tinygo/targets/wasm.json

{
	"llvm-target":   "wasm32-unknown-unknown-wasm",
	"build-tags":    ["js", "wasm"],
	"linker":        "ld.lld-7",
	"pre-link-args": [
		"-flavor", "wasm",
		"-allow-undefined-file", "targets/wasm.syms"
	],
	"emulator":      ["cwa"]
}