We do have "tdz" option in Babel (not really documented) that compiles some cases into a throw: https://github.com/babel/babel/blob/7.0/packages/babel-plugin-transform-es2015-block-scoping/src/tdz.js … @benjamn @wycatspic.twitter.com/9wB9H7s0U9
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I'd be very interested in helping with nuances for an as-strict-as-possible mode.