he/him 
Smaller bundles. Decreased risk for module cycles. Better dependency graph and bundle analysis.
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Rome detects imports that are only used in TS or Flow types and marks them when analyzing dependencies. These imports will not effect module order or be included in a bundle. Files that contain only types will never need to be included.
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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.
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What happens if you import a class and use it a type ?
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Do you have a code example?
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Literally just ran into this problem at work yesterday. I'm planning on forking transform-strip-flow-types to get around it. Has anyone else already done this?
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