Thank you for this report.
I did not think of checking compatibility with IE 11 with the last releases.
You just made me think of a use case fro it:

• What if we want to use vsg to run compatibility tests of components.

I will look into it.

Hi @pshendry,

The solution I found is a little bit more hands on that I would have liked. The issue you are facing with IE 11 is that babel does not compile any of the files in node_modules. And some modules chose to remain es6 compatible only. buble, used by react-styleguidist is one of those modules.

In order to fix your build you will have to track down those modules used by vsg and include them to your babel-loader config. You will find houw to do it in this issue

Tell me if it works.

Thanks for the help. I think I may have gotten closer, but still no luck getting it to run in IE.

In a Vue CLI project, the transpiling can be done using the transpileDependencies option like this:

vue.config.js:

module.exports = {
    transpileDependencies: [
        "buble",
        "regexpu-core",
        "unicode-match-property-ecmascript",
        "unicode-match-property-value-ecmascript",
    ],

I built up that list of packages one by one by following the error trail, but at this point I get an error like this:

./node_modules/buble/dist/buble-browser.es.js 10172:51-65
"export 'default' (imported as 'rewritePattern') was not found in 'regexpu-core'

Basically that buble-browser.es.js isn't getting transpiled for some reason, so it's failing to import the transpiled regexpu-core library. It should be getting transpiled though, because the way transpileDependencies works in Vue CLI, it will include the file if its path matches the string at all (which is arguably a misfeature, see vuejs/vue-cli#3057). So buble/dist/... should get transpiled as well.

I'm stumped as to how to get any further. If IE 11 isn't supported by this library feel free to close the issue I guess.

Hello @pshendry, Evan works on a mac. Therefore all his slashes are normal. yours are backslashes.

I fought all day with webpack today about it. There is an issue in their regular expression that assumes your OS to be a Mac therefore all buble/dist/whatever are never compiled... that is unfortunate indeed.
You can go ahead and creat a PR to vue-cli if you want this fixed fast. I will probably get on it one day.

Bart