Porting 600KLOC of Closure Compiler JS to typescript: https://www.lucidchart.com/techblog/2017/11/16/converting-600k-lines-to-typescript-in-72-hours/
Although Closure offers a set of static analysis tools, typescript is often stricter! This finds bugs but complicates porting.
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I've just added closure support to my toy programming language: https://github.com/Wilfred/garden/commit/d1fb4566a2187dfe98fb1d2278a7a0d2acd8059e
Closures are more fiddly than I expected, but I now have a much better understanding of what downward/upward funargs are :)
(Downward: passing a closure, upward: returning a closure)
Today I learnt that gcc can mean 'Google Closure Compiler'. It's a sophisticated compiler, but I suppose its use cases are sufficiently non-overlapping with C compilers to avoid confusion. Surprised me though.
Porting babel and closure compiler to Rust!