VectorLayers are not working

[BHDBvde]

Describe the bug
VectorLayers are not working in a Polymer 3 project.
This is not working after this change: #10385
Polymer serve gives an error in the console. TypeError: _rbush.default is not a constructor

I don't think it is good to use transpiled files: (https://www.polymer-project.org/blog/2018-05-02-roadmap-faq#dependencies-not-compatible-with-the-native-module-loader)

To Reproduce

1. Unzip olinpolymer.zip
2. Go to the unpacked folder
3. npm install
4. npm run polymerserve
5. See the error in the browser console
   Expected behavior
   Seeing a map.

[ahocevar]

Until all our dependencies come packaged as ES modules (like OpenLayers does already), you'll have to use a bundler. No need to transpile though.

[BHDBvde]

After reading #8974, I think I understand it. But can you explain why src/structs/RBush.js also uses this import: "import RBush_ from 'rbush/rbush.js';"
I would think you should use the rbush/index.js file because that is the untranspiled file.

[ahocevar]

If we import the untranspiled file, then users have to configure their bundlers to transpile dependencies, which is not common practice.

[BHDBvde]

Yes but I'm talking about the untranspiled es6 modules in src/ .

[ahocevar]

That might be doable. If you have any idea how (e.g. with a change in build/tsconfig-build.json, which is responsible for the transpilation), you could submit a pull request.

[BHDBvde]

I don't think that is possible with an change in de tsconfig-build. And for now I do not have another idea.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.