Bug#954993: core-js and webpack is not working well together (breaks gitlab ui)

[Pirate Praveen]

Package: webpack,gitlab,node-core-js
severity: important
With node-core-js from system, web console while visiting the gitlab 
instance (gitlab 12.8.6 in experimental)

the following error is shown and some ui elements don't work as 
expected (text are when trying to edit a file, clone button drop down 
etc)

TypeError: isObject is not a function
main.chunk.js line 11432 > eval:7:22
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/document-create-element.js:7
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11432
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/ie8-dom-define.js:5
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11654
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/object-define-property.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11965
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/create-non-enumerable-property.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11364
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/set-global.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12257
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/shared-store.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12302
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/shared.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12313
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/well-known-symbol.js:9
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12591
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/to-string-tag-support.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12502
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.object.to-string.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13012
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.function.name.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12789
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.regexp.to-string.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13092
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.regexp.constructor.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13069
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.string.split.js:5
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13223
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/indexed-object.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11676
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/to-indexed-object.js:2
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12425
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.array.iterator.js:3
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12730
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/webpack/buildin/global.js:7
   js http://gitlab.lxc/assets/webpack/main.chunk.js:14273
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/global.js:27
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11599
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/path.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12110
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/define-well-known-symbol.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11410
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.symbol.iterator.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13270
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/is-object.js:5
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11775
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.array.slice.js:7
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12766
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.symbol.description.js:9
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13259
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.symbol.js:5
   js http://gitlab.lxc/assets/webpack/main.chunk.js:13282
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/internals/export.js:1
   js http://gitlab.lxc/assets/webpack/main.chunk.js:11465
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> 
webpack-internal:///../../../../nodejs/core-js/modules/es.array.concat.js:5
   js http://gitlab.lxc/assets/webpack/main.chunk.js:12637
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   <anonymous> webpack-internal:///./main.js:2
   <anonymous> webpack-internal:///./main.js:342
   js http://gitlab.lxc/assets/webpack/main.chunk.js:15689
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   166 
http://gitlab.lxc/assets/webpack/pages.projects.show.chunk.js:369
   __webpack_require__ 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:84
   checkDeferredModules 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:46
   webpackJsonpCallback 
http://gitlab.lxc/assets/webpack/runtime.bundle.js:33
   <anonymous> 
http://gitlab.lxc/assets/webpack/pages.projects.show.chunk.js:1

​When using core-js from npmjs.com, the following error is shown

TypeError: Symbol is undefined
main.chunk.js line 2336 > eval:10:3
   exports well-known-symbol.js:10
   <anonymous> set-to-string-tag.js:5
   js main.chunk.js:2080
   __webpack_require__ runtime.bundle.js:84
   <anonymous> es.symbol.js:33
   js main.chunk.js:2938
   __webpack_require__ runtime.bundle.js:84
   <anonymous> global.js:1
   js main.chunk.js:14026
   __webpack_require__ runtime.bundle.js:84
   <anonymous> global.js:16
   js main.chunk.js:1433
   __webpack_require__ runtime.bundle.js:84
   <anonymous> export.js:1
   js main.chunk.js:1288
   __webpack_require__ runtime.bundle.js:84
   <anonymous> es.array.concat.js:2
   js main.chunk.js:2382
   __webpack_require__ runtime.bundle.js:84
   <anonymous> main.js:2
   <anonymous> main.js:342
   js main.chunk.js:15442
   __webpack_require__ runtime.bundle.js:84
   166 pages.projects.show.chunk.js:369
   __webpack_require__ runtime.bundle.js:84
   checkDeferredModules runtime.bundle.js:46
   webpackJsonpCallback runtime.bundle.js:33
   <anonymous> pages.projects.show.chunk.js:1

​