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For posterity, I was working on improving cloudflare worker integration, but I wasn't able to get it working. Here are things I learned (mainly for future me):

1. You can use conditional exports that cloudflare workers will use specifically:

  "exports": {
    ...
    "worker": {
      "types": "./types/transformers.d.ts",
      "default": "./dist/transformers.js"
    },
    ...
  },

2. Cloudflare workers don't support relative URLs (e.g., new URL('.') is invalid)
3. Cloudflare workers don't support .node addon binaries (Node Addon binaries in Cloudflare Workers? cloudflare/workerd#1905 (comment)). This is unlikely to change in future.
4. Cloudflare workers disable wasm code generation ([🐛 Bug]: WebAssembly.instantiate(): Wasm code generation disallowed by embedder cloudflare/next-on-pages#704) - this is a security consideration and is unlikely to change in future.
5. You can detect cloudflare worker environment simply with typeof globalThis.Cloudflare !== 'undefined'