Add test and prettier

Author: Nathan Gobinet

packages/jsondiffpatch/src/formatters/jsonpatch.ts

@@ -102,13 +102,13 @@ class JSONFormatter extends BaseFormatter<JSONFormatterContext, Op[]> {
 
     context.buildPath = function (path: (string | number)[]) {
       return path.map((path) => this.escapePath!(path)).join('/');
-    }
-  
+    };
+
     context.escapePath = function (path: string | number) {
       if (typeof path !== 'string') return path.toString();
       if (path.indexOf('/') === -1 && path.indexOf('~') === -1) return path;
       return path.replace(/~/g, '~0').replace(/\//g, '~1');
-    }
+    };
   }
 
   typeFormattterErrorFormatter(context: JSONFormatterContext, err: unknown) {

packages/jsondiffpatch/test/index.spec.ts

@@ -606,6 +606,12 @@ describe('DiffPatcher', () => {
         });
         expectFormat(before, after, diff);
       });
+
+      it('should escape the property name', () => {
+        expectFormat({ 'tree/item': 1 }, { 'tree/item': 2 }, [
+          replaceOp('/tree~1item', 2),
+        ]);
+      });
     });
 
     describe('html', () => {