diff --git a/frontend/src/lib/document/viewer/PdfViewer.svelte b/frontend/src/lib/document/viewer/PdfViewer.svelte
index dc942600..d79d16fc 100644
--- a/frontend/src/lib/document/viewer/PdfViewer.svelte
+++ b/frontend/src/lib/document/viewer/PdfViewer.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
 import { onMount, setContext, untrack } from 'svelte';
-import { createPdfRenderer } from '$lib/document/viewer/usePdfRenderer.svelte';
+import { createPdfRenderer, type LibLoader } from '$lib/document/viewer/usePdfRenderer.svelte';
 import PdfControls from './PdfControls.svelte';
 import AnnotationLayer from '$lib/document/annotation/AnnotationLayer.svelte';
 import type { Annotation } from '$lib/shared/types';
@@ -36,7 +36,7 @@ let {
 	documentFileHash?: string | null;
 	annotationsDimmed?: boolean;
 	flashAnnotationId?: string | null;
-	libLoader?: Parameters<typeof createPdfRenderer>[0];
+	libLoader?: LibLoader;
 } = $props();
 
 const renderer = untrack(() => createPdfRenderer(libLoader));
diff --git a/frontend/src/lib/document/viewer/PdfViewer.svelte.spec.ts b/frontend/src/lib/document/viewer/PdfViewer.svelte.spec.ts
index 39e61c45..c8e06810 100644
--- a/frontend/src/lib/document/viewer/PdfViewer.svelte.spec.ts
+++ b/frontend/src/lib/document/viewer/PdfViewer.svelte.spec.ts
@@ -1,7 +1,7 @@
 import { vi, describe, it, expect, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
 import { page } from 'vitest/browser';
-import type { createPdfRenderer } from '$lib/document/viewer/usePdfRenderer.svelte';
+import type { LibLoader } from '$lib/document/viewer/usePdfRenderer.svelte';
 import PdfViewer from './PdfViewer.svelte';
 
 afterEach(cleanup);
@@ -28,7 +28,7 @@ function makeFakePdfjsLib() {
 	} as unknown as typeof import('pdfjs-dist');
 }
 
-function makeFakeLibLoader(): Parameters<typeof createPdfRenderer>[0] {
+function makeFakeLibLoader(): LibLoader {
 	const fakePdfjs = makeFakePdfjsLib();
 	return vi.fn().mockResolvedValue([fakePdfjs, { default: '' }] as const);
 }
diff --git a/frontend/src/lib/document/viewer/usePdfRenderer.svelte.ts b/frontend/src/lib/document/viewer/usePdfRenderer.svelte.ts
index c8e7d853..700984e9 100644
--- a/frontend/src/lib/document/viewer/usePdfRenderer.svelte.ts
+++ b/frontend/src/lib/document/viewer/usePdfRenderer.svelte.ts
@@ -1,6 +1,6 @@
 import type { PDFDocumentProxy, RenderTask } from 'pdfjs-dist';
 
-type LibLoader = () => Promise<readonly [typeof import('pdfjs-dist'), { default: string }]>;
+export type LibLoader = () => Promise<readonly [typeof import('pdfjs-dist'), { default: string }]>;
 
 const defaultLibLoader: LibLoader = () =>
 	Promise.all([import('pdfjs-dist'), import('pdfjs-dist/build/pdf.worker.min.mjs?url')]);