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The grid (core) ยท console.warn

createUrlSource needs a URL string; the grid will stay empty.

Printed by The grid (core), prefixed [lattice], since 1.36.0.

Warnings referencesource.url.url

Identifier
source.url.url
Raised by
The grid (core)
Since
1.36.0

What happened

The URL source was constructed with no URL, so there is nothing to fetch and no rows are ever produced.

The fix

Pass the URL as the first argument.

The smallest fix

createUrlSource('/data/rows.ndjson', { batchSize: 5000 });

Reference

Covered in full at the API reference.