Motivation

The new action API is changing in order to be more in line with the new Promise() constructor, so we want to communicate that change.

The new api is:

action((resolve, reject) => {
  let timeout = setTimeout(() => {}, 1000);
  return () => { clearTimeout(timeout) };
})

As you can see, it is just like new Promise() except the return value is the "uninstall" function. This brings us closer to the Rosetta Stone promise that action() is just like promise constructor.

Approach

This adds the new action API to the old action API in a backwards compatible manner via an overload, and then deprecates the old API.