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FileChange -> UpdatedAST
Map compiler pipeline steps (parsing, typechecking) as dynamic dependency rules in an incremental build engine to recompute only dirty nodes when a source file changes.
Problem it solves
Recompiling whole files or modules from scratch on every keystroke is too slow for real-time IDE feedback.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.