RegExpHasFlag.jsā¢1.1 kB
'use strict';
var GetIntrinsic = require('get-intrinsic');
var callBound = require('call-bound');
var $TypeError = require('es-errors/type');
var isObject = require('es-object-atoms/isObject');
var $RegExpPrototype = GetIntrinsic('%RegExp.prototype%');
var SameValue = require('./SameValue');
var $indexOf = callBound('String.prototype.indexOf');
var hasRegExpMatcher = require('is-regex');
var getFlags = require('regexp.prototype.flags');
// https://262.ecma-international.org/13.0/#sec-regexphasflag
module.exports = function RegExpHasFlag(R, codeUnit) {
if (typeof codeUnit !== 'string' || codeUnit.length !== 1) {
throw new $TypeError('Assertion failed: `string` must be a code unit - a String of length 1');
}
if (!isObject(R)) {
throw new $TypeError('Assertion failed: Type(R) is not Object');
}
if (!hasRegExpMatcher(R)) { // step 2
if (SameValue(R, $RegExpPrototype)) {
return void undefined; // step 2.a
}
throw new $TypeError('`R` must be a RegExp object'); // step 2.b
}
var flags = getFlags(R); // step 3
return $indexOf(flags, codeUnit) > -1; // steps 4-5
};