There has been some progress recently. A big part of stdlib specs already pass on WASM. It's usable for experimentation. A great introduction is available at ht

There has been some progress recently. A big part of stdlib specs already pass on WASM. It's usable for experimentation. A great introduction is available at https://glue.im/noah/introduction-to-webassembly-in-crystal https://glue.im/noah/introduction-to-webassembly-in-crystal and https://glue.im/noah/webassembly-host-functions-in-crystal https://glue.im/noah/webassembly-host-functions-in-crystal