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clarify es5 and add getters/setters in IE 8<= to caveats fixes #314

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Sebastian McKenzie 2014-12-19 01:11:48 +11:00
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doc/caveats.md
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@ -2,7 +2,9 @@
In order for certain features to work they require certain polyfills. You can In order for certain features to work they require certain polyfills. You can
satisfy **all** 6to5 feature requirements by using the included satisfy **all** 6to5 feature requirements by using the included
[polyfill](polyfill.md). You may alternatively selectively include what you need: [polyfill](polyfill.md).
You may alternatively selectively include what you need:
| Feature | Requirements | | Feature | Requirements |
| --------------------------- | ---------------------------------------------------------------------------------------------------------------------- | | --------------------------- | ---------------------------------------------------------------------------------------------------------------------- |
@ -14,10 +16,17 @@ satisfy **all** 6to5 feature requirements by using the included
| Object spread/rest | [experimental](experimental.md), `Object.assign` | | Object spread/rest | [experimental](experimental.md), `Object.assign` |
| Spread | `Array.isArray`, `Array.from` | | Spread | `Array.isArray`, `Array.from` |
## Classes ## ES5
Built-in classes such as `Date`, `Array` and `DOM` cannot be subclassed due to Since 6to5 assumes that your code will be ran in an ES5 environment it uses ES5
limitations in ES5 implementations. functions. So if you're using an environment that has limited or no support for
ES5 such as lower versions of IE then using the
[es5-shim](https://github.com/es-shims/es5-shim) along with the
[6to5 polyfill](polyfill.md) will add support for these methods.
## Internet Explorer
### Classes (9 and below)
If you're inheriting from a class then static properties are inherited from it If you're inheriting from a class then static properties are inherited from it
via [\_\_proto\_\_](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto), via [\_\_proto\_\_](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto),
@ -40,9 +49,11 @@ class Bar extends Foo {
} }
``` ```
## 6to5-node ## Getters/setters (8 and below)
It is necessary to manually install `kexec` package on Unix-like OSes for In IE8 `Object.defineProperty` can only be used on DOM objects. This is
`6to5-node` to correctly handle signals. unfortunate as it's required to set getters and setters. Due to this if
you plan on supporting IE8 or below then the user of getters and setters
isn't recommended.
**It is not recommended to use `6to5-node` with a process manager (`supervisord`, `upstart`, `systemd`, ...) without first installing `kexec`!** Reference: [MDN](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty#Internet_Explorer_8_specific_notes).