source: frontend/node_modules/es-abstract/2017/RegExpExec.js

'use strict';

var $TypeError = require('es-errors/type');
var isObject = require('es-object-atoms/isObject');
var regexExec = require('call-bound')('RegExp.prototype.exec');

var Call = require('./Call');
var Get = require('./Get');
var IsCallable = require('./IsCallable');

// https://262.ecma-international.org/6.0/#sec-regexpexec

module.exports = function RegExpExec(R, S) {
        if (!isObject(R)) {
                throw new $TypeError('Assertion failed: `R` must be an Object');
        }
        if (typeof S !== 'string') {
                throw new $TypeError('Assertion failed: `S` must be a String');
        }
        var exec = Get(R, 'exec');
        if (IsCallable(exec)) {
                var result = Call(exec, R, [S]);
                if (result === null || isObject(result)) {
                        return result;
                }
                throw new $TypeError('"exec" method must return `null` or an Object');
        }
        return regexExec(R, S);
};