IE 11 support / babel

[dptoot]

Node.js Version:

10

Operating System:

Windows

Steps to Produce Error:

Use opossum in IE 11.

It looks as though the opossum library isn't running through babel transpilation. This is causing our IE11 bundles to fail due to many non-supported ES6 features like template-literals and class syntax.

I would think the simple addition of adding a babel transpile, utilizing the babel-preset-env, to the build would suffice for enough support.

Thoughts?

[dptoot]

I am able to workaround this today by adding a custom webpack rule to include opossum using our babel-loader. But I would say that this is usually up to the package to handle es5 support.

[tavogel]

This fails for us when using UglifyJS as well. You can see template literals being used in the minified code:
https://cdn.jsdelivr.net/npm/[email protected]/dist/opossum.min.js

new Error(`Timed out after ${this.options.timeout}ms`)

[tavogel]

I have opened a PR that works with babel-loader and core-js@3. Even if you don't want to use the core-js polyfills, you can use babel-loader and preset-env without useBuiltIns to at strip the template literals, and other syntactic sugar.

[lance]

Fixed in #380