platform is undefined

[domino14]

Describe the bug

platform is undefined

To Reproduce
Steps to reproduce the behavior:

1. Create an index.js script that looks like:

import { platform } from "@actions/core";

console.log("platform is", platform);

2. Create a new action that calls this script
3. Invoke the action in another repo
4. The console prints out "platform is undefined"

Expected behavior
platform should be defined and have arch info as well.

Desktop (please complete the following information):

• OS: Linux

[AnHeuermann]

I have the same issue in a TypeScript action.

The documentation has an example how to use it, but indeed it's not defined.