Module ''popper.js'' has no exported member 'ReferenceObject'.

[Tuaniwan]

• This is a v1.x issue.
• I have searched the issues of this repository and believe that this is not a duplicate.

After updating from MUI v1.4.0 to v1.4.1, I get this error when building my project:

 [exec]
 [exec] ERROR in [at-loader] ./node_modules/@material-ui/core/Popper/Popper.d.ts:2:10
 [exec]     TS2305: Module ''popper.js'' has no exported member 'ReferenceObject'.
 [exec]
 [exec] ERROR in [at-loader] ./node_modules/react-popper/typings/react-popper.d.ts:29:23
 [exec]     TS2694: Namespace ''popper.js'' has no exported member 'Placement'.
 [exec]
 [exec] ERROR in [at-loader] ./node_modules/react-popper/typings/react-popper.d.ts:39:24
 [exec]     TS2694: Namespace ''popper.js'' has no exported member 'Modifiers'.
 [exec]
 [exec] ERROR in [at-loader] ./node_modules/react-popper/typings/react-popper.d.ts:40:24
 [exec]     TS2694: Namespace ''popper.js'' has no exported member 'Placement'.
 [exec]
 [exec] ERROR in [at-loader] ./node_modules/react-popper/typings/react-popper.d.ts:42:31
 [exec]     TS2694: Namespace ''popper.js'' has no exported member 'ReferenceObject'.

I checked and popper.js actually doesn't have those. Although, I'm not sure if they have to be explicitly available in popper.js.

Since I am not too familiar with this, I'm not sure if I made an obvious mistake or not. I tested going back to 1.4.0, and it works fine. I checked and there were a few changes to Popper.js in v1.4.1, but nothing that required changes on my part, so I wasn't sure if I had to change anything, but I didn't, except for the MUI version itself.

In case it's relevant and potentially the cause of my problem, my project has those two dependencies:
"popper.js": "1.12.9",
"react-popper": "1.0.0",

Environment

Tech	Version
Material-UI	v1.4.1
React	v16.3.0
browser	Chrome

[oliviertassinari]

@Tuaniwan What version of popper.js have you installed in your node_modules?

[oliviertassinari]

Oh ok. We need to increase the popper.js dependency, we can't use [email protected].
https://github.com/mui-org/material-ui/blob/4eb6628e5be27a6c140c774069ea794d091c48c3/packages/material-ui/package.json#L57

ReferenceObject export was added in [email protected] if I'm not mistaken.

[Tuaniwan]

@oliviertassinari If ReferenceObject export was added in [email protected], do you mean we can't use the specific version [email protected] only or anything after that too?

[oliviertassinari]

You can, but the package will be duplicated in your bundle.

[oliviertassinari]

@Tuaniwan Do you want to increase the minimal required version of popper.js on our package.json?

[Tuaniwan]

Sure, as soon as I am off of work, [email protected] as minimal required version sounds good?