🐛 Bug Report

When using immer.esm.js on browser. We get
Uncaught ReferenceError: process is not defined

<script type="module" src="./testESM.js"></script>

import { produce } from "https://unpkg.com/immer@6.0.2/dist/immer.esm.js";

Declaring the variable ahead of time fixes the issue.

<script>
  let process = {
    env: {
      NODE_ENV: "production"
    }
  };
</script>

Link to repro

Couldn't use code-sandbox because it wanted to import all modules as
node modules instead of as an esm module.
repo

To Reproduce

npm install . && npm test

Observed behavior

On import, throws
Uncaught ReferenceError: process is not defined

Expected behavior

Not throwing an exception

Environment

We only accept bug reports against the latest Immer version.

• Immer version: latest
• N/A Occurs with setUseProxies(true)
• N/A Occurs with setUseProxies(false) (ES5 only)