Bug fix: interceptAnyObject used in monitorAPI

src/interceptAnyObject.ts

@@ -1,34 +1,39 @@
 import _ from 'lodash'
 
+export type FunctionInterceptor = (name: string, original: Function) => Function
+export type PropertyInterceptor = (name: string, original: any) => any
+
 export interface AnyObject {
     [key: string]: any
 }
-export type FunctionInterceptor = (name: string, original: Function) => Function
-export type PropertyInterceptor = (name: string, original: any) => any
+const isPlainObject = (value: any): value is AnyObject => _.isPlainObject(value)
 
-export function interceptAnyObject<T extends AnyObject>(
+export function interceptAnyObject<T>(
     inner: T,
     onFunction?: FunctionInterceptor,
     onProperty?: PropertyInterceptor,
     includeNestedLevels?: number
 ): T {
-    const result = _.mapValues(inner, (original, key) => {
-        if (typeof original === 'function' && typeof onFunction === 'function') {
-            return onFunction(key, original)
-        }
-        if (includeNestedLevels && _.isObjectLike(original)) {
-            return interceptAnyObject(
-                original,
-                onFunction ? (name, func) => onFunction(`${key}.${name}`, func) : undefined,
-                onProperty ? (name, value) => onProperty(`${key}.${name}`, value) : undefined,
-                includeNestedLevels - 1
-            )
-        }
-        if (typeof onProperty === 'function') {
-            return onProperty(key, original)
-        }
-        return original
-    }) as T
+    if (isPlainObject(inner)) {
+        const result = _.mapValues(inner, (original, key) => {
+            if (typeof original === 'function' && typeof onFunction === 'function') {
+                return onFunction(key, original)
+            }
+            if (includeNestedLevels && _.isPlainObject(original)) {
+                return interceptAnyObject(
+                    original,
+                    onFunction ? (name, func) => onFunction(`${key}.${name}`, func) : undefined,
+                    onProperty ? (name, value) => onProperty(`${key}.${name}`, value) : undefined,
+                    includeNestedLevels - 1
+                )
+            }
+            if (typeof onProperty === 'function') {
+                return onProperty(key, original)
+            }
+            return original
+        }) as T
 
-    return result
+        return result
+    }
+    return inner
 }

src/monitorAPI.ts

@@ -39,7 +39,7 @@ export function monitorAPI<TAPI>(
             : () => true
 
     return interceptAnyObject(
-        api as any,
+        api,
         (funcName, originalFunc) => {
             if (!shouldMonitor(funcName)) {
                 console.log('DISABLED MONITORING>', funcName)

test/interceptAnyObject.spec.ts

@@ -1,5 +1,5 @@
 import _ from 'lodash'
-import { interceptAnyObject, FunctionInterceptor, PropertyInterceptor } from '../src/interceptAnyObject'
+import { FunctionInterceptor, interceptAnyObject, PropertyInterceptor } from '../src/interceptAnyObject'
 
 type LogSpy = jest.Mock<void, string[]>
 
@@ -184,4 +184,34 @@ describe('interceptAnyObject', () => {
         ])
         expect(nestedFuncLevelTwoRetVal).toBe(12345)
     })
+
+    it('should not intercept non object-like values - functions', () => {
+        const spy: LogSpy = jest.fn()
+        function real() {
+            return 'real'
+        }
+        const intercepted = interceptAnyObject(real, createFuncInterceptor(spy), createPropInterceptor(spy))
+        expect(intercepted()).toBe('real')
+    })
+
+    it('should not intercept non object-like values - primitives', () => {
+        const spy: LogSpy = jest.fn()
+        const real = 'real'
+        const intercepted = interceptAnyObject(real, createFuncInterceptor(spy), createPropInterceptor(spy))
+        expect(intercepted).toBe('real')
+    })
+
+    it('should not intercept non object-like values - arrays', () => {
+        const spy: LogSpy = jest.fn()
+        const real = ['real']
+        const intercepted = interceptAnyObject(real, createFuncInterceptor(spy), createPropInterceptor(spy))
+        expect(intercepted).toEqual(['real'])
+    })
+
+    it('should not intercept non object-like values - maps', () => {
+        const spy: LogSpy = jest.fn()
+        const real = new Map<string, string>([['key', 'value']])
+        const intercepted = interceptAnyObject(real, createFuncInterceptor(spy), createPropInterceptor(spy))
+        expect(intercepted.get('key')).toEqual('value')
+    })
 })