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server/util/getBase64FromFileObject.ts

@@ -0,0 +1,17 @@
+import { unwrap } from "./unwrap";
+
+//https://stackoverflow.com/questions/36280818/how-to-convert-file-to-base64-in-javascript
+export function getBase64FromFileObject(file: File): Promise<string> {
+    return new Promise((resolve, reject) => {
+        const reader = new FileReader();
+        reader.readAsDataURL(file);
+        reader.onload = () => {
+            let encoded = unwrap(reader.result).toString().replace(/^data:(.*,)?/, '');
+            if ((encoded.length % 4) > 0) {
+                encoded += '='.repeat(4 - (encoded.length % 4));
+            }
+            resolve(encoded);
+        };
+        reader.onerror = error => reject(error);
+    });
+}