JavaScript boy and “lovely thoughtleader” 
he/him 
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In TC39 we discussed reserving : after a declarator so implementations could not de-facto standardize incompatible type annotations. We knew this would oblige us to standardize type anno/expr syntax at some point. We didn't figure on Flow using ambiguous expression syntax! @awbjs
TypeScript usage of this syntax predates Flow, it’s not purely to blame here.
Sure. I blame C++.
We held out for years, but the inability to provide type arguments to calls was crippling. We debated unambiguous syntax, but familiarity—especially with TypeScript—trumped all. Definitely knew about .< syntax before choosing.
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