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A comment on Scala.js for large and complex front end apps [video]. Parent comment
Scala.js solved all the problems you mention.
* Performance is on par with hand-written JavaScript.
* The compiler and optimizer are incremental so they compile your code in 1-2 seconds for significant codebases.
* Interoperability is as easy as in TypeScript: just use type definitions for external JS libraries and then transparently call them.
It's all explained from the big boxes on the page of https://www.scala-js.org/
Don't let your past experiences give you wrong impression of Scala.js.
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Scala.js solved all the problems you mention.
* Performance is on par with hand-written JavaScript.
* The compiler and optimizer are incremental so they compile your code in 1-2 seconds for significant codebases.
* Interoperability is as easy as in TypeScript: just use type definitions for external JS libraries and then transparently call them.
It's all explained from the big boxes on the page of https://www.scala-js.org/
Don't let your past experiences give you wrong impression of Scala.js.