ESM: Tidied up recently added operations

src/core/operations/RenderImage.mjs

@@ -7,6 +7,7 @@
 import { fromBase64, toBase64 } from "../lib/Base64";
 import { fromHex } from "../lib/Hex";
 import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
 import Utils from "../Utils";
 import Magic from "../lib/Magic";
 
@@ -37,9 +38,7 @@ class RenderImage extends Operation {
             {
                 "match": "^(?:\\xff\\xd8\\xff|\\x89\\x50\\x4e\\x47|\\x47\\x49\\x46|.{8}\\x57\\x45\\x42\\x50|\\x42\\x4d)",
                 "flags": "",
-                "args": [
-                    "Raw"
-                ],
+                "args": ["Raw"],
                 "useful": true
             }
         ];
@@ -77,7 +76,7 @@ class RenderImage extends Operation {
         if (type && type.mime.indexOf("image") === 0) {
             dataURI += type.mime + ";";
         } else {
-            throw "Invalid file type";
+            throw new OperationError("Invalid file type");
         }
 
         // Add image data to URI