Mirrors/Stirling-PDF
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Lazily load PDF.js to reduce chunk size

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This commit is contained in:
James Brunton 2025-12-18 14:34:20 +00:00
parent c6762532e5
commit 7f63354e4e
1 changed files with 22 additions and 6 deletions
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28
frontend/src/core/services/pdfWorkerManager.ts
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@ -3,9 +3,14 @@
*
* Prevents infinite worker creation by managing PDF.js workers globally
* and ensuring proper cleanup when operations complete.
*
* Uses dynamic imports to avoid bundling PDF.js in main bundle.
*/
import { GlobalWorkerOptions, getDocument, PDFDocumentProxy } from 'pdfjs-dist/legacy/build/pdf.mjs';
// Dynamic import types for TypeScript
type PDFDocumentProxy = import('pdfjs-dist').PDFDocumentProxy;
type GlobalWorkerOptions = typeof import('pdfjs-dist').GlobalWorkerOptions;
type GetDocumentFn = typeof import('pdfjs-dist').getDocument;
class PDFWorkerManager {
private static instance: PDFWorkerManager;
@ -13,9 +18,10 @@ class PDFWorkerManager {
private workerCount = 0;
private maxWorkers = 10; // Limit concurrent workers
private isInitialized = false;
private pdfjsLib: { GlobalWorkerOptions: GlobalWorkerOptions; getDocument: GetDocumentFn } | null = null;
private constructor() {
this.initializeWorker();
// Don't initialize worker in constructor - defer until first use
}
static getInstance(): PDFWorkerManager {
@ -26,11 +32,14 @@ class PDFWorkerManager {
}
/**
* Initialize PDF.js worker once globally
* Lazy-load PDF.js library and initialize worker once globally
*/
private initializeWorker(): void {
private async initializeWorker(): Promise<void> {
if (!this.isInitialized) {
GlobalWorkerOptions.workerSrc = new URL(
// Dynamic import - only loads when first PDF operation is needed
this.pdfjsLib = await import('pdfjs-dist/legacy/build/pdf.mjs');
this.pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
'pdfjs-dist/legacy/build/pdf.worker.min.mjs',
import.meta.url
).toString();
@ -51,6 +60,13 @@ class PDFWorkerManager {
verbosity?: number;
} = {}
): Promise<PDFDocumentProxy> {
// Lazy-load PDF.js on first use
await this.initializeWorker();
if (!this.pdfjsLib) {
throw new Error('Failed to load PDF.js library');
}
// Wait if we've hit the worker limit
if (this.activeDocuments.size >= this.maxWorkers) {
await this.waitForAvailableWorker();
@ -68,7 +84,7 @@ class PDFWorkerManager {
pdfData = data; // Pass through as-is
}
const loadingTask = getDocument(
const loadingTask = this.pdfjsLib.getDocument(
typeof pdfData === 'string' ? {
url: pdfData,
disableAutoFetch: options.disableAutoFetch ?? true,