load local .env files with app.json as manifest

load-env.js

const path = require('path')
const fs = require('fs')
import attempt from 'lodash/attempt'

const app = require('./app.json')

const readDotEnv = filePath => attempt(
  fs.readFileSync(filePath, 'utf-8').split('\n').filter(Boolean)
)

// Patch process.env from .env
const lines = readDotEnv(path.resolve('./.env'))

lines.forEach((line, index) => {
  const matches = line.match(/^\s*([\w\.\-]+)\s*=\s*(.*)?\s*$/)

  if (!matches) {
    throw new Error(`Could not parse .env line #${index + 1}: ${line}`)
  }

  const key = matches[1]
  const value = matches[2]
  const missing = typeof process.env[key] === 'undefined'

  if (missing) {
    process.env[key] = value
  }
})

// Patch process.env from app.json
Object.keys(app.env).forEach(key => {
  const required = app.env[key].required
  const value = app.env[key].value
  const missing = required && typeof process.env[key] === 'undefined'

  if (missing) {
    if (value) {
      process.env[key] = value
    } else {
      console.warn(`Warning: process.env.${key} is missing.`) // eslint-disable-line
    }
  }
})