Compositer

by @angrykoala

Compositer is an utility to generate composed ES6 classes dynamically.

npm install --save compositer

const compose=require('compositer');
 
class Child{
    constructor(parent){
        this._value=parent.value*10;
    }
 
    get value(){
        return this._value;
    }
}
 
 
class Parent{
    constructor(value){
        this.value=value;
    }
}
 
// Components define the composite names for the instances of the child classes
const components = {
    "myChild": Child
};
 
// compose returns a new class containing the parent class and the composed sub classes
const ComposedParent = compose(Parent,components);
// The constructor of the composed class will instance and attach the child classes to getters
const myComposite = new ComposedParent(100);
 
myComposite.value; // 100
myComposite.myChild.value; // 1000

Api

Composer exposes one function to generate composite classes:

compose(ParentClass, components, ...extraParams?)

• ParentClass is the class that will have the child attached to.
• components is an object with keys being the name to use for the instance and value the child class. Same child class can be used multiple times.
  • If a plain function is used instead of a class, the function will be attached directly, the same arguments as the constructor will be used plus any argument passed to the function when called.
• extraParams allow you to add params to the child classes constructors.
• Returns a new class that will instance the child classes. The class will be named the same as the ParentClass with "Composite" at the end.
• ParentClass will receive an extra parameter with a list of all its components names, allowing it to access dynamically

Development Instructions

After cloning the repo:

1. npm install
2. npm test