èªåç¨ã®ã¡ã¢ Closure Compilerã ES6 ã®ãã£ããã¢ãããéå§ãã¦ããã以ä¸ã®ã³ãã³ãã©ã¤ã³ãªãã·ã§ã³ã追å ããã¦ãã¾ããã --language_in VAL Sets what language spec that input sources conform. Options: ECMASCRIPT3 (default), ECMASCRIPT5, ECMASCRIPT5_STRICT, ECMASCRIPT6 (experimental), ECMASCRIPT6_STRICT (experimental) --language_out VAL Sets what language spec the output should conform to. If omitted, defaults to the value of language_in. Options:

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