const fetch = require('node-fetch')
const run = require('run-gen')
 
const downloadsUrl = `https://api.npmjs.org/downloads/point`
const registryUrl = `https://registry.npmjs.org`
 
function* downloads(pkg, period) {
    const res = yield fetch(`${downloadsUrl}/${period}/${pkg}`)
    const stats = JSON.parse(yield res.text())
    return (stats && stats.downloads) || 'unknown'
}
 
function* info(pkg) {
    const res = yield fetch(`${registryUrl}/${pkg}`)
    const info = JSON.parse(yield res.text())
    return {
        name: info.name,
        description: info.description,
    }
}
 
function* stats(pkg, period = 'last-month') {
    return Object.assign(
        {},
        yield* info(pkg),
        {downloads: yield* downloads(pkg, period)}
    )
}
 
run(stats('npm')).then(r => console.log(r), e => console.log(e))