js deferred using promise

deferred.js

class Deferred {
    constructor() {
        this.promise = new Promise((resolve, reject) => {
          this.resolve = resolve
          this.reject = reject
        })
        
        this.then = this.promise.then.bind(this.promise)
        this.catch = this.promise.catch.bind(this.promise)
    }
}

export function deferred() {
    return new Deferred()
}

// await timeout(100)
export function timeout(duration = 0) {
    return new Promise(resolve => {
        setTimeout(resolve, duration)
    })
}