ts-copyable

Type-safe .copy() for TypeScript inspired by Scala case-class

How to install

$ npm install --save ts-copyable

How to use

Before

class Person{
    constructor(readonly name: string, readonly age: number){

    }
}

After

import { Copyable } from 'ts-copyable';

class Person extends Copyable<Person>{
    constructor(readonly name: string, readonly age: number){
        super(Person);
    }
}

Then your Person class is copyable!

const p1 = new Person("jack", 10);

p1.copy({age: 2});
// => Person("jack", 2)

p1.mapCopy({age: prev => prev+1});
// => Person("jack", 11)

How about type-safety?

const p1 = new Person("jack", 10);

p1.copy({age: "abc"});
// Compile error (GOOD!)

p1.copy({somethingElse: 99});
// Compile error (GOOD!)

p1.mapCopy({age: prev => prev+"abc"});
// Compile error (GOOD!)