Problem with rollup: 'syntheticNamedExports: "__moduleExports"' needs an explicit export named "__moduleExports" that does not reexport an unresolved named export of the same module.

[TimSC]

I am having trouble with react-tiny-popover 7.1 using rollup 2.75.7. Searching for the error message reveals it has something to do with the fix for "Improve circular dependency execution order" in rollup/rollup#3840

rollup v2.75.7
bundles index.tsx, internal/InternalComponent.tsx, company/xyz/XyzComponent.tsx → ../flask_cc...
(!) Circular dependencies
qgis2web/layers.ts -> qgis2web/layerBases.ts -> qgis2web/layers.ts
App.tsx -> components/LayerControl.tsx -> App.tsx
qgis2web/tableControl.ts -> qgis2web/open_table.ts -> qgis2web/tableControl.ts
qgis2web/selectFeaturesControl.ts -> qgis2web/sumFeaturesControl.ts -> qgis2web/selectFeaturesControl.ts
qgis2web/tableControl.ts -> qgis2web/selectFeaturesControl.ts -> qgis2web/tableControl.ts
(!) Unresolved dependencies
https://rollupjs.org/guide/en/#warning-treating-module-as-external-dependency
https://cdn.jsdelivr.net/npm/wkx@0.4.6/dist/wkx.js (imported by components/KmlControl.tsx)
https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.5.0/proj4.js (imported by components/KmlControl.tsx)
https://epsg.io/102008.js (imported by components/KmlControl.tsx)
(!) Plugin replace: @rollup/plugin-replace: 'preventAssignment' currently defaults to false. It is recommended to set this option to `true`, as the next major version will default this option to `true`.
[!] Error: Module "node_modules/react-tiny-popover/dist/useElementRef.js" that is marked with 'syntheticNamedExports: "__moduleExports"' needs an explicit export named "__moduleExports" that does not reexport an unresolved named export of the same module.
node_modules/react-tiny-popover/dist/useElementRef.js
Error: Module "node_modules/react-tiny-popover/dist/useElementRef.js" that is marked with 'syntheticNamedExports: "__moduleExports"' needs an explicit export named "__moduleExports" that does not reexport an unresolved named export of the same module.
    at error (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:198:30)
    at Module.getSyntheticNamespace (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12690:20)
    at /home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12745:125
    at getOrCreate (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:2152:19)
    at Module.getVariableForExportName (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12745:17)
    at getVariableForExportNameRecursive (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12403:19)
    at Module.getVariableForExportName (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12708:32)
    at getVariableForExportNameRecursive (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12403:19)
    at Module.traceVariable (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:12912:35)
    at ModuleScope.findVariable (/home/tim/dev/front-end/react_app/node_modules/rollup/dist/shared/rollup.js:11566:39)

[TimSC]

Using the "export default" style at the end of each file seems to make it work. I'll have a look at synthetic named exports options in rollup next.

//exports.ArrowContainer = ArrowContainer; //commented out
export default ArrowContainer;