[#dotenv usage] with #import instead of require (as a #Node Module rather than a require of CommonJS package)

.env

API_KEY=api-key-123456789

error.mjs

class Client {
  constructor(apiKey) {
    this.apiKey = apiKey
  }

  report(err) {
    console.log(this.apiKey, err)
  }
}
export default new Client(process.env.API_KEY)

examples.md

follow these examples:

gh repo clone dotenv-org/examples

invalid.mjs

import dotenv from 'dotenv'
dotenv.config() // this will NOT load process.env before errorReporter is loaded.
// ES6 modules are not intuitive  like that. see valid.mjs for proper configuration

import errorReporter from './errorReporter.mjs'

errorReporter.report(new Error('documented example'))

usage.md

USAGE

An example of an ES6 import pitfall. See invalid.mjs and then valid.mjs.

Note how invalid.mjs does not correctly log the API_KEY environment variable.

See Below:

$ \
npm install &&\
node invalid.mjs &&\ 
node valid.mjs

valid.mjs

import 'dotenv/config'
import errorReporter from './errorReporter.mjs'

errorReporter.report(new Error('documented example'))