The playground is a place where users can explore GopherJS without needing to install anything, or to share code with others.

To update the entire playground environment, just run go generate github.com/gopherjs/gopherjs.github.io/playground. It will install your local version of GopherJS compiler, build the playground, make a temporary copy of Go to /tmp/gopherjsplayground_goroot, rebuild and copy the standard library into the pkg directory.

Working on the playground application itself is made easier by using the gopherjs serve command to rebuild and serve the playground every time you refresh the browser.

gopherjs serve

Then open http://localhost:8080/github.com/gopherjs/gopherjs.github.io/playground.

VERSION="$(go list -m -versions -f "{{ range .Versions }}{{ println . }}{{ end }}" github.com/gopherjs/gopherjs | tail -n 1)"
echo "$VERSION"
go get -v "github.com/gopherjs/gopherjs@$VERSION"
go mod tidy