Ensure _.split works with emojis.

lodash.js

@@ -13560,7 +13560,18 @@
      * // => ['a', 'b']
      */
     function split(string, separator, limit) {
-      return toString(string).split(separator, limit);
+      string = toString(string);
+      if (string && (
+            typeof separator == 'string' ||
+            (separator != null && !isRegExp(separator))
+          )) {
+        separator += '';
+        if (separator == '' && reHasComplexSymbol.test(string)) {
+          var strSymbols = stringToArray(string);
+          return limit === undefined ? strSymbols : strSymbols.slice(0, limit < 0 ? 0 : limit);
+        }
+      }
+      return string.split(separator, limit);
     }
 
     /**

test/test.js

@@ -20092,7 +20092,7 @@
   QUnit.module('lodash.split');
 
   (function() {
-    QUnit.test('should support string split', function(assert) {
+    QUnit.test('should split a string by `separator`', function(assert) {
       assert.expect(3);
 
       var string = 'abcde';
@@ -20101,6 +20101,19 @@
       assert.deepEqual(_.split(string, '', 2), ['a', 'b']);
     });
 
+    QUnit.test('should return an array containing an empty string for empty values', function(assert) {
+      assert.expect(1);
+
+      var values = [, null, undefined, ''],
+          expected = lodashStable.map(values, lodashStable.constant(['']));
+
+      var actual = lodashStable.map(values, function(value, index) {
+        return index ? _.split(value) : _.split();
+      });
+
+      assert.deepEqual(actual, expected);
+    });
+
     QUnit.test('should allow mixed string and array prototype methods', function(assert) {
       assert.expect(1);
 
@@ -23238,7 +23251,7 @@
         thumbsUp = '\ud83d\udc4d';
 
     QUnit.test('should account for astral symbols', function(assert) {
-      assert.expect(26);
+      assert.expect(33);
 
       var allHearts = _.repeat(hearts, 10),
           chars = hearts + comboGlyph,
@@ -23259,7 +23272,17 @@
       assert.strictEqual(_.padEnd(string, 16, chars), string + chars + hearts);
 
       assert.strictEqual(_.size(string), 13);
-      assert.deepEqual(_.toArray(string), ['A', ' ', leafs, ',', ' ', comboGlyph, ',', ' ', 'a', 'n', 'd', ' ', rocket]);
+      assert.deepEqual(_.split(string, ' '), ['A', leafs + ',', comboGlyph + ',', 'and', rocket]);
+      assert.deepEqual(_.split(string, ' ', 3), ['A', leafs + ',', comboGlyph + ',']);
+      assert.deepEqual(_.split(string, undefined), [string]);
+      assert.deepEqual(_.split(string, undefined, 0), []);
+      assert.deepEqual(_.split(string, '', -1), []);
+
+      var expected = ['A', ' ', leafs, ',', ' ', comboGlyph, ',', ' ', 'a', 'n', 'd', ' ', rocket];
+
+      assert.deepEqual(_.split(string, ''), expected);
+      assert.deepEqual(_.split(string, '', 6), expected.slice(0, 6));
+      assert.deepEqual(_.toArray(string), expected);
 
       assert.strictEqual(_.trim(trimString, chars), string);
       assert.strictEqual(_.trimStart(trimString, chars), string + trimChars);