Inefficient recompilation

[felixfbecker]

Right now, ProjectConfiguration.reset() unsets everything including the Program and TypeScriptService. Then the next call to init() will initialize everything from scratch. This is called by refreshFileTree(), which is called for example after dependency installation.

Afaik, this is not the intended usage. When creating a Program, you are supposed to pass in an old Program, and SourceFiles etc that can be reused and didn't change can be reused. I don't think the LanguageService should be destroyed.

[alexsaveliev]

When creating a Program, you are supposed to pass in an old Program, and SourceFiles etc that can be reused and didn't change can be reused.

Yeah, but the devil is in the detail. One cannot simply pass ts.createCompilerHost(...) to ts.createProgram(..), you should construct proper instance of CompilerHost object which is a large part of LanguageService::getProgram()

Anyway, I agree that we need to act at some point