From 5201148f9a963f52837307245178d88be96a09eb Mon Sep 17 00:00:00 2001
From: 3y3 <3y3@ya.ru>
Date: Fri, 27 Sep 2024 03:13:31 +0300
Subject: [PATCH] fix: Omit CORS errors - replace fetch with importScripts

---
 src/indexer/index.ts |  4 ++--
 src/worker/index.ts  | 33 +++++++++++++++------------------
 2 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/src/indexer/index.ts b/src/indexer/index.ts
index 78aabaf..7fd81f0 100644
--- a/src/indexer/index.ts
+++ b/src/indexer/index.ts
@@ -65,8 +65,8 @@ export class Indexer {
      * @returns {{index: Index, registry: Registry}}
      */
     release(lang: string) {
-        const index = JSON.stringify(this.indices[lang].build());
-        const registry = JSON.stringify(this.docs[lang]);
+        const index = 'self.indexData=' + JSON.stringify(this.indices[lang].build());
+        const registry = 'self.registry=' + JSON.stringify(this.docs[lang]);
 
         return {index, registry};
     }
diff --git a/src/worker/index.ts b/src/worker/index.ts
index fb72261..a510a09 100644
--- a/src/worker/index.ts
+++ b/src/worker/index.ts
@@ -17,6 +17,8 @@ declare const self: ServiceWorkerGlobalScope & {
     config?: WorkerConfig;
     api?: ISearchWorkerApi;
     language?: (lunr: unknown) => Builder.Plugin;
+    index: object;
+    registry: Registry;
 };
 
 const NOT_INITIALIZED = {
@@ -70,22 +72,23 @@ async function load(): Promise<[Index, Registry]> {
     }
 
     const promise: Promise<[Index, Registry]> = (async () => {
-        const [indexData, registry] = await Promise.all([
-            request<Index>(`${config.base}/${config.resources.index}`),
-            request<Registry>(`${config.base}/${config.resources.registry}`),
-        ]);
+        const scripts = [
+            `${config.base}/${config.resources.index}`,
+            `${config.base}/${config.resources.registry}`,
+            config.resources.language && `${config.base}/${config.resources.language}`,
+        ].filter(Boolean) as string[];
 
-        if (config.resources.language) {
-            importScripts(`${config.base}/${config.resources.language}`);
-        }
+        // Load resources using importScripts instead of fetch
+        // because fetch will produce CORS errors on file:// protocol
+        importScripts(...scripts);
 
-        if (self.language) {
-            self.language(lunr);
-        }
+        const {index, registry, language} = self;
 
-        const index = Index.load(indexData);
+        if (language) {
+            language(lunr);
+        }
 
-        return [index, registry];
+        return [Index.load(index), registry];
     })();
 
     promise.catch((error) => {
@@ -97,9 +100,3 @@ async function load(): Promise<[Index, Registry]> {
 
     return [index, registry];
 }
-
-async function request<T>(url: string): Promise<T> {
-    const request = await fetch(url);
-
-    return request.json();
-}