Five tests in usePdfRenderer.svelte.test.ts called createPdfRenderer() without a libLoader, causing init() to dynamically import pdfjs-dist in the browser. Every dynamic import goes through Playwright's route handler, which calls resolveManualMock via birpc to check for mocks. If the RPC closes during teardown while one of these imports is in flight, the birpc race fires — even though pdfjs-dist was never explicitly vi.mock()-ed. Replace all bare createPdfRenderer() calls that invoke init() with createPdfRenderer(makeFakeLibLoader()), identical to the pattern already used in PdfViewer.svelte.test.ts. No real module loads, no route-handler calls, no birpc exposure. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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