
"This is a patch release: It is backward binary compatible with all earlier versions in the 1.x series: libraries compiled with 1.0.x through 1.20.1 can be used with 1.20.2 without change. It is forward binary compatible with 1.20.0 and 1.20.1: libraries compiled with 1.20.2 can be used with previous 1.20.x versions without change. It is backward source compatible with 1.20.0 and 1.20.1: source code that used to compile with previous 1.20.x versions should compile as is when upgrading to 1.20.2."
"In addition, like Scala.js 1.20.0 and 1.20.1: It is not forward binary compatible with 1.19.x: libraries compiled with 1.20.2 cannot be used with 1.19.x or earlier. It is not entirely backward source compatible with 1.19.x: it is not guaranteed that a codebase will compile as is when upgrading from 1.19.x or earlier (in particular in the presence of -Xfatal-warnings). As a reminder, libraries compiled with 0.6.x cannot be used with Scala.js 1.x; they must be republished with 1.x first."
Scala.js 1.20.2 delivers performance improvements to both WebAssembly and JavaScript backends. The Scala standard library has been upgraded to align with Scala 2.12.21 and 2.13.17. The patch is backward binary compatible with all earlier 1.x versions, forward binary compatible with 1.20.0 and 1.20.1, and backward source compatible with 1.20.0 and 1.20.1. It is not forward binary compatible with 1.19.x and not entirely backward source compatible with 1.19.x, which may affect compilation in the presence of -Xfatal-warnings. Micro-optimizations were applied to low-level methods in java.lang.Math, Float, and Double. Getting started resources include a tutorial, Discord #scala-js, Stack Overflow, and GitHub for bug reports.
Read at Scala.js
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