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Summary: In javascriptcore(ios9), this code will run as expected(output 0 1): ```js for(let i=0; i<2; i++) { const data = i; console.log(data); } ``` But when debug in chrome, the above code will fail without `use strict` prologue (if you add prologue, rn will fail with red screen `Const declarations are not supported in strict mode`): https://code.google.com/p/v8/issues/detail?id=4432. So it's better to transpile contant by default. Closes https://github.com/facebook/react-native/pull/2955 Reviewed By: @svcscm Differential Revision: D2483398 Pulled By: @vjeux