A mixed / pseudo value is one of the three types listed below, to be resolved into:

• an actual value, if successful
• an error, if the resolution fails

1. Actual Value

Anything other than a function or a promise. The value is resolved with immediately.

2. Function

Expected to return the actual value. If it returns again a function or a promise, the resolution attempt will continue.

If the function throws an error, the value is rejected with that error.

Functions on all levels receive the same this context and the list of parameters as provided by the original caller.

If the function is an ES6 generator, it is converted into a promise and then processed accordingly.

3. Promise

To resolve with the data that represents the actual value. If it resolves again with a promise or a function, the resolution attempt will continue.

A rejected promise becomes a rejected value, with the same reason specified.