We are using the LibraryDependencyMirror API to reflect on exported symbols, ensuring that we do not pollute the global namespace.

It works; thank you! Some feedback:

See our use case here: https://github.com/angular/angular.dart/blob/18c11147ad74034c65e959c0d19183ee4c8fd6f0/test/angular_spec.dart

* Suggestion 1: *

Implement a "LibraryViewMirror" which returns a LibraryMirror containing all the symbols visible as the library was imported. e.g.

import "package:angular/angular.dart";
currentMirrorSystem().findLibraryView(new Symbol("angular")).declarations;

e.g.

import "package:angular/angular.dart" show Parser;
currentMirrorSystem().findLibraryView(new Symbol("angular")).declarations;

Here, the declarations list would be [Parser];

Instead, I wrote a function that recurses over the library export tree and calculates a list of symbols exported from the library.

The combinators mirror proved somewhat difficult to work with. I used them to filter the list of symbols exported from a library.

* Suggestion 2: *

I would have preferred a explicit lists:

List<Symbol> get LibraryDependencyMirror.shownSymbols
List<Symbol> get LibraryDependencyMirror.hiddenSymbols

Instead I built that list by iterating over the combinators list. In my case CombinatorMirror.identifiers was always a list of a single element, which was confusing.

* Suggestion 3: *

Rename CombinatorMirror.identifiers to CombinatorMirror.identifier, making it a non-list.

Then I could implement a shownSymbols list using List methods (map, where):
shownSymbols = libDeps.combinators.where((c) => c.isShow).map((c) => c.identifier);

OR

Have LibraryDependencyMirror.combinators be a list of 0 or 1 elements, and have CombinatorMirror.identifiers contain all the hidden or shown symbols.

Them I could implement a shownSymbols list trivially:
shownSymbols = libDeps.combinators.isEmpty || !libDeps.combinators[0].isShow ? [] : libDeps.combinators[0].identifiers;