I use this to automatically fill in email addresses in feedback forms throughout workshop material

autofill-feedback-email.js

#!/usr/bin/env node

const path = require('path')
const inquirer = require('inquirer')
const replace = require('replace-in-file')
const isCI = require('is-ci')
const spawn = require('cross-spawn')

const fileGlob = process.argv[2] || 'src/**/*.*'
const files = path.isAbsolute(fileGlob)
  ? fileGlob
  : path.join(process.cwd(), fileGlob)

if (isCI) {
  console.log(`Not running autofill feedback as we're on CI`)
} else if (process.env.EMAIL) {
  const email = process.env.EMAIL
  console.log(`Autofilling email address to process.env.EMAIL: "${email}"`)
  replaceEmail(email)
} else {
  const tryAgain = `If you'd like to try again, run this command:\n\n    npx "https://gist.github.com/kentcdodds/2d44448a8997b9964b1be44cd294d1f5"\n`
  const prompt = inquirer.prompt([
    {
      name: 'email',
      message: `What's your email address?`,
      validate(val) {
        if (val && !val.includes('@')) {
          return 'email requires an @ sign...'
        }
        return true
      },
    },
  ])
  const timeoutId = setTimeout(() => {
    console.log(`\n\nPrompt timed out. No worries. ${tryAgain}`)
    prompt.ui.close()
  }, 60000)

  prompt.then(({email} = {}) => {
    clearTimeout(timeoutId)
    if (!email) {
      console.log(
        `Not autofilling email because none was provided. No worries. ${tryAgain}`,
      )
      return
    }
    replaceEmail(email)
  })
}

function replaceEmail(email) {
  const options = {
    files: [files],
    from: /&em=(?!.*@)/,
    to: `&em=${encodeURIComponent(email)}`,
  }

  replace(options)
    .then(results => {
      const changedFiles = results.filter(file => file.hasChanged)
      console.log(
        `Updated ${changedFiles.length} files with the email ${email}`,
      )
      if (changedFiles.length) {
        console.log(
          'Committing changes for you so your jest watch mode works nicely',
        )
        spawn.sync('git', ['commit', '-am', 'email autofill', '--no-verify'], {
          stdio: 'inherit',
        })
      }
    })
    .catch(error => {
      console.error('Failed to update files')
      console.error(error.stack)
    })
}

package.json

{
  "name": "autofill-feedback-email",
  "version": "1.0.0",
  "description": "I use this to automatically fill in email addresses in feedback forms throughout workshop material",
  "bin": "./autofill-feedback-email.js",
  "dependencies": {
    "inquirer": "7.0.4",
    "replace-in-file": "5.0.2",
    "is-ci": "2.0.0",
    "cross-spawn": "7.0.1"
  }
}

Based on this I think I'll go with EMAIL :)