| 'use strict'; | 
|   | 
| var GetIntrinsic = require('get-intrinsic'); | 
|   | 
| var $TypeError = GetIntrinsic('%TypeError%'); | 
|   | 
| var IsIntegralNumber = require('./IsIntegralNumber'); | 
| var Type = require('./Type'); | 
|   | 
| var callBound = require('call-bind/callBound'); | 
|   | 
| var $slice = callBound('String.prototype.slice'); | 
|   | 
| // https://262.ecma-international.org/12.0/#substring | 
| module.exports = function substring(S, inclusiveStart, exclusiveEnd) { | 
|     if (Type(S) !== 'String' || !IsIntegralNumber(inclusiveStart) || (arguments.length > 2 && !IsIntegralNumber(exclusiveEnd))) { | 
|         throw new $TypeError('`S` must be a String, and `inclusiveStart` and `exclusiveEnd` must be integers'); | 
|     } | 
|     return $slice(S, inclusiveStart, arguments.length > 2 ? exclusiveEnd : S.length); | 
| }; |