Download Latest Version GopherJS 1.21.0 for Go 1.21.13 source code.zip (523.2 kB)
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GopherJS 1.21.0 for Go 1.21.13 source code.tar.gz 2026-06-26 378.8 kB
GopherJS 1.21.0 for Go 1.21.13 source code.zip 2026-06-26 523.2 kB
README.md 2026-06-26 4.1 kB
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Hi Gophers!

I am pleased to announce a new supported version. This release brings GopherJS's upstream Go support up to go1.21.13!

This release also includes an update to our index pointers (&s[i]) that allows the new unsafe.Slice method and casting back into a slice. There are improvements to method shadowing and ambiguity resolution, and nil-awareness checks. We have improved the speed of stack trace caller generation when being used in code like t.Helpers(). And we have removed support for the deprecated node_syscall.

What's Changed

Full Changelog: https://github.com/gopherjs/gopherjs/compare/v1.20.2...v1.21.0

Source: README.md, updated 2026-06-26