CLI email prompt featuring autocompletion and validation. Powers vercel --login.

import emailPrompt from 'email-prompt';

let email;

try {
  email = await emailPrompt({
    /* options */
  });
} catch (err) {
  console.log('\n> Aborted!');
  return;
}

console.log('\n> Hello ' + email);

To run the demo, clone the project and run:

npm install
node demo

• start (String): the beginning of the prompt. Defaults to > Enter your email:
• domains (Set): domain names to autocomplete (as String). Defaults to:
  • aol.com
  • gmail.com
  • google.com
  • yahoo.com
  • ymail.com
  • hotmail.com
  • live.com
  • outlook.com
  • inbox.com
  • mail.com
  • gmx.com
  • icloud.com
  • hey.com
  • zeit.co
  • vercel.com
• forceLowerCase (Boolean): converts all input to lowercase. Defaults to true.
• suggestionColor (String): a chalk color. Defaults to gray
• autocompleteChars (Set): a set of chars that trigger autocompletion. Defaults to:
  • ↹ Tab
  • ↵ Return (enter)
  • → Right arrow
• resolveChars (Set): a set of chars that resolve the promise. Defaults to ↵return
• abortChars (Set): a set of chars that abort the process. Defaults to Ctrl+C
• allowInvalidChars (Boolean): controls whether non-email chars are accepted. Defaults to false

Some important implementation details:

• email-prompt automatically adapts the mode of process.stdin for you.
• The stdin stream is resumed and paused upon the promise being settled.
• When the promise resolves or rejects, the previous stdin mode is restored.
• The tty mode is set to raw, which means all the caret interactions that you come to expect in a regular stdin prompt are simulated. This gives us fine-grained control over the output and powers the validation.

• Guillermo Rauch (@rauchg) - Vercel
• Leo Lamprecht (@notquiteleo) - Vercel