Support `wasm` target #382

Job	Run time
danger-check	33s
dump-unicode-data / generate-dump	5s
reviewdog	2m 52s
check-pr / check-style	3m 24s
check-pr / check-macos / check	11m 47s
check-pr / check-linux / check	7m 2s
check-pr / check-windows / check	9m 48s
	35m 31s

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