Vaadin Maven Plugin - Babel Issue

Flow
1

Hi all,

A rather urgent concern for me and my team : We cannot build our Vaadin flow project anymore :frowning:

Our Vaadin version is 14.1.2, and usually, our build is done with the help of the vaadin-maven-plugin.

Specifically, the goal ā€œBuild-frontendā€ calls ā€œnpm installā€, which does a bunch of Node.js related stuff (sorry for vagueness, but the whole node.js relationship with Vaadin is a bit over my head).

This has always worked in the past, but apparently, there has been some ā€œBabelā€ release, and an issue with it (https://github.com/zeit/next.js/discussions/11233 ) .

Which leads to the project not building anymore, because of a lot of errors of this kind

ERROR in ../nodemodules/@vaadin/vaadin-grid/src/vaadin-grid.js?babel-target=es5
Module build failed (from ../nodemodules/babel-loader/lib/index.js):*
grid.js: Unknown helper createSuper

Iā€™m investigating about it, but any help would be greatly welcome :slight_smile:

2

I have not experienced that particular error, but the following usually helps when i have experienced problems with the frontend build

rm -rf node_modules
npm install
mvn clean
3

Unfortunately it doesnā€™t help here :frowning:

Iā€™ve tried :

  • Wiping out node_modules
  • Wiping out the entire workspace on Jenkins(where the build occurs)
  • Purging all dependencies, which forced Maven to re-download everything from Nexus

And still, I keep getting those things (for all the modules,but thatā€™s basically the same error everywhere)

ERROR in ../node_modules/@vaadin/vaadin-app-layout/src/vaadin-app-layout.js?babel-target=es5
Module build failed (from ../node_modules/babel-loader/lib/index.js):
ReferenceError: .../node_modules/@vaadin/vaadin-app-layout/src/vaadin-app-layout.js: Unknown helper createSuper

EDIT : the issue disappeared when building on another Jenkins server. It is strange, because the previous one always worked fine for the past year. Any idea what could have happened?

4

Quentin,

did you try to delete the maven repository completely (remove the .m2 directory contents?