@47ng/check-env

Check that the critical environment variables are set for your app, and that you did not leave dangerous development overrides in production.

Installation

yarn add @47ng/check-env

Usage

import { checkEnv } from '@47ng/check-env'

checkEnv({
  // Will log an error and throw if any of these are missing:
  required: [
    'SOME_API_SECRET',
    'PRIVATE_TOKEN',
    'SOME_OTHER_IMPORTANT_THING'
    // ...
  ],

  // Will log an error and throw if any of these are set in production:
  unsafe: [
    'LOCAL_OVERRIDE_DISABLE_HTTPS',
    'INSECURE_COOKIES'
    // ...
  ]
})

If some required environment variable are not set, it will tell you and throw an error at the end:

Error handling

You can choose to skip throwing an error with the noThrow option:

checkEnv({
  noThrow: true,
  ...
})

Conditional Checks

If you want to require some variables only in production, you can add a condition before the variable name, any falsy value will be ignored:

const __PROD__ = process.env.NODE_ENV === 'production'

checkEnv({
  required: [
    'ALWAYS_REQUIRED',
    __PROD__ && 'ONLY_REQUIRED_IN_PRODUCTION',
    !__PROD__ && 'YOU_GET_THE_IDEA'
  ]
})

Logging

By default, check-env uses console.err with emoji.

You can override the default logging methods with logMissing and logUnsafe.

Example using Pino:

const logger = require('pino')()

checkEnv({
  logMissing: name => logger.error(`Missing required environment variable ${name}`),
  logUnsafe: name => logger.warn(`Unsafe environment variable ${name} set in production`),
  ...
})

License

MIT - Made with ❤️ by François Best

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