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switch to core-js from es6-symbol and es6-shim

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This commit is contained in:
Sebastian McKenzie 2014-12-14 23:58:31 +11:00
parent 3dd6eb1202
commit 37b2e747d5
2 changed files with 13 additions and 51 deletions
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9
doc/polyfill.md
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@ -1,12 +1,11 @@
# Polyfill
6to5 includes a polyfill that includes the
[regenerator runtime](https://github.com/facebook/regenerator/blob/master/runtime.js) and the
[es6-shim](https://github.com/paulmillr/es6-shim) and
[es6-symbol](https://github.com/medikoo/es6-symbol) polyfills.
6to5 includes a polyfill that includes a custom
[regenerator runtime](https://github.com/facebook/regenerator/blob/master/runtime.js) and
[core.js](https://github.com/zloirock/core-js).
This will emulate a full ES6 environment. This polyfill is automatically loaded
when using [6to5-node](usage.md#node).
when using [6to5-node](usage.md#node) and [6to5/register](usage.md#register-hook).
## Usage

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lib/6to5/polyfill.js
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/* jshint newcap: false, freeze: false */
require("core-js/shim");
require("./transformation/transformers/es6-generators/runtime");
var ensureSymbol = function (key) {
Symbol[key] = Symbol[key] || Symbol(key);
};
var ensureProto = function (Constructor, key, val) {
var proto = Constructor.prototype;
if (!proto[key]) {
Object.defineProperty(proto, key, {
value: val
});
}
};
//
if (typeof Symbol === "undefined") {
require("es6-symbol/implement");
var globSymbols = {};
Symbol.for = function (key) {
return globSymbols[key] = globSymbols[key] || Symbol(key);
};
Symbol.keyFor = function (sym) {
return sym.__description__;
};
}
require("es6-shim");
require("./transformation/transformers/es6-generators/runtime");
ensureSymbol("species");
// Abstract references
ensureSymbol("referenceGet");
ensureSymbol("referenceSet");
ensureSymbol("referenceDelete");
ensureProto(Function, Symbol.referenceGet, function () { return this; });
ensureProto(Map, Symbol.referenceGet, Map.prototype.get);
ensureProto(Map, Symbol.referenceSet, Map.prototype.set);
ensureProto(Map, Symbol.referenceDelete, Map.prototype.delete);
if (global.WeakMap) {
ensureProto(WeakMap, Symbol.referenceGet, WeakMap.prototype.get);
ensureProto(WeakMap, Symbol.referenceSet, WeakMap.prototype.set);
ensureProto(WeakMap, Symbol.referenceDelete, WeakMap.prototype.delete);
}
ensureSymbol("hasInstance");
ensureSymbol("isConcatSpreadable");
ensureSymbol("isRegExp");
ensureSymbol("toPrimitive");
ensureSymbol("toStringTag");
ensureSymbol("unscopables");