Removing TSPropertySignature node adds commas to the type declaration

[danielo515]

I originally opened this issue on the jscodeshift project (facebook/jscodeshift#464), but I'm pretty sure it is originating on this library.
Basically when you try to remove a type property of a type definition you get unneeded commas like it was an object.
This only happens for typescript, if you use flow you have to use ObjectTypeProperty that works correctly.

Input:

type Props = {
    __: translator;
    form: Form<any>;
    isOpen: boolean;
    closeModal: () => void;
};

Execute:

  j(file.source).find(j.TSPropertySignature, { key: { name: "__" } }).remove();

Output:

type Props = {
    form: Form<any>;,
    isOpen: boolean;,
    closeModal: () => void;
};