Error message with Angular Ivy

[LaurentPlagne]

Hello,
I am a newby user of both angular and Plotly hence forgive me if my question is not relevant.

I try to follow the instruction to use Plotly in an angular component and I get the followiing error message :
`ERROR in node_modules/angular-plotly.js/src/app/plotly/plotly.module.d.ts:1:22 - error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class.

This likely means that the library (angular-plotly.js) which declares PlotlyModule has not been processed correctly by ngcc, or is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.

Any hint ?`

[LaurentPlagne]

Forgot to add the angular version
Angular CLI: 9.1.3
Node: 12.16.3
OS: linux x64

Angular: 9.1.3
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package Version

@angular-devkit/architect 0.901.3
@angular-devkit/build-angular 0.901.3
@angular-devkit/build-optimizer 0.901.3
@angular-devkit/build-webpack 0.901.3
@angular-devkit/core 9.1.3
@angular-devkit/schematics 9.1.3
@ngtools/webpack 9.1.3
@schematics/angular 9.1.3
@schematics/update 0.901.3
rxjs 6.5.5
typescript 3.8.3
webpack 4.42.0

[andrefarzat]

Hello @LaurentPlagne . I could not replicate it locally. Looks like is something new related to Ivy ( haven't tested anything about it yet ).
Let me ask you, did you followed the quick start on the README.md and used the regular PlotlyModule ?

[LaurentPlagne]

Hello Andre,
thank you for your answer. I have restarted from scratch and followed the README steps an I ran into this (#75) bug. The change of target from es2015 to es5 solved it.
Thank you again

[timothyjhanson]

In package.json scripts object adding this key value pair fixed the issue for me.

"postinstall": "ngcc"