Bump to v4.0.0.

internal/createFlow.js

@@ -1,8 +1,10 @@
 import LodashWrapper from './LodashWrapper';
+import baseFlatten from './baseFlatten';
 import getData from './getData';
 import getFuncName from './getFuncName';
-import isArray from '../lang/isArray';
+import isArray from '../isArray';
 import isLaziable from './isLaziable';
+import rest from '../rest';
 
 /** Used to compose bitmasks for wrapper metadata. */
 var CURRY_FLAG = 8,
@@ -24,23 +26,26 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @returns {Function} Returns the new flow function.
  */
 function createFlow(fromRight) {
-  return function() {
-    var wrapper,
-        length = arguments.length,
-        index = fromRight ? length : -1,
-        leftIndex = 0,
-        funcs = Array(length);
+  return rest(function(funcs) {
+    funcs = baseFlatten(funcs);
 
-    while ((fromRight ? index-- : ++index < length)) {
-      var func = funcs[leftIndex++] = arguments[index];
+    var length = funcs.length,
+        index = length,
+        prereq = LodashWrapper.prototype.thru;
+
+    if (fromRight) {
+      funcs.reverse();
+    }
+    while (index--) {
+      var func = funcs[index];
       if (typeof func != 'function') {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
-      if (!wrapper && LodashWrapper.prototype.thru && getFuncName(func) == 'wrapper') {
-        wrapper = new LodashWrapper([], true);
+      if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
+        var wrapper = new LodashWrapper([], true);
       }
     }
-    index = wrapper ? -1 : length;
+    index = wrapper ? index : length;
     while (++index < length) {
       func = funcs[index];
 
@@ -68,7 +73,7 @@ function createFlow(fromRight) {
       }
       return result;
     };
-  };
+  });
 }
 
 export default createFlow;