- Plugins for applications (for example, Zellij)
- Filters for proxies (for example, Envoy)
- User-defined functions for databases (for example, ScyllaDB)
- Functions for FaaS (for example, Fermyon Platform)
This is made possible by the WASI (WebAssembly System Interface) specification, which allows WASM code to be executed in various contexts. The execution of WASM modules by a Go application, with WASI runtimes SDKs, was until recently "acrobatic".
This gap is now filled by the Extism project, which allows writing WASM plugins in various languages for your Go (but not only) applications.