fix: only access Node.js globals if available

[n1ru4l]

The process object is only available in Node.js and Node.js-like environments (e.g. webpack).

By introducing this simple change, the code can run in a browser environment without requiring polyfilling Node.js APIs such as the following:

<script>
  window.process = globalThis.process = {
    env: {
      NODE_ENV: "development"
    }
  };
</script>

globalThis is part of the ECMA 2020 specification and is supported on any relevant platform.

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis
• https://tc39.es/ecma262/multipage/global-object.html#sec-globalthis
• https://node.green/#ES2020-features-globalThis

The eslint config specifies ecma version 2020 but it seems like the globalThis is not automatically provided. I added the es2020 env. (eslint/eslint#15199 (comment))

---

Closes #2409

[github-actions]

The latest changes of this PR are available on NPM as
graphql@16.3.0-canary.pr.3501.1daccf7bfd7fe9ffeabb319f26aa1b9bf5133e4c
Note: no gurantees provided so please use your own discretion.

Also you can depend on latest version built from this PR:
npm install --save graphql@canary-pr-3501

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[yaacovCR]

To better telegraph the intent in the changelog, you could make this 2 PRs, one updating the eslint with these settings, and a following one with the then-allowed addition of globalThis.

Or, you could rebase these changes into 2 commits that do exactly just that, and then the changes could not be squashed.

But in my meager opinion, that would be gravy and I also approve as is. :)

[saihaj]

@n1ru4l please rebase : )

[n1ru4l]

@saihaj done 🎉