#166 Corrected check for valid image data. ArrayBuffers are now also …

…valid image data containers, as the type definitions suggest.

src/processTemplate.ts

@@ -727,9 +727,15 @@ const imageToContext = (ctx: Context, img: Image) => {
 };
 
 function validateImage(img: Image) {
-  if (!(img.data instanceof Buffer || typeof img.data === 'string')) {
+  if (
+    !(
+      img.data instanceof Buffer ||
+      img.data instanceof ArrayBuffer ||
+      typeof img.data === 'string'
+    )
+  ) {
     throw new Error(
-      'image .data property needs to be provided as an ArrayBuffer-equivalent or as a base64-encoded string'
+      'image .data property needs to be provided as Buffer, ArrayBuffer, or as a base64-encoded string'
     );
   }
   if (!ImageExtensions.includes(img.extension)) {

src/types.ts

@@ -170,7 +170,7 @@ export const ImageExtensions = [
 export type ImageExtension = typeof ImageExtensions[number];
 export type Image = {
   extension: ImageExtension;
-  data: ArrayBuffer | string;
+  data: Buffer | ArrayBuffer | string;
 };
 export type Links = { [id: string]: Link };
 export type Link = { url: string };