migrate frontend

web/src/labs/html2image/convertResourceToDataURL.ts

@@ -0,0 +1,21 @@
+const cachedResource = new Map<string, string>();
+
+function convertResourceToDataURL(url: string, useCache = true): Promise<string> {
+  if (useCache && cachedResource.has(url)) {
+    return Promise.resolve(cachedResource.get(url) as string);
+  }
+
+  return new Promise(async (resolve) => {
+    const res = await fetch(url);
+    const blob = await res.blob();
+    var reader = new FileReader();
+    reader.onloadend = () => {
+      const base64Url = reader.result as string;
+      cachedResource.set(url, base64Url);
+      resolve(base64Url);
+    };
+    reader.readAsDataURL(blob);
+  });
+}
+
+export default convertResourceToDataURL;