Gregory's Server@philipwalton Yes, but Opera Mini at least partially supports ES5: https://caniuse.com/?compare=op_mini+all&compareCats=all so transpiling to ES5 still has some small benefit.
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@niutech also, as an FYI in case you were curious, Babel's preset-env plugin does not support Opera Mini, see: https://babeljs.io/docs/babel-preset-env#caveats |
@niutech if a site needs to support Opera Mini, then I agree it makes sense to transpile to ES5 for those users.
But the point I make in my article is that you shouldn't transpile to ES5 and then just *assume* your site fully works in Opera Mini—because my guess is it probably doesn't.
Opera Mini is a very particular browser, and supporting it requires manual testing.