Failed to import proj4 correctly

[arbakker]

Failing module

Imported module does not work as intended, see also openlayers/openlayers#15274 on OpenLayers issue tracker.

• GitHub: see https://github.com/arbakker/ol-proj4-esm-issue/tree/master/failing-esm-example for a code example reproducing the issue
• npm:
  • https://npmjs.com/package/ol
  • https://npmjs.com/package/proj4

The issue lies in the interaction between the ol and proj4 packages. ol uses coordinate reference system (CRS) definitions that have been defined in proj4. But using esm.sh ol fails to use the CRS definitions defined in proj4.

Error message

Coordinates reprojected through openlayers interface are not reprojected correct:

It should look like this:

Using Skypack CDN the failing-esm-example does actually work.

Additional info

• esm.sh version: current prod
• Browser version: firefox 118.0.2 (64-bit)

[ije]

@arbakker thanks for the details hug help! i just dig a bit, this happens because esm.sh bundle code by default for reducing network requests that breaks the slideEffect(skypack works since its running in non bundling mode)

[ije]

i just added a patch to fix this, the testing https://github.com/esm-dev/esm.sh/blob/main/test/issue-754/issue-754.test.ts is passed. should work in next build version(will update asap).

[arbakker]

Forgot about this, I just checked and works as expected now. Thanks for the fix!