Package Exports

to-aop

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Readme

to-aop

The to-aop module help you with applying Aspect Oriented Programming to JavaScript. It use under the hood ES Proxy for object same as other similar modules. It allow you hook class without creating new instance as well. It use javascript prototype for that.

Installation

npm i to-aop --save

Usage

You have some common class. For example:

// a.js
export default class A {
  constructor(variable) {
    this.variable = variable;
  }

  method() {
    return this.variable;
  }

  notHookedMethod() {
    return 'not hook';
  }    
}

Applying AOP to class

import { aop, hookName, createHook } from 'to-aop';
import A from './a';

const classHook = createHook(
  hookName.afterMethod,
  /^(method)$/,
  ({ target, object, property, context, args, payload }) => {
    console.log(
      `Instance of ${target.name} call "${property}"
with arguments ${args && args.length ? args : '[]'}
and return value is "${payload}".`
    );
  }
);

aop(A, classHook); // bind hook to class
const a = new A('my hook');

a.method(); // Instance of A call "method" with arguments [] and return value is "my hook".
a.notHookedClassMethod(); // not hook

Applying AOP to instance or object

import { aop, hookName, createHook } from 'to-aop';
import A from './a';

const instanceHook = createHook(
  hookName.afterMethod,
  /^(method)$/,
  ({ target, object, property, context, args, payload }) => {
    console.log(
      `Instance of ${object.constructor.name} call "${property}"
with arguments ${args && args.length ? args : '[]'}
and return value is "${payload}".`
    );
  }
);

const a = new A('my hook');
const hookedInstance = aop(a, instanceHook); // bind hook to instance

hookedInstance.method(); // "Instance of A call "method" with arguments [] and return value is "my hook".
hookedInstance.notHookedClassMethod(); // not hook

Hooks API

We implemented base set of hooks which you can use for AOP.

beforeMethod
afterMethod
aroundMethod
beforeGetter
afterGetter
aroundGetter
beforeSetter
afterSetter
aroundSetter