react app

react-app/node_modules/core-js/modules/$.string-at.js

@@ -0,0 +1,17 @@
+var toInteger = require('./$.to-integer')
+  , defined   = require('./$.defined');
+// true  -> String#at
+// false -> String#codePointAt
+module.exports = function(TO_STRING){
+  return function(that, pos){
+    var s = String(defined(that))
+      , i = toInteger(pos)
+      , l = s.length
+      , a, b;
+    if(i < 0 || i >= l)return TO_STRING ? '' : undefined;
+    a = s.charCodeAt(i);
+    return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff
+      ? TO_STRING ? s.charAt(i) : a
+      : TO_STRING ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000;
+  };
+};