bajo/boot/lib/parse-env.js

A framework to build a giant monstrous app rapidly

import dotenvParseVariables from 'dotenv-parse-variables'
import { unflatten } from 'flat'
import dotEnv from 'dotenv'
import lodash from 'lodash'

const { each, set, camelCase, forOwn } = lodash

const parse = (data, delimiter) => {
  return unflatten(data, {
    delimiter,
    safe: true,
    overwrite: true,
    transformKey: k => {
      return camelCase(k.toLowerCase())
    }
  })
}

export default function ({ delimiter = '__', splitter = '.' } = {}) {
  let env
  try {
    env = dotEnv.config()
    if (env.error) throw env.error
  } catch (err) {
    env = { parsed: {} }
  }
  env = dotenvParseVariables(env.parsed, { assignToProcessEnv: false })
  const all = { _: {} }
  each(env, (v, k) => {
    const parts = k.split(splitter)
    if (!parts[1]) all._[parts[0]] = v
    else set(all, `${camelCase(parts[0])}.${parts[1]}`, v)
  })
  const result = {}
  forOwn(all, (v, k) => {
    result[k] = parse(v, delimiter)
  })
  return result
}