wasm-opt

TLDR

Apply default optimizations and write to a given file

$ wasm-opt -O [input.wasm] -o [output.wasm]

Apply all optimizations and write to a given file (takes more time, but generates optimal code)

$ wasm-opt -O4 [input.wasm] -o [output.wasm]

Optimize a file for size

$ wasm-opt -Oz [input.wasm] -o [output.wasm]

Print the textual representation of the binary to console

$ wasm-opt [input.wasm] --print