Clean DIIoC

No decorators, no metadata
Clean Dependency Injection
even no changes in original code

• Everything is typed
• Context supported
• Tags supported

Example

We got interfaces

interface Warrior {
    fight(): string;
    sneak(): string;
}

interface Weapon {
    hit(): string;
}

interface ThrowableWeapon {
    throw(): string;
}

Append with

const di = new ContainerDI<{
    warrior: Warrior,
    weapon: Weapon,
    throwableWeapon: ThrowableWeapon
}>();

We got implementations

class Katana implements Weapon {
    public hit() {
        return "cut!";
    }
}

export class Shuriken implements ThrowableWeapon {
    public throw() {
        return "hit!";
    }
}

export class Ninja implements Warrior {
    private _katana: Weapon;
    private _shuriken: ThrowableWeapon;

    constructor(
        katana: Weapon,
        shuriken: ThrowableWeapon,
    ) {
        this._katana = katana;
        this._shuriken = shuriken;
    }

    public fight() { return this._katana.hit(); }
    public sneak() { return this._shuriken.throw(); }
}

Append with

di.setCtor('weapon', Katana);
di.setCtor('throwableWeapon', Shuriken);

di.set('warrior', () => new Ninja(
    di.pick('weapon'),
    di.pick('throwableWeapon')
));

Now use

const warrior = di.create('warrior');

console.log(warrior.sneak(), warrior.fight());

Singletone

// declare
interface ILogger {
    log(msg: string): void;
}

const di = new ContainerDI<{
    logger: ILogger,
}>();

// bind implementation
class Logger implements ILogger {
    log(msg: string): void {
        console.log(msg);
    }
}
di.set('logger', () => new Logger);

// use it as singletone

const logger = di.singletone('logger');
logger.log('hello');

const logger = di.singletone('logger');
logger.log('world');

OOP version

@morglod/di-ioc/lib/oop

• Decorators
• Everything is typed
• Context supported
• Tags supported

Example

Define interfaces

export interface Weapon {
    hit(): string;
}

export const Weapon = diBase<Weapon>();

Implementation

@diImpl(Weapon)
export class Katana {
    hit() {
        return 'cut!';
    }
}

Main

const weapon = diPick(Weapon);
weapon.hit() === 'cut!';

Example with tags

Implementation

@diImpl(Weapon)
export class Katana {
    hit() {
        return 'cut!';
    }
}

@diImpl(Weapon, 'mock')
export class FakeKatana {
    hit() {
        return 'fake cut!';
    }
}

Main

// Pick mock version
const fakeWeapon = diPick(Weapon, 'mock');

// Set fallback tag when no tag specified
diSetDefaultTag(Weapon, 'mock');
const fakeWeapon = diPick(Weapon);

// Everytime use tag=mock, even if other tag specified
diSetForceTag(Weapon, 'mock');
const fakeWeapon = diPick(Weapon, 'anyTag');