abstract-env

This in companion of parcel-plugin-real-env. It just wraps global env variable for safty using configuration.

TL;DR

yarn add @samokat/abstarct-env

// config.js

import { createConfig } from '@samokat/abstarct-env'

const config = createConfig({
  API_URL: 'fallback-for-empty-var',
})

const apiUrl = config('API_URL')

Details

Library provides two way for creating configuration: createConfig (throws Error for empty value) and createOptionalConfig (returns Option for every value).

Both creators accept fallback values as first agrument and optional name of global config store (default is _env_) as second.

Example with simple creator:

// config.js

import { createConfig } from '@samokat/abstarct-env'

const config = createConfig({
  API_URL: 'fallback-for-empty-var',
}, '_custom_variable_in_global_scope_')

const apiUrl = config('API_URL') // 'fallback-for-empty-var'

Example with optional creator:

// config.js

import { createOptionalConfig } from '@samokat/abstarct-env'

const config = createOptionalConfig({}, '_custom_variable_in_global_scope_')

const apiUrl = config('API_URL') // Option<string>
apiUrl.isEmpty() // true

Common usage

In common project we use Parcel as bundler, and it can pass env variables to application in dev mode.

// config.js

import { createConfig } from '@samokat/abstarct-env'

const config = createConfig({
  // In dev mode we accept current env variable
  // In prod mode it will be empty
  // and we accept value from global store, injected by external forces
  API_URL: process.env.API_URL,
})

const apiUrl = config('API_URL')