[Help] Compatibility IE + Firefox old versions problems

[remy-poirier]

Is this a bug report?

Yes, I think so, or maybe I did something wrong but I'm stuck with Webpack config...

Can you also reproduce the problem with npm 4.x?

Yes

Environment

1. npm ls react-scripts-ts (if you haven’t ejected):
2. node -v: 8.11.3
3. npm -v: 6.3.0
4. yarn --version (if you use Yarn):
5. npm ls react-scripts-ts (if you haven’t ejected):

Then, specify:

1. Operating system: Windows 10
2. Browser and version (if relevant): Firefox 45 and IE11 (Working on Chrome)

Steps to Reproduce

(Write your steps here:)

1. npm install
2. npm start
3. Visit localhost:3333 on firefox 45 or IE11

Expected Behavior

It should display home page

Actual Behavior

Display a blank page, with a TypeError like this

Note: I cannot even click on the link because my computer freezes when trying to open the link, but I did it once, and the error seemed related with arrow functions, so maybe I need one more transpiler or something ?

Note

This is an ejected project

Comment

I think I a missing a simple thing but I tried so many things and until now nothing has worked.
Here is the interesting lines from package.json and webpack.config.dev:

package.json

Versions

"babel-loader": "^7.1.2",
"babel-preset-react-app": "^3.1.1",
"ts-loader": "^2.3.7",
"webpack": "3.8.1",
"webpack-dev-server": "2.9.4",
"typescript": "2.9.2"

Babel presets

"babel": {
    "presets": [
      "react-app"
    ]
  }

Here is a pastebin from webpack.config.dev : Click here

I really hope someone have time to help me, I am running out of ideas...

Also, the project is pretty big, so I don't feel so confident of migrating to create-react-app v2.