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I loved it to. I'd love to make a typed coffeescript variant, which transpiles to TypeScript rather than JavaScript. My pet name for this is `tycoscript`.

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I like the idea, but I'd recommend the name "ToffeeScript".

This already exists, see [1]. Development has a bit stalled, but afaik the author wants to keep pursuing it. There's even a Discord server for this kind of project, see also this GitHub thread [2] where CS+TS is being discussed in general. Alternatively, you can code in Coffee with JSDoc type annotations, yielding a near-TypeScript experience in both IDE and output, albeit the annotation syntax can be a bit annoying, ironically.

[1] https://github.com/edemaine/coffeescript/blob/typescript/tes... [2] https://github.com/jashkenas/coffeescript/issues/5307

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