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File Content: `polyfill.js`

// ES2015 Symbol polyfill for environments that do not (or partially) support it

"use strict";

var d                    = require("d")
  , validateSymbol       = require("./validate-symbol")
  , NativeSymbol         = require("ext/global-this").Symbol
  , generateName         = require("./lib/private/generate-name")
  , setupStandardSymbols = require("./lib/private/setup/standard-symbols")
  , setupSymbolRegistry  = require("./lib/private/setup/symbol-registry");

var create = Object.create
  , defineProperties = Object.defineProperties
  , defineProperty = Object.defineProperty;

var SymbolPolyfill, HiddenSymbol, isNativeSafe;

if (typeof NativeSymbol === "function") {
	try {
		String(NativeSymbol());
		isNativeSafe = true;
	} catch (ignore) {}
} else {
	NativeSymbol = null;
}

// Internal constructor (not one exposed) for creating Symbol instances.
// This one is used to ensure that `someSymbol instanceof Symbol` always return false
HiddenSymbol = function Symbol(description) {
	if (this instanceof HiddenSymbol) throw new TypeError("Symbol is not a constructor");
	return SymbolPolyfill(description);
};

// Exposed `Symbol` constructor
// (returns instances of HiddenSymbol)
module.exports = SymbolPolyfill = function Symbol(description) {
	var symbol;
	if (this instanceof Symbol) throw new TypeError("Symbol is not a constructor");
	if (isNativeSafe) return NativeSymbol(description);
	symbol = create(HiddenSymbol.prototype);
	description = description === undefined ? "" : String(description);
	return defineProperties(symbol, {
		__description__: d("", description),
		__name__: d("", generateName(description))
	});
};

setupStandardSymbols(SymbolPolyfill);
setupSymbolRegistry(SymbolPolyfill);

// Internal tweaks for real symbol producer
defineProperties(HiddenSymbol.prototype, {
	constructor: d(SymbolPolyfill),
	toString: d("", function () { return this.__name__; })
});

// Proper implementation of methods exposed on Symbol.prototype
// They won't be accessible on produced symbol instances as they derive from HiddenSymbol.prototype
defineProperties(SymbolPolyfill.prototype, {
	toString: d(function () { return "Symbol (" + validateSymbol(this).__description__ + ")"; }),
	valueOf: d(function () { return validateSymbol(this); })
});
defineProperty(
	SymbolPolyfill.prototype,
	SymbolPolyfill.toPrimitive,
	d("", function () {
		var symbol = validateSymbol(this);
		if (typeof symbol === "symbol") return symbol;
		return symbol.toString();
	})
);
defineProperty(SymbolPolyfill.prototype, SymbolPolyfill.toStringTag, d("c", "Symbol"));

// Proper implementaton of toPrimitive and toStringTag for returned symbol instances
defineProperty(
	HiddenSymbol.prototype, SymbolPolyfill.toStringTag,
	d("c", SymbolPolyfill.prototype[SymbolPolyfill.toStringTag])
);

// Note: It's important to define `toPrimitive` as last one, as some implementations
// implement `toPrimitive` natively without implementing `toStringTag` (or other specified symbols)
// And that may invoke error in definition flow:
// See: https://github.com/medikoo/es6-symbol/issues/13#issuecomment-164146149
defineProperty(
	HiddenSymbol.prototype, SymbolPolyfill.toPrimitive,
	d("c", SymbolPolyfill.prototype[SymbolPolyfill.toPrimitive])
);

Name	Size	Permission
.github	---	0755
lib	---	0755
test	---	0755
.editorconfig	288 bytes	0755
.testignore	13 bytes	0644
CHANGELOG.md	775 bytes	0644
CHANGES	1937 bytes	0644
LICENSE	773 bytes	0644
README.md	3321 bytes	0644
implement.js	215 bytes	0644
index.js	125 bytes	0644
is-implemented.js	548 bytes	0644
is-native-implemented.js	215 bytes	0644
is-symbol.js	280 bytes	0644
package.json	3378 bytes	0644
polyfill.js	3240 bytes	0644
validate-symbol.js	181 bytes	0644

Command Bosku:

File Content: polyfill.js

File Content: `polyfill.js`