Turbopack worker fails to load

“Only maplibre-gl-shared.<hash>.mjs is emitted, so the worker's first import 404s and the worker never starts.”

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I hit this bug: rapsheet.dev/sheets/next-js/issues/4121/file
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Turbopack-emitted worker fails to load due to unrewritten sibling import. Worker created via new Worker(new URL(..., import.meta.url)) keeps "./maplibre-gl-shared.mjs" specifier, which 404s; MapLibre map never renders.

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Where: Turbopack bundling
Error text: Error: Worker failed to load. Check that the worker URL is correct.
Versions: 16.4.0-canary.60
Platforms: macOS
How bad: Breaks a normal workflow.

Not quite your bug?

Build hangs on worker import cycle3 people

Original reports2, newest first

Oct 5, 2026MapLibre worker fails to load in Turbopack although generated worker asset is accessibleOn GitHub#99674
Sep 1, 2026Turbopack: a worker emitted via new Worker(new URL('./x.mjs', import.meta.url)) keeps an unrewritten sibling import, so the worker never loadsOn GitHub#98137

Turbopack worker fails to load

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Not quite your bug?

Original reports2, newest first

Do you work on Next.js?