Chaining source generators

[ladeak]

As a creator of a source generator, I would like to have other generators "depend" on me. For example, my generator generates new file with a class A.cs, adds it as a source. Then I would like to invoke System.Text.Json's generator to generate serialization metadata for this newly generated A.cs file.

Invoking the other generator's Execute method from my generator does not seem to work. I assume because the files in the 1 generator are not yet compiled.

I don't see a clear path to re-compile the code and to get a new GeneratorExecutionContext, so that I can-invoke the second generator either.

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The only way I can see that could work is by co-operation of a user of the generators:

• adds a project, with generator1.
• adds a second project referencing the output of the first project with generator2.

So then the input of generator two includes the output of generator1.

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Are there any other suggestions?

[stefanloerwald]

There is an already open discussion about this in #48358

It's a very important feature for a wide spread of use cases.