private-name
v0.1.0
Published
Simple shim for ES.next Private Names
Downloads
11
Readme
name
A very simple ES.next shim. It works fairly well without any monkey-patching (though it does need to create one non-enumerable property on Object.prototype but it's much less intrusive than replacing functions. The variable name is random and uses unicode characters so the chances of conflicts are slim to none)
Installation
Install with component(1):
$ component install ilsken/name
Usage (with component or node.js)
var Name = require('name')
var myObject = {}
// you can also use new Name('something') to create a friendlier name for debugging tools which can see hidden properties
var hiddenProperty = new Name()
myObject[hiddenProperty] = 'foo'
console.log(myObject) // {}
console.log(myObject[hiddenProperty]) // "foo"
console.log(myObject.hasOwnProperty(hiddenProperty)) // false
console.log(Object.keys(myObject)) // []
## Usage (plain script tags)
```html
<script src="dist/name.js"></script>
<script>
var hiddenProperty = new Name()
// etc
Gotchas
While this shim for the most part works without any monkey-patching there are currently a couple ways to leak the private properties names. If you want to fix those leaks you can use the patches below
Object.propertyNames(object)
var props = Object.getOwnPropertyNames
function getOwnPropertyNames(obj){
return props(obj).filter(Name.isPublic)
}
Object.getOwnPropertyNames = getOwnPropertyNames
Object.hasOwnProperty(Object.prototype, hiddenProperty)
If you define hidden properties on Object.prototype the method we use to hide doesn't work. I don't know why you would define hidden properties on the prototype but just in case here's how you'd patch this leak
var has = Object.hasOwnProperty
function hasOwnProperty(obj, prop){
return Name.isPublic(prop) && has(obj, prop)
}
License
MIT