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In addition to the "more approachable to contributors" answer, Flow and TypeScript are easy to port between, since they're both light extensions to JS and have
by alangpierce 8y ago
In addition to the "more approachable to contributors" answer, Flow and TypeScript are easy to port between, since they're both light extensions to JS and have almost the same syntax. I've done a Flow to TS port a few times and almost all of the code stays the same, it's just accounting for little differences in the type system details. Switching to a completely different programming language is much more work and much riskier.