Assume Symbol is always defined (#4111)

.internal/baseGetTag.js

@@ -1,7 +1,7 @@
 const objectProto = Object.prototype
 const hasOwnProperty = objectProto.hasOwnProperty
 const toString = objectProto.toString
-const symToStringTag = typeof Symbol != 'undefined' ? Symbol.toStringTag : undefined
+const symToStringTag = Symbol.toStringTag
 
 /**
  * The base implementation of `getTag` without fallbacks for buggy environments.
@@ -14,7 +14,7 @@ function baseGetTag(value) {
   if (value == null) {
     return value === undefined ? '[object Undefined]' : '[object Null]'
   }
-  if (!(symToStringTag && symToStringTag in Object(value))) {
+  if (!(symToStringTag in Object(value))) {
     return toString.call(value)
   }
   const isOwn = hasOwnProperty.call(value, symToStringTag)

.internal/baseToString.js

@@ -4,8 +4,7 @@ import isSymbol from '../isSymbol.js'
 const INFINITY = 1 / 0
 
 /** Used to convert symbols to primitives and strings. */
-const symbolProto = Symbol ? Symbol.prototype : undefined
-const symbolToString = symbolProto ? symbolProto.toString : undefined
+const symbolToString = Symbol.prototype.toString
 
 /**
  * The base implementation of `toString` which doesn't convert nullish

.internal/cloneSymbol.js

@@ -9,7 +9,7 @@ const symbolValueOf = Symbol.prototype.valueOf
  * @returns {Object} Returns the cloned symbol object.
  */
 function cloneSymbol(symbol) {
-  return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {}
+  return Object(symbolValueOf.call(symbol))
 }
 
 export default cloneSymbol

.internal/equalByTag.js

@@ -22,8 +22,7 @@ const arrayBufferTag = '[object ArrayBuffer]'
 const dataViewTag = '[object DataView]'
 
 /** Used to convert symbols to primitives and strings. */
-const symbolProto = Symbol ? Symbol.prototype : undefined
-const symbolValueOf = symbolProto ? symbolProto.valueOf : undefined
+const symbolValueOf = Symbol.prototype.valueOf
 
 /**
  * A specialized version of `baseIsEqualDeep` for comparing objects of

.internal/isFlattenable.js

@@ -12,7 +12,7 @@ const spreadableSymbol = Symbol.isConcatSpreadable
  */
 function isFlattenable(value) {
   return Array.isArray(value) || isArguments(value) ||
-    !!(spreadableSymbol && value && value[spreadableSymbol])
+    !!(value && value[spreadableSymbol])
 }
 
 export default isFlattenable

toArray.js

@@ -13,7 +13,7 @@ const mapTag = '[object Map]'
 const setTag = '[object Set]'
 
 /** Built-in value references. */
-const symIterator = Symbol ? Symbol.iterator : undefined
+const symIterator = Symbol.iterator
 
 /**
  * Converts `value` to an array.

toString.js

@@ -5,8 +5,7 @@ import isSymbol from './isSymbol.js'
 const INFINITY = 1 / 0
 
 /** Used to convert symbols to primitives and strings. */
-const symbolProto = Symbol ? Symbol.prototype : undefined
-const symbolToString = symbolProto ? symbolProto.toString : undefined
+const symbolToString = Symbol.prototype.toString
 
 /**
  * Converts `value` to a string. An empty string is returned for `null`