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Using a returned Promise as a value inside another Promise

Martinez

I have the below Promise:

function checkDetail() {
  return foo.onReady().then(() => foo.myThing("bar").isActive())
}

I need to use the result from this Promise as an argument to pass in an anonymous function, and that function is itself inside a Promise.

function attemptActivate() {
    promise.then(
        function() {
            function activateSuccessfully(checkDetail() ? "foo" : null) {
                //....
            };
            return callback({ success: true, error: "" });
        },
        function(error) {
            function activateUnsuccessfully(checkDetail() ? "bar" : null) {
                //....
            };
            callback({ success: false, error: "error" });
        }
    )
}

I understand I could normally chain promises together using successive instances of .then(), but in the case above they are two different promises so I don't believe that I chain them directly?

Currently the argument passed to my function is always the positive ("foo" or "bar") because the ternary validates the Promise checkDetail() as true.

How can I chain the promises so that the result of checkDetail() is awaited on before the rest of the other Promise continues, and how can I get it to return the value and pass that inside the Promise?