1 files changed, 41 insertions, 0 deletions
diff --git a/src/node_modules/es-abstract/helpers/getSymbolDescription.js b/src/node_modules/es-abstract/helpers/getSymbolDescription.js
new file mode 100644
index 0000000..45d80d2
--- /dev/null
+++ b/src/node_modules/es-abstract/helpers/getSymbolDescription.js
@@ -0,0 +1,41 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var callBound = require('./callBound');
+
+var $SyntaxError = GetIntrinsic('%SyntaxError%');
+var getGlobalSymbolDescription = GetIntrinsic('%Symbol.keyFor%', true);
+var thisSymbolValue = callBound('%Symbol.prototype.valueOf%', true);
+var symToStr = callBound('Symbol.prototype.toString', true);
+
+var getInferredName = require('./getInferredName');
+
+/* eslint-disable consistent-return */
+module.exports = callBound('%Symbol.prototype.description%', true) || function getSymbolDescription(symbol) {
+	if (!thisSymbolValue) {
+		throw new $SyntaxError('Symbols are not supported in this environment');
+	}
+
+	// will throw if not a symbol primitive or wrapper object
+	var sym = thisSymbolValue(symbol);
+
+	if (getInferredName) {
+		var name = getInferredName(sym);
+		if (name === '') { return; }
+		return name.slice(1, -1); // name.slice('['.length, -']'.length);
+	}
+
+	var desc;
+	if (getGlobalSymbolDescription) {
+		desc = getGlobalSymbolDescription(sym);
+		if (typeof desc === 'string') {
+			return desc;
+		}
+	}
+
+	desc = symToStr(sym).slice(7, -1); // str.slice('Symbol('.length, -')'.length);
+	if (desc) {
+		return desc;
+	}
+};