javascript - Get a list of Available Functions on Tampermonkey

I currently have a Tampermonkey script with a series of contextualized functions that I provide as options to run when on a certain page.

A simplified version of my code would be:

window.func1 = function func1() {...}
window.func2 = function func2(a) {...}

window.func3 = function func3(a, b) {...}

I would like to have some function that could take the current script I have and provide me with a list of the available functions, something along the lines of:

>> getAvailableFunctions()
<< func1, func2, func3

I have been investigating with the Object.getOwnPropertyNames method, but I can't seem to pull that one out with Tampermonkey.

Can I have some input?

Thank you!