feat: handle objects with an anonymous prototype (#49)

index.js

@@ -151,9 +151,14 @@ export function inspect(value, options) {
     return inspectHTMLElement(value, options)
   }
 
-  // If it is a class, inspect it like an object but add the constructor name
-  if ('constructor' in value && value.constructor !== Object) {
-    return inspectClass(value, options)
+  if ('constructor' in value) {
+    // If it is a class, inspect it like an object but add the constructor name
+    if (value.constructor !== Object) {
+      return inspectClass(value, options)
+    }
+
+    // If it is an object with an anonymous prototype, display it as an object.
+    return inspectObject(value, options)
   }
 
   // We have run out of options! Just stringify the value

test/objects.js

@@ -35,6 +35,16 @@ for (const [suite, inspect] of Object.entries({
       })
     }
 
+    it('returns `{}` for empty objects with an anonoymous prototype', () => {
+      expect(inspect(Object.create({ a: 1 }))).to.equal('{}')
+    })
+
+    it("shows objects' own properties for objects with an anonoymous prototype", () => {
+      const obj = Object.create({ a: 1 })
+      obj.b = 2
+      expect(inspect(obj)).to.equal('{ b: 2 }')
+    })
+
     describe('truncate', () => {
       it('returns the full representation when truncate is over string length', () => {
         expect(inspect({ a: 1, b: 2, c: 3 }, { truncate: 20 })).to.equal('{ a: 1, b: 2, c: 3 }')