Support `wasm` target #372

Job	Run time
danger-check	27s
dump-unicode-data / generate-dump	5s
reviewdog	2m 58s
check-pr / check-style	3m 28s
check-pr / check-macos / check	12m 42s
check-pr / check-linux / check	10m 41s
check-pr / check-windows / check	11m 37s
	41m 58s

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