Add appPath option to @types/gm (#39348)

types/gm/gm-tests.ts

@@ -370,7 +370,10 @@ gm(src).toBuffer(format, (err, buffer) => {
 const imageMagick = gm.subClass({ imageMagick: true });
 readStream = imageMagick(src)
 	.adjoin()
-	.stream();
+    .stream();
+
+const customGm = gm.subClass({ appPath: '' });
+readStream = customGm(src).stream();
 
 const passStream = imageMagick(readStream).stream();
 

types/gm/index.d.ts

@@ -15,6 +15,7 @@ declare function m(width: number, height: number, color?: string): m.State;
 
 declare namespace m {
     interface ClassOptions {
+        appPath?: string;
         imageMagick?: boolean;
         nativeAutoOrient?: boolean;
     }