Commit

1 files changed, 26 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2018/UnicodeEscape.js b/src/node_modules/es-abstract/2018/UnicodeEscape.js
new file mode 100644
index 0000000..aeca437
--- /dev/null
+++ b/src/node_modules/es-abstract/2018/UnicodeEscape.js
@@ -0,0 +1,26 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var callBound = require('../helpers/callBound');
+
+var $charCodeAt = callBound('String.prototype.charCodeAt');
+var $numberToString = callBound('Number.prototype.toString');
+var $toLowerCase = callBound('String.prototype.toLowerCase');
+var $strSlice = callBound('String.prototype.slice');
+
+// https://tc39.es/ecma262/2020/#sec-unicodeescape
+
+module.exports = function UnicodeEscape(C) {
+	if (typeof C !== 'string' || C.length !== 1) {
+		throw new $TypeError('Assertion failed: `C` must be a single code unit');
+	}
+	var n = $charCodeAt(C, 0);
+	if (n > 0xFFFF) {
+		throw new $TypeError('`Assertion failed: numeric value of `C` must be <= 0xFFFF');
+	}
+
+	return '\\u' + $strSlice('0000' + $toLowerCase($numberToString(n, 16)), -4);
+};