wasm-opt Command Examples

Optimize WebAssembly binary files. More information: https://github.com/webassembly/binaryen.

• Apply default optimizations and write to a given file:

wasm-opt -O {{input.wasm}} {{[-o|--output]}} {{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]}} {{output.wasm}}

• Optimize a file for size:

wasm-opt -Oz {{input.wasm}} {{[-o|--output]}} {{output.wasm}}

• Print the textual representation of the binary to console:

wasm-opt {{input.wasm}} --print