Edit File: UTF16DecodeSurrogatePair.js
'use strict'; var GetIntrinsic = require('get-intrinsic'); var $TypeError = GetIntrinsic('%TypeError%'); var $fromCharCode = GetIntrinsic('%String.fromCharCode%'); var isLeadingSurrogate = require('../helpers/isLeadingSurrogate'); var isTrailingSurrogate = require('../helpers/isTrailingSurrogate'); // https://262.ecma-international.org/11.0/#sec-utf16decodesurrogatepair module.exports = function UTF16DecodeSurrogatePair(lead, trail) { if (!isLeadingSurrogate(lead) || !isTrailingSurrogate(trail)) { throw new $TypeError('Assertion failed: `lead` must be a leading surrogate char code, and `trail` must be a trailing surrogate char code'); } // var cp = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000; return $fromCharCode(lead) + $fromCharCode(trail); };
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