IE11, error in toposort/node_modules/index.js

Using react: 16.4.1, typescript: 2.9.2, yup: 0.25.1. Build of app cannot be rendered in IE11. It is caused by throw new Error( 'Unknown node. There is an unknown node in the supplied edges.', ); on line 29 and throw new Error( 'Found unknown node. Make sure to provided all involved nodes. Unknown node: ' + JSON.stringify(node), ); on line 53 in funciton toposort and visit in index.js. Problem is comma in the error object. When the prettier is disabled and comma not added to object everything works fine.

[helariL]

I don’t understand why this issue was closed. Adding polyfills is not always possible. Would it be possible to look into ways of fixing this? IE11 is officially supported for 5 more years.

[ThomasLarge]

I also have this issue,

TypeError: Object doesn’t support property or method ‘from’

see attached screenshot

I’m using Yup with Formik but when I am using the validationSchema it’s creating this issue

const validationSchema = Yup.object().shape({
   title: Yup.string().required('Required'),
   description: Yup.string().required('Required'),
   meta: Yup.string().required('Required'),
   push: this.state.push
	? Yup.string().required('You must add text to send out')
	 Yup.string()
});

If you need anything else to help you please let me know!

@jquense are we able to open this issue again?