Is there an easy way to obtain an Element/DartType for a symbol that is not imported by the current library?

[dark...@gmail.com]

Hello!

I'm looking for the equivalent of TypeProvider, but for third-party objects.

For example, while writing lints for one of my packages, I want to use the various DartType APIs (such as InterfaceType.instantiate or those from TypeSystem).

The thing is, even though a library may be using my package, it may not have its content imported.

This can happen when user code is split into multiple libraries. For example, a widget could be using flutter/material.dart. Then 'main' uses this widget, without importing flutter/material.dart

I could theorically resursively look through all imports/exports. But that feels very inneficient. 

So to reiterate: Is it possible to obtain a DartType for an arbitrary object?

Ideally we'd have some form of get(uri, name) 

Thanks!

[Brian Wilkerson]

I'm not aware of any guaranteed performant way to do so, but if you have an `AnalysisSession`, you can use `uriConverter` to convert the known URI to a file path, and then you can use `getResolvedLibrary` to get a `LibraryElement`. From there you ought to be able to find the element you're looking for (and compute the `thisType`).

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[Konstantin Shcheglov]

  We have `Future<SomeLibraryElementResult> getLibraryByUri(String uri)` in `AnalysisSession`.

  We don't have in `AnalysisSession` API to get `LibraryElement` synchronously.

  So, you cannot do: I know that a `LibraryElement` that I have now can only be loaded if it also imports the library that I want.

  Theoretically we could add `SomeLibraryElementResult? getLibraryIfAlreadyLoaded(Uri uri)`.

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Konstantin Scheglov

Software Engineer

Google, Inc.