Canonical way to share generators

Say I develop a package which provides a type Angle. As part of my test suite for my package I have created generators for this type like

extension AnyAngle on Any {
  /// Generates a [Angle] in a certain range.
  Generator<Angle> angleInRange(double min, double max) {
    assert(min >= -180);
    assert(min < max);
    assert(max <= 180);
    return any.doubleInRange(min, max).map(Angle.makeFrom180);
  }

  /// Generates a [Angle] in the full possible range.
  Generator<Angle> get angle => angleInRange(-180, 180);
}

What is the intended way for me to share these generators with consumers of my package, so that they may use them in their unit tests?

I understand that this is more of a general dart question, but I was curious what you people here think about this question. For glados, providing generators along with types could be seen as part of the package interface.

Edit: This is more of a discussion than an issue. If the repo opens a discussion tab, then we can move the issue there.

Start by reviewing the shown AnyAngle extension and the existing Any/Generator API. Decide whether generators such as angleInRange should be exposed as part of a package interface and record the canonical sharing approach; no file or test is named in the issue.