From baa93cb371bfb766a290b5626f15421faf58d00e Mon Sep 17 00:00:00 2001
From: Elian Doran <contact@eliandoran.me>
Date: Sun, 5 Apr 2026 22:14:01 +0300
Subject: [PATCH] chore(ocr): expose needed dependencies

---
 apps/server/scripts/build.ts                  |  4 ++++
 .../ocr/processors/image_processor.ts         | 19 +++++++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/apps/server/scripts/build.ts b/apps/server/scripts/build.ts
index 9fa1f9cb83..73a3aeaee3 100644
--- a/apps/server/scripts/build.ts
+++ b/apps/server/scripts/build.ts
@@ -12,6 +12,10 @@ async function main() {
 
     // Copy node modules dependencies
     build.copyNodeModules([ "better-sqlite3", "bindings", "file-uri-to-path" ]);
+
+    // Tesseract.js worker runs in a separate worker_thread and needs its
+    // source files (+ WASM core) on disk — they cannot be bundled.
+    build.copyNodeModules([ "tesseract.js", "tesseract.js-core", "wasm-feature-detect" ]);
     build.copy("/node_modules/ckeditor5/dist/ckeditor5-content.css", "ckeditor5-content.css");
 
     build.buildFrontend();
diff --git a/apps/server/src/services/ocr/processors/image_processor.ts b/apps/server/src/services/ocr/processors/image_processor.ts
index 15bfe78085..a7a09acd85 100644
--- a/apps/server/src/services/ocr/processors/image_processor.ts
+++ b/apps/server/src/services/ocr/processors/image_processor.ts
@@ -1,9 +1,11 @@
 import fs from 'fs';
+import path from 'path';
 import Tesseract from 'tesseract.js';
 
 import dataDirs from '../../data_dir.js';
 import log from '../../log.js';
 import options from '../../options.js';
+import { getResourceDir, isDev } from '../../utils.js';
 import { OCRProcessingOptions,OCRResult } from '../ocr_service.js';
 import { FileProcessor } from './file_processor.js';
 
@@ -79,14 +81,27 @@ export class ImageProcessor extends FileProcessor {
         fs.mkdirSync(dataDirs.OCR_CACHE_DIR, { recursive: true });
 
         log.info(`Initializing Tesseract worker for language(s): ${language}`);
-        this.worker = await Tesseract.createWorker(language, 1, {
+
+        const workerOptions: Record<string, unknown> = {
             cachePath: dataDirs.OCR_CACHE_DIR,
             logger: (m: { status: string; progress: number }) => {
                 if (m.status === 'recognizing text') {
                     log.info(`Image OCR progress (${language}): ${Math.round(m.progress * 100)}%`);
                 }
             }
-        });
+        };
+
+        // In production the server is bundled, so tesseract.js's default
+        // __dirname-based worker path is wrong. Point it at the copy we
+        // place in dist/node_modules during the build step.
+        if (!isDev) {
+            workerOptions.workerPath = path.join(
+                getResourceDir(),
+                'node_modules', 'tesseract.js', 'src', 'worker-script', 'node', 'index.js'
+            );
+        }
+
+        this.worker = await Tesseract.createWorker(language, 1, workerOptions);
         this.currentLanguage = language;
     }