chushihua

2026-01-26 23:20:48 +08:00
commit 7b5aab0206
22521 changed files with 3300090 additions and 0 deletions
@@ -0,0 +1,23 @@
+"use strict";
+
+var d              = require("d")
+  , validateSymbol = require("../../../validate-symbol");
+
+var registry = Object.create(null);
+
+module.exports = function (SymbolPolyfill) {
+	return Object.defineProperties(SymbolPolyfill, {
+		for: d(function (key) {
+			if (registry[key]) return registry[key];
+			return (registry[key] = SymbolPolyfill(String(key)));
+		}),
+		keyFor: d(function (symbol) {
+			var key;
+			validateSymbol(symbol);
+			for (key in registry) {
+				if (registry[key] === symbol) return key;
+			}
+			return undefined;
+		})
+	});
+};