depload

A tiny wrapper on top of dependency graph meant to load distinct services in the right order similarly to NestJS but without the heft of an entire opinionated framework.

import DependencyLoadContext from 'depload'
const dl = new DependencyLoadContext()

class Service1 {
    static deps = []
    static name = 's1'
    constructor()       { console.log('Started S1') }
    async destructor()  { console.log('Stopped S1') }
    async initializer() { }
}

class Service2 {

    static deps = ['s1'] // Deps listed by the names defined in their "Service.name" prop.
    static name = 's2'
    private declare s1: InstanceType<Service1>

    constructor({ s1 }) { // Deps injected directly by their defined names.
        this.s1 = s1
        console.log('Started S2') 
    }

    async destructor()  { console.log('Stopped S2') }
    async initializer() { }

}

dl.registerService(Service1)
dl.registerService(Service2)

dl.start()
// > Started S1
// > Started S2

dl.stop()
// > Stopped S2
// > Stopped S1