fix(compat/isEmpty): handle functions with own enumerable properties

src/compat/predicate/isEmpty.spec.ts

@@ -33,6 +33,13 @@
     expect(isEmpty('a')).toBe(false);
   });
 
+  it('should return `false` for functions with own enumerable properties', () => {
+    function transaction() {}
+    transaction.commit = () => {};
+
+    expect(isEmpty(transaction)).toBe(false);
+  });
+
   it('should work with an object that has a `length` property', () => {
     expect(isEmpty({ length: 0 })).toBe(false);
   });
@@ -52,7 +59,7 @@
   });
 
   it('should work with jQuery/MooTools DOM query collections', () => {
     function Foo(this: any, elements: any) {
       Array.prototype.push.apply(this, elements);
     }
     Foo.prototype = { length: 0, splice: Array.prototype.splice };

src/compat/predicate/isEmpty.ts

@@ -6,16 +6,16 @@
 
 declare let Buffer:
   | {
       isBuffer: (a: any) => boolean;
     }
   | undefined;
 
 export function isEmpty<T extends { __trapAny: any }>(value?: T): boolean;
 export function isEmpty(value: string): value is '';
 export function isEmpty(value: Map<any, any> | Set<any> | ArrayLike<any> | null | undefined): boolean;
 export function isEmpty(value: object): boolean;
 export function isEmpty<T extends object>(value: T | null | undefined): value is EmptyObjectOf<T> | null | undefined;
 export function isEmpty(value?: any): boolean;
 
 /**
  * Checks if a given value is empty.
@@ -51,7 +51,7 @@
   // Objects like { "length": 0 } are not empty in lodash
   if (isArrayLike(value)) {
     if (
       typeof (value as any).splice !== 'function' &&
       typeof value !== 'string' &&
       (typeof Buffer === 'undefined' || !Buffer.isBuffer(value)) &&
       !isTypedArray(value) &&
@@ -63,7 +63,7 @@
     return value.length === 0;
   }
 
-  if (typeof value === 'object') {
+  if (typeof value === 'object' || typeof value === 'function') {
     if (value instanceof Map || value instanceof Set) {
       return value.size === 0;
     }