ed12a54339
loadFile() reads fileUrl synchronously before its first await. When called from a \$effect, Svelte tracks that read and re-runs the effect every time fileUrl changes — i.e. after every successful load — causing an infinite cycle of file fetches and PdfViewer remounts. Fix: wrap the fileUrl read in untrack() so callers never accidentally subscribe to fileUrl changes. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
48 lines
1.1 KiB
TypeScript
48 lines
1.1 KiB
TypeScript
import { untrack } from 'svelte';
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export function createFileLoader() {
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let fileUrl = $state('');
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let isLoading = $state(false);
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let fileError = $state('');
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async function loadFile(url: string): Promise<void> {
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isLoading = true;
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fileError = '';
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// untrack prevents callers ($effect) from accidentally subscribing to fileUrl.
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// Without it, the calling effect would re-run every time fileUrl changes (i.e.
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// on every successful load), creating an infinite load loop.
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const prev = untrack(() => fileUrl);
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if (prev) URL.revokeObjectURL(prev);
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fileUrl = '';
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try {
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const response = await fetch(url);
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if (!response.ok) throw new Error('Failed to load file');
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const blob = await response.blob();
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fileUrl = URL.createObjectURL(blob);
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} catch {
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fileError = 'Vorschau konnte nicht geladen werden.';
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} finally {
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isLoading = false;
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}
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}
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function destroy(): void {
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if (fileUrl) URL.revokeObjectURL(fileUrl);
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}
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return {
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get fileUrl() {
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return fileUrl;
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},
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get isLoading() {
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return isLoading;
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},
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get fileError() {
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return fileError;
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},
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loadFile,
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destroy
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};
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}
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