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@getify At a minimum files are prepended with "use strict" since module code is assumed.

@sebmck but a single true/false flag could be tracked during parsing, in theory right?

@getify Well Babel can still, and does, transform non-ES2015+ nodes.

@sebmck whatever transforms babel does, i want a build tool to be able to know easily/efficiently if any transforms happened or not.

@sebmck the fact that things like "use strict" are inserted, and perhaps whitespace or comments tweaked, makes comparison hard.

@getify @sebmck I'm curious what sorts non-ES6 to non-ES6 transformations are done?

@adamrackis There's a bunch of other transformers http://babeljs.io/docs/usage/transformers/ … Also you can't tell what plugins are going to do. @getify

@sebmck @getify Thx! What's the point of es5 properties mutators? The "in" code seems clearer and simpler.