Fix typings for mergeAll and concatAll

[lukaselmer]

// this is how the typings work
const numbers: number[] = Observable.of([1, 2, 3]).mergeAll();
// this would be correct (I think)
const numbers: Observable<number> = Observable.of([1, 2, 3]).mergeAll();

I believe that it is fixed in the next major release #2690

[rxjs-bot]

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[coveralls]

Coverage remained the same at 97.734% when pulling 2dafd0a on lukaselmer:fix-typings into 491970f on ReactiveX:master.

[benlesh]

cc @david-driscoll

[benlesh]

I'm unable to verify that there is an issue here, at least in master with pipeable mergeAll. Sorry, @lukaselmer, I'm going to close this for now.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.