JavaScript boy and “lovely thoughtleader” 
he/him 
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Nice! What happens if a module only use the types from another module that has side effects? Is this detected and taken into account? When @mjesun and me were exploring to do tree shaking in metro these kind of things were really challenging to do in a performant way
The implementation was driven by TypeScript which doesn't have 'import type'. It resulted in a bunch of unfixable module cycles inside Rome (I'm converting it from Flow). Whether a module is marked as "only for types" isn't effected by anything about the file itself.
Makes sense, relying on the side effects of a module that was imported just for its types is quite an edge case 
i was just curious if Rome did some kind of pre-analysis of dependencies before building the graph
There's a step called analyzeDependencies which is just a method in the Rome compiler that does some single-file static analysis. It's super cachable and includes stuff like if it uses top level await, where are imports used for the first time (cycle detection) etc
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