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I just realized my idea of downleveling #TypeScript as a browser dev-only feature does have a discussion ongoing in the TC39 proposal (though I don't think most of the comments follow my interpretation). github.com/tc39/proposal-type-annotations/issues/50 @develwoutacause/1513416629752762370
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I wonder if one could make a browser extension which watches the network layer and takes anything with
Content-Type: application/typescript
and downlevels it. Could we build that today and get all the build-time benefits of the TC39 proposal with none of the effort?