1 files changed, 19 insertions, 0 deletions
diff --git a/node_modules/es-abstract/2018/thisSymbolValue.js b/node_modules/es-abstract/2018/thisSymbolValue.js
new file mode 100644
index 000000000..3c3b3475d
--- /dev/null
+++ b/node_modules/es-abstract/2018/thisSymbolValue.js
@@ -0,0 +1,19 @@
+'use strict';
+
+var callBound = require('../helpers/callBound');
+
+var $SymbolValueOf = callBound('Symbol.prototype.valueOf', true);
+
+var Type = require('./Type');
+
+// https://ecma-international.org/ecma-262/9.0/#sec-thissymbolvalue
+
+module.exports = function thisSymbolValue(value) {
+	if (!$SymbolValueOf) {
+		throw new SyntaxError('Symbols are not supported; thisSymbolValue requires that `value` be a Symbol or a Symbol object');
+	}
+	if (Type(value) === 'Symbol') {
+		return value;
+	}
+	return $SymbolValueOf(value);
+};