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21 lines
823 B
21 lines
823 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $TypeError = GetIntrinsic('%TypeError%'); |
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var $fromCharCode = GetIntrinsic('%String.fromCharCode%'); |
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// https://262.ecma-international.org/7.0/#sec-utf16decode |
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var isLeadingSurrogate = require('../helpers/isLeadingSurrogate'); |
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var isTrailingSurrogate = require('../helpers/isTrailingSurrogate'); |
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// https://262.ecma-international.org/11.0/#sec-utf16decodesurrogatepair |
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module.exports = function UTF16Decode(lead, trail) { |
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if (!isLeadingSurrogate(lead) || !isTrailingSurrogate(trail)) { |
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throw new $TypeError('Assertion failed: `lead` must be a leading surrogate char code, and `trail` must be a trailing surrogate char code'); |
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} |
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// var cp = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000; |
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return $fromCharCode(lead) + $fromCharCode(trail); |
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};
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