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Re:Facebook Launches Flow, Static Type Checker for JavaScript by bri3d on Tuesday November 18, 2014 @01:58PM (#8625605)
It looks like it's designed for the IDE use case - on cursory inspection of the code, it contains an autocomplete database and a client-server architecture designed for editor plugins (with useful interfaces like "type at character index").

I'm surprised that they don't seem to have launched with a public editor plugin and that the documentation doesn't seem to mention it.

Re:Facebook Launches Flow, Static Type Checker for JavaScript by avik on Wednesday November 19, 2014 @06:25PM (#8633382)
The source also has an emacs plugin, named flow-types.el
Re:Facebook Launches Flow, Static Type Checker for JavaScript by fredemmott on Tuesday November 18, 2014 @02:28PM (#8625781)