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https://github.com/tc39/proposal-type-annotations
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w .JDSP4PGU͕5$ʹఏग़ͨ͠Ҋ ݄ݱࡏ4UBHF
https://devblogs.microsoft.com/typescript/a-proposal-for-type-syntax-in-javascript/
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w τϥϯεύΠϧͤͣʹɺ UTϑΝΠϧΛ࣮ߦͰ͖ΔΑ͏ʹͳΔ
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w 5ZQF4DSJQUຊՈʹͱͬͯ
w 5ZQF4ZOUBY͕&$."4DSJQUʹؚ·ΕΔͱɺߏจͷՃʹඪ४Խϓϩη
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จ๏͕ඪ४Խ͞ΕΔҙຯ
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w ۙར༻͕ͨΓલʹͳΓͭͭ͋ΔɺCBCFM
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