[Question] How to modify a property of a type alias?

I would like to go through all types and interfaces and replace the property member if it exists. So I would like to change

interface X {
    member: OldMember;
    otherStuff: ...
}
type Y = {
    member: OldMember;
    otherStuff: ...
}

to

interface X {
    member: NewMember;
    otherStuff: ...
}
type Y = {
    member: NewMember;
    otherStuff: ...
}

For interfaces, I found I can do i.getProperty('member').set({ type: "NewMember" }), but I was struggling to find the equivalent functions for types. What am I missing?

[dsherret]

No problem! Not much else to do right now haha 😄

[binoche9]

Ah that did the trick. Thank you for walking me through it! Plus the amazing response time!