basic

Basic example

This example shows how to extend a Go application with an addition function defined in WebAssembly.

$ go run add.go 7 9
7 + 9 = 16

Compilation

wazero is a WebAssembly runtime, embedded in your host application. To run WebAssembly functions, you need access to a WebAssembly Binary (Wasm), typically a %.wasm file.

add.wasm was compiled from add.go with TinyGo, as it is the most common way to compile Go source to Wasm. Here's the minimal command to build a %.wasm binary.

cd testdata; tinygo build -o add.wasm -target=wasi add.go

Notes

• Many other languages compile to (target) Wasm including AssemblyScript, C, C++, Rust, and Zig!
• The embedding application is often called the "host" in WebAssembly.
• The Wasm binary is often called the "guest" in WebAssembly. Sometimes they need imports to implement features such as console output. TinyGo's wasi target, requires WASI imports.