join(buildOpts.outputDir, "cloudflare-templates/shims/env.js"),
},
define: {
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2 changes: 2 additions & 0 deletions packages/cloudflare/src/cli/templates/shims/throw.ts
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throw "OpenNext shim";
export default {};