Work with babel may throw prop "MutationObserver" undefined.

[HairyRabbit]

This mistake maybe happen on
https://github.com/mozilla/nunjucks/blob/master/browser/nunjucks-slim.js#L1340
can't work with 'use strict'.

I add ignore field on babelrc would fix this:

{
  ignore: ['node_modules/nunjucks/*']
}

Are there better ways to solve problems？

Anything help.

Thanks. :)

[at0g]

The issue you're having is upstream from this lib - I can't really do anything about it here.

With babel, it makes sense to exclude node_modules that don't require transpiling as you'll get faster build time as a result.

[HairyRabbit]

@at0g
:) thanks