fix(compat): count string size by code points for multi-byte characters

src/compat/array/size.spec.ts

@@ -36,7 +36,7 @@
     expect(size(args)).toBe(3);
   });
 
   // it('should work with jQuery/MooTools DOM query collections', () => {
   //   function Foo(elements: unknown[]) {
   //     Array.prototype.push.apply(this, elements);
   //   }
@@ -66,6 +66,11 @@
     expect(size(str)).toBe(10);
   });
 
+  it('should count multi-byte characters in a string as single code points', () => {
+    expect(size('😀😁😂')).toBe(3);
+    expect(size('a😀b')).toBe(3);
+  });
+
   it('should return the `length` of array-like objects', () => {
     expect(size({ length: 3 })).toBe(3);
     expect(size({ 0: 'a', 1: 'b', length: 2 })).toBe(2);

src/compat/array/size.ts

@@ -1,6 +1,9 @@
 import { isNil } from '../../predicate/isNil.ts';
 import { isArrayLike } from '../predicate/isArrayLike.ts';
 
+// eslint-disable-next-line no-misleading-character-class
+const regexMultiByte = /[\u200d\ud800-\udfff\u0300-\u036f\ufe20-\ufe2f\u20d0-\u20ff\ufe0e\ufe0f]/;
+
 /**
  * Returns the length of an array, string, or object.
  *
@@ -43,11 +46,15 @@
  */
 export function size(collection: object | string | null | undefined): number;
 
 export function size(target: any): number {
   if (isNil(target)) {
     return 0;
   }
 
+  if (typeof target === 'string') {
+    return regexMultiByte.test(target) ? Array.from(target).length : target.length;
+  }
+
   if (isArrayLike(target)) {
     return target.length;
   }