Support `wasm` target #380

Job	Run time
danger-check	26s
dump-unicode-data / generate-dump	8s
reviewdog	2m 38s
check-pr / check-style	2m 41s
check-pr / check-linux / check	2m 37s
check-pr / check-macos / check	2m 40s
check-pr / check-windows / check	2m 56s
	14m 6s

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