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const { EventEmitter } = require('events'); | ||
const { Func, noFunc } = require("./Internal"); | ||
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class Future extends EventEmitter { | ||
constructor(f = undefined) { | ||
if (typeof f === 'function') { | ||
f = new Func; | ||
Object.assign(f, EventEmitter.prototype); | ||
} else { | ||
super(); | ||
f = this; | ||
} | ||
f.o = null; | ||
f.resolve = f.addCall = noFunc; // Will be defined in trap method | ||
return f; | ||
} | ||
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await(promise) { | ||
(async _ => { | ||
this.resolve(await promise); | ||
})(); | ||
return this; | ||
} | ||
} | ||
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exports.Future = Future; |
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const { VALUE } = require('./Symbols'); | ||
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class Internal { | ||
constructor(value) { | ||
this[VALUE] = value; | ||
} | ||
} | ||
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class IfNotExist extends Internal { | ||
constructor(value, skip = false, valueWhenExists = undefined) { | ||
super(value); | ||
this.skip = Boolean(skip); | ||
if (skip && valueWhenExists) { | ||
this.resolve = valueWhenExists; | ||
} | ||
} | ||
} | ||
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class Both extends Internal { | ||
constructor(value, callback) { | ||
super(value); | ||
this.callback = callback; | ||
} | ||
} | ||
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class Func extends Function { | ||
} | ||
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const noFunc = function() {}; | ||
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const noObj = {}; | ||
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exports.Internal = Internal; | ||
exports.IfNotExist = IfNotExist; | ||
exports.Both = Both; | ||
exports.Func = Func; | ||
exports.noFunc = noFunc; | ||
exports.noObj = noObj; |
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<h1 align="center">Welcome to future-proxy 👋</h1> | ||
<p> | ||
<img alt="Version" src="https://img.shields.io/badge/version-1.0.0-blue.svg?cacheSeconds=2592000" /> | ||
<a href="#" target="_blank"> | ||
<img alt="License: ISC" src="https://img.shields.io/badge/License-ISC-yellow.svg" /> | ||
</a> | ||
</p> | ||
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> A proxy which wraps a potential "future" object, that does not exist Yet! | ||
### 🏠 [Homepage](https://github.com/prkeshri/node-future-proxy) | ||
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## Install | ||
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```sh | ||
npm install future-proxy | ||
``` | ||
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> A JS Proxy wraps an object where we can intercept (and do whatever we wish with the object!). But what if the object does not exist yet? One example being a mock http request (I am working on this ;)). So, here it goes. Here are a few examples that will illustrate the usage: | ||
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<u>Warning:</u> Only limitation is: By default, 'get' trap outputs a function. If you wish anything else, you will have to provide in interceptors! | ||
<br/> | ||
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<b>Minimal Setup:</b> | ||
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const proxy = require('./proxy'); | ||
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const t = new proxy.Future(); // Create a reference to some future object. | ||
const x = proxy.trap(t); | ||
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// Do whatever you would do as if the object 't' actually exists | ||
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// Later after sometime... | ||
t.resolve(futureObject); // Now, all the calls (get, set, etc.) to 'futureObject' will be made. | ||
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If you wish to trap a function, instead of new proxy.Future, call: | ||
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new proxy.Future(proxy.Function); | ||
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The documentation is a progress to include the other (advanced) features. Meanwhile, files inside test/ can be referenced. | ||
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## API | ||
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### trap | ||
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This function outputs the Proxy. | ||
The actual methods are called when the target is set to proper value by | ||
calling target.resolve(value); | ||
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##### Parameters | ||
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* `target` **Future** : o : Must be an instance of Future. | ||
* `interceptors` **any?** : An interceptor object (Optional) See [below](interceptors). | ||
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##### Returns ` | ||
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`Proxy` : This records all the calls and calls them later when the target is resolved! | ||
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[interceptors]: #interceptors | ||
#### An interceptor can be either of the following: | ||
1. ` function(trapKey, arguments)` Here, trapKey is any of the proxy handler key i.e. get, set, etc. | ||
arguments is the arguments to the handler trap. | ||
2. `{ | ||
... same key value pairs as Proxy Handler. | ||
See [https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Proxy] | ||
}` | ||
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##### Interceptor return values and actions: | ||
1. If no value returned, same call will be made when the target is resolved. | ||
2. If any value other than the below, are returned, same call will be made when the target is resolved.2.a. | ||
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<... More and advanced usage documentation in progress ... > | ||
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## Run tests | ||
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```sh | ||
npm run test | ||
``` | ||
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## Author | ||
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👤 **Praveen Ranjan Keshri** | ||
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* Github: [@prkeshri](https://github.com/prkeshri) | ||
* LinkedIn: [@prkeshri](https://linkedin.com/in/prkeshri) | ||
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## Show your support | ||
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Give a ⭐️ if this project helped you! | ||
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*** | ||
_This README was generated with ❤️ by [readme-md-generator](https://github.com/kefranabg/readme-md-generator)_ |
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const VALUE = Symbol("VALUE"), | ||
FUNCTION = Symbol("FUNCTION"), | ||
__call = Symbol("__call"), | ||
TRAP = Symbol("TRAP"), | ||
__resolve = Symbol("__resolve"), | ||
IF_NOT_EXIST = Symbol("IF_NOT_EXIST"), | ||
RESOLVE = Symbol("RESOLVE"), | ||
BOTH = Symbol("BOTH"); | ||
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exports.VALUE = VALUE; | ||
exports.FUNCTION = FUNCTION; | ||
exports.__call = __call; | ||
exports.TRAP = TRAP; | ||
exports.__resolve = __resolve; | ||
exports.IF_NOT_EXIST = IF_NOT_EXIST; | ||
exports.RESOLVE = RESOLVE; | ||
exports.BOTH = BOTH; |
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const { FUNCTION } = require('./Symbols'); | ||
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const defaultValueMap = { | ||
"apply": undefined, | ||
"construct": {}, | ||
"defineProperty": true, | ||
"deleteProperty": true, | ||
"get": FUNCTION, | ||
"getOwnPropertyDescriptor": undefined, | ||
"getPrototypeOf": {}, | ||
"has": false, | ||
"isExtensible": false, | ||
"ownKeys": {}, | ||
"preventExtensions": false, | ||
"set": true, | ||
"setPrototypeOf": true, | ||
}; | ||
const overrideDefaultValueMap = function (newValueMap) { | ||
return Object.assign(overrideDefaultValueMap, newValueMap); | ||
}; | ||
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exports.defaultValueMap = defaultValueMap; | ||
exports.overrideDefaultValueMap = overrideDefaultValueMap; |
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{ | ||
"name": "future-proxy", | ||
"version": "1.0.0", | ||
"description": "A proxy which wraps a potential \"future\" object, which does not exist Yet!", | ||
"main": "proxy.js", | ||
"scripts": { | ||
"test": "node ./test/proxy.test" | ||
}, | ||
"keywords": [ | ||
"proxy", | ||
"future", | ||
"wrap" | ||
], | ||
"author": "Praveen Ranjan Keshri", | ||
"license": "ISC", | ||
"directories": { | ||
"test": "test" | ||
}, | ||
"repository": { | ||
"type": "git", | ||
"url": "git+https://github.com/prkeshri/node-future-proxy.git" | ||
}, | ||
"bugs": { | ||
"url": "https://github.com/prkeshri/node-future-proxy/issues" | ||
}, | ||
"homepage": "https://github.com/prkeshri/node-future-proxy#readme" | ||
} |
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