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Don't see how that follows. Typescript treats code as either TS or JS depending on the file extension. But that doesn't mean nobody who has JavaScript code would switch to Typescript. The idea is, you migrate one file at a time. With Circle it's even more gradual, since you can migrate one file one feature at a time.

I think the idea is that you can migrate a translation unit at a time anda feature ata time while still being able to link your whole application. Not differently from the migration path between c++ revisions.

As someone with a lot of live audio background, I lament bad audio at conferences. I keep thinking that there is a product need there, but it feels too much like selling vitamins.