Support `wasm` target #378

Job	Run time
danger-check	33s
dump-unicode-data / generate-dump	6s
reviewdog	2m 44s
check-pr / check-style	3m 46s
check-pr / check-linux / check	7m 40s
check-pr / check-macos / check	13m 19s
check-pr / check-windows / check	8m 58s
	37m 6s

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