node_modules/core-js/library/modules/$.string-context.js


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// helper for String#{startsWith, endsWith, includes}
var isRegExp = require('./$.is-regexp')
  , defined  = require('./$.defined');

module.exports = function(that, searchString, NAME){
  if(isRegExp(searchString))throw TypeError('String#' + NAME + " doesn't accept regex!");
  return String(defined(that));
};