Add margin option to trim operation #4480

lib/index.d.ts

@@ -1606,6 +1606,8 @@ declare namespace sharp {
         threshold?: number | undefined;
         /** Does the input more closely resemble line art (e.g. vector) rather than being photographic? (optional, default false) */
         lineArt?: boolean | undefined;
+        /** Leave a margin around trimmed content, value is in pixels. (optional, default 0) */
+        margin?: number | undefined;
     }
 
     interface RawOptions {