Note that ES6 proxies as specified permits
Object.defineProperty/getOwnPropertyDescriptor to pass custom attributes in
property descriptors and even passes them along (not sure if anybody has
actually implemented this yet) wherever there is a internal get descriptor/set
descriptor sequence. Proxies that support custom attributes might be an
interest way toi experiment with some of these ideas.
Allen
On Mar 8, 2014, at 10:45 AM, Andrea Giammarchi wrote:
> Yesterday, after my DHTMLConf talk, some developer asked me to
> present/propose my idea about introducing **optional** types in an ES5
> compatible way.
>
> Here a quick overview of properties which aim is to guard types or methods
> signatures, compatible with overloads for both number of arguments, and
> acepted type per each argument and each "guarding group".
>
> ```
> propertyName: {
> // ES5
> writable: true/false
> enumerable: true/false
> configurable: true/false
> get: Function
> set: Function
> value: any
>
> // my complementary, non obtrusive, info
> type: string(as typeof obj)|
> Function(as instanceof)|
> Object(as isPrototypeOf)
> returns: type|[type1, type2, typeN]
> arguments: [type]|[[type], [type]]
> }
>
> ```
>
> The return type can be different too, but I didn't forget to include the
> special type 'any' as white flag.
>
> All types and what they mean are [better described
> here](https://github.com/WebReflection/define-strict-properties#types).
>
> The most handy use case is probably `Object.defineProperties(Class.prototype,
> typedDescriptrs)` since each instance will be automatically guarded
> inheriting the guarded behavior.
>
> As mentioned in [this project
> goals](https://github.com/WebReflection/define-strict-properties#objectcreateproto-typedproperties),
> an ideal/dream goal would be having tools capable of
> documenting/understanding typed properties such IDE or even "transpilers" and
> in a parallel universe JS engines capable to natively use such info per each
> descriptor when available and both speed up properties get/set operations
> guarding natively the specific type.
>
> As example, this system made possible to implement a [StructType
> shim](https://github.com/WebReflection/define-strict-properties/blob/master/src/StructType.js#L57)
> in few lines of code.
>
> I don't expect this to be discussed soon but I wanted to point at this
> library now that is just officially born, despite I've proposed something
> similar in my blog already in 2010, so that if there's any big
> gotcha/mistake/nonsense in it I am in time to fix/improve or change.
>
> Thanks for your patience reading till the end and for any thoughts or hints
> that might come out.
>
> Best Regards and happy JS Fest!
>
>
>
>
>
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