docs say the following:
> You will receive an error if you attempt to set an output value that was not declared in the action's metadata file.
but actions/typescript-action produces output https://github.com/actions/typescript-action/blob/releases/v1/src/main.ts#L13 which is not declared in action's metadata https://github.com/actions/typescript-action/blob/releases/v1/action.yml.
What is this - an outdated doc or a bug in the actions system?
It is also possible to provide an arbitrary output in "run" step with "echo". This looks like a very poweful option to prepare variables for next steps but will this still be working in future?
sample demonstrating both: