Remove toSource.

.internal/getTag.js

@@ -1,5 +1,4 @@
 import baseGetTag from './baseGetTag.js'
-import toSource from './toSource.js'
 
 /** `Object#toString` result references. */
 const dataViewTag = '[object DataView]'
@@ -10,11 +9,11 @@ const setTag = '[object Set]'
 const weakMapTag = '[object WeakMap]'
 
 /** Used to detect maps, sets, and weakmaps. */
-const dataViewCtorString = toSource(DataView)
+const dataViewCtorString = `${ DataView }`
-const mapCtorString = toSource(Map)
+const mapCtorString = `${ Map }`
-const promiseCtorString = toSource(Promise)
+const promiseCtorString = `${ Promise }`
-const setCtorString = toSource(Set)
+const setCtorString = `${ Set }`
-const weakMapCtorString = toSource(WeakMap)
+const weakMapCtorString = `${ WeakMap }`
 
 /**
  * Gets the `toStringTag` of `value`.
@@ -34,7 +33,7 @@ if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
   getTag = (value) => {
     const result = baseGetTag(value)
     const Ctor = result == objectTag ? value.constructor : undefined
-    const ctorString = Ctor ? toSource(Ctor) : ''
+    const ctorString = Ctor ? `${ Ctor }` : ''
 
     if (ctorString) {
       switch (ctorString) {

.internal/toSource.js

@@ -1,23 +0,0 @@
-/** Used to resolve the decompiled source of functions. */
-const funcToString = Function.prototype.toString
-
-/**
- * Converts `func` to its source code.
- *
- * @private
- * @param {Function} func The function to convert.
- * @returns {string} Returns the source code.
- */
-function toSource(func) {
-  if (func != null) {
-    try {
-      return funcToString.call(func)
-    } catch (e) {}
-    try {
-      return `${ func }`
-    } catch (e) {}
-  }
-  return ''
-}
-
-export default toSource

isNative.js

@@ -1,6 +1,4 @@
-import isFunction from './isFunction.js'
 import isObject from './isObject.js'
-import toSource from './.internal/toSource.js'
 
 /**
  * Used to match `RegExp`
@@ -8,9 +6,6 @@ import toSource from './.internal/toSource.js'
  */
 const reRegExpChar = /[\\^$.*+?()[\]{}|]/g
 
-/** Used to detect host constructors (Safari). */
-const reIsHostCtor = /^\[object .+?Constructor\]$/
-
 /** Used to detect if a method is native. */
 const reIsNative = RegExp(`^${
   Function.prototype.toString.call(Object.prototype.hasOwnProperty)
@@ -35,11 +30,7 @@ const reIsNative = RegExp(`^${
  * // => false
  */
 function isNative(value) {
-  if (!isObject(value)) {
+  return isObject(value) && reIsNative.test(value)
-    return false
-  }
-  const pattern = isFunction(value) ? reIsNative : reIsHostCtor
-  return pattern.test(toSource(value))
 }
 
 export default isNative