libjs-q 1.5.1-2 (amd64 binary) in ubuntu focal

 Q is a tool for creating and composing asynchronous promises in JavaScript.
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 If a function cannot return a value or throw an exception without blocking,
 it can return a promise instead. A promise is an object that represents the
 return value or the thrown exception that the function may eventually provide.
 A promise can also be used as a proxy for a remote object to overcome latency.
 .
 This package contains the q.js JavaScript library.