This is a work in progress. Version 1.4 included minimal support for WASM (we are currently at version 1.5): https://crystal-lang.org/2022/04/06/1.4.0-released.

This is a work in progress. Version 1.4 included minimal support for WASM (we are currently at version 1.5): https://crystal-lang.org/2022/04/06/1.4.0-released.html https://crystal-lang.org/2022/04/06/1.4.0-released.html. I expect full WASM support in the near future.