Wrong typings for echo function

[jcubic]

Issue summary

It seems that the typings for echo are wrong.

Expected behavior

It should accept function that only returns string, string[] or Promise

Actual behavior

it accepts to return type of promise of everything.

Here are the typings:

declare namespace JQueryTerminal {
    type echoValue = string | string[] | Element | JQuery<Element> | (() => string | string[]);
    type setEchoValueFunction = (value: TypeOrPromise<echoValue>) => void;
    type greetingsArg = ((this: JQueryTerminal, setGreeting: setEchoValueFunction) => (void | TypeOrPromise<JQueryTerminal.echoValue>)) | string | null;
}
interface JQueryTerminal<TElement = HTMLElement> extends JQuery<TElement> {
    echo<TValue = JQueryTerminal.echoValue>(arg: TypeOrPromise<TValue>, options?: JQueryTerminal.EchoOptions): JQueryTerminal;
}

You can't return the promise of jQuery Element, but this is how works according to types.

[jcubic]

it should be:

type echoValue = TypeOrPromise<string | string[] | Element | JQuery<Element>>| (() => TypeOrPromise<string | string[]>);

[jcubic]

Also maybe it should be any because of renderHandler, but maybe that will be solved by a generic echo.