TS syntax for string types for OneOf

[a8775]

TypeScript 1.8 is introducing a new syntax for string types:

https://github.com/Microsoft/TypeScript/wiki/What%27s-new-in-TypeScript#string-literal-types

eg.:

interface AnimationOptions {
    deltaX: number;
    deltaY: number;
    easing: "ease-in" | "ease-out" | "ease-in-out";
}

This could provide or extend the OneOf annotation.
Possibly some tools could infer more from this syntax as well.

Current syntax is as follow (https://github.com/angular/material2/blob/master/src/components/sidenav/sidenav.ts):

@Input() @OneOf(['over', 'push', 'side']) mode: string = 'over';

I think of something like:

@Input() @OneOf() mode: 'over'|'push'|'side' = 'over';

or even NG M2 could infer from the type the OneOf annotation is expected:

@Input() mode: 'over'|'push'|'side' = 'over';

[zoechi]

I assuem this needs an equivalent in JS and Dart.

[jelbourn]

Yeah, unfortunately there's no Dart equivalent to this syntax.

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