How to get the LibraryElement of an arbitrary Dart code

[Nico Rodsevich]

When using 

parseCompilationUnit("...");

I can get an AST tree of arbitrary dart code.
I want to achieve the same with the LibraryElement, through the dart source provided as a String; but in the docs https://github.com/dart-lang/sdk/blob/master/pkg/analyzer/doc/tutorial/analysis.md (Thanks a lot for the one that uploaded them) I can't see any clue apart from writing the string contents to a tmp file on disk (almost a sin).
How can I get what I'm looking for?

[Brian Wilkerson]

In order to get a `LibraryElement`, you need to get a resolved AST. There isn't an equivalent to `parseCompilationUnit` that will get you a fully resolved AST. The reason for that is because resolution requires a lot more information, most of which is normally computed by looking at the surrounding directory structure.

You basically need to create an `AnalysisContextCollection` as described in https://github.com/dart-lang/sdk/blob/master/pkg/analyzer/doc/tutorial/analysis.md. That API reads from the file system, but all access to the file system goes through the `ResourceProvider` (an optional parameter that isn't yet described in the docs). There is an implementation of `ResourceProvider` named `MemoryResourceProvider` that allows you to simulate a file system from strings stored in memory, which will negate the need to wrote a temporary file to disk.

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[hacker1024]

https://stackoverflow.com/a/72747246/13458266