'use strict'

const del = require('del')

const rollup = require('rollup')

const babel = require('rollup-plugin-babel')

const pkg = require('../package.json')

let promise = Promise.resolve()

const dependencies = Object.assign({}, pkg.dependencies || {}, pkg.peerDependencies || {})

// Clean up the output directory

promise = promise.then(() => del(['dist/*']))

const outputName = pkg.name

const formats = ['es']

// Compile source code into a distributable format with Babel

formats.forEach((format) => {

promise = promise.then(() => rollup.rollup({

input: 'src/index.js',

external: Object.keys(dependencies),

plugins: [babel({

exclude: 'node_modules/**'

})]

}).then(bundle => bundle.write({

file: `dist/${outputName}.js`,

format,

sourcemap: true

})))

})

promise.catch(err => {

console.error(err.stack) // eslint-disable-line no-console

process.exit(1)

})