fix: handle slashes better when decycling (#90)

- needed by stoplightio/prism#1456

Author: pytlesk4

src/__tests__/decycle.spec.ts

@@ -83,19 +83,19 @@ describe('decycle', () => {
 
     const obj = {
       paths: {
-        '/circle': {
+        '/circle/foo': {
           obj2: {},
         },
       },
     };
-    obj.paths['/circle'].obj2 = obj2;
+    obj.paths['/circle/foo'].obj2 = obj2;
 
     expect(decycle(obj)).toEqual({
       paths: {
-        '/circle': {
+        '/circle/foo': {
           obj2: {
             circle: {
-              $ref: '#/paths/~1circle/obj2',
+              $ref: '#/paths/~1circle~1foo/obj2',
             },
           },
         },

src/decycle.ts

@@ -1,9 +1,9 @@
 import { isPlainObject } from './_utils';
-import { encodePointer } from './encodePointer';
+import { pathToPointer } from './pathToPointer';
 
 export const decycle = (obj: unknown, replacer?: (value: any) => any) => {
   const objs = new WeakMap<object, string>();
-  return (function derez(value: any, path: string) {
+  return (function derez(value: any, path: string[]) {
     // The new object or array
     let curObj: any;
 
@@ -15,22 +15,22 @@ export const decycle = (obj: unknown, replacer?: (value: any) => any) => {
       const oldPath = objs.get(value);
       // If the value is an object or array, look to see if we have already
       // encountered it. If so, return a {"$ref":PATH} object.
-      if (oldPath) return { $ref: encodePointer(oldPath) };
+      if (oldPath) return { $ref: oldPath };
 
-      objs.set(value, path);
+      objs.set(value, pathToPointer(path));
       // If it is an array, replicate the array.
       if (Array.isArray(value)) {
-        curObj = value.map((element, i) => derez(element, `${path}/${i}`));
+        curObj = value.map((element, i) => derez(element, [...path, String(i)]));
       } else {
         // It is an object, replicate the object.
         curObj = {};
         Object.keys(value).forEach(name => {
-          curObj[name] = derez(value[name], `${path}/${name}`);
+          curObj[name] = derez(value[name], [...path, name]);
         });
       }
       objs.delete(value);
       return curObj;
     }
     return value;
-  })(obj, '#');
+  })(obj, []);
 };