Example using Promise.race to timeout if a service lookup takes too long i.e. service not ready maybe due to dependent services

promise-race-sample

const lookupService = (name, timeoutService = 100) => {
    if (!_services[name]) return Promise.reject(`Unknown service <${name}>`)
    let svc = _services[name]
    let timeout
    return Promise.race([
        svc.promise,
        new Promise((resolve, reject) => {
            timeout = global.setTimeout(() => {
                reject(new Error(`Time out looking up service <${name}>`))
            }, timeoutService)
        })
    ]).then(svc => {
        global.clearInterval(timeout)
        return svc
    }).catch(err => {
        throw err
    })
}