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Re:Scala.js 1.0.0-RC1 by sjrd on Tuesday November 26, 2019 @06:18AM (#21637305)
It's exactly like TypeScript. You write type definitions or you find them online, like in TypeScript, then you can call any JavaScript API using the relevant types.

Full relevant docs at https://www.scala-js.org/doc/interoperability/

Re:Scala.js 1.0.0-RC1 by manx on Tuesday November 26, 2019 @08:03AM (#21637875)
Many TypeScript type definitions are also automatically converted to ScalaJS: https://github.com/oyvindberg/ScalablyTyped