A nodejs library for issuing and handling responses to yes/no questions

Supports Node 8+.

Installation

1npm install yesno

Usage

1import yesno from 'yesno';        // modern es modules approach
2
3// *OR*
4
5const yesno = require('yesno');   // commonjs approach

Examples

basic

1const ok = await yesno({
2    question: 'Are you sure you want to continue?'
3});

yesno accepts yes, y , no, and n values by default.

All yesno responses are case insensitive.

Custom Yes/No values

1const ok = await yesno({
2    question: 'Dude, Is this groovy or what?',
3    yesValues: [ 'groovy' ],
4    noValues: [ 'or what', 'nah' ]
5});
6
7console.log(ok ? 'Tubular.' : 'Aw, why you gotta be like that?');

Now the question only responds to groovy as yes and or what as no.

No default value

Sometimes you may want to ensure the user didn't accidentally accept a default. You can disable the default response by passing null as the defaultValue parameter.

1const ok = await yesno({
2    question: 'Are you sure you want to 'rm-rf /' ?',
3    defaultValue: null
4});

Handling invalid responses

By default, if the user enters a value that isn't recognized as an acceptable response, it will print out a message like:

Invalid response.
Answer either yes : (yes, y)
Or no : (no, n)

and re-ask the question. If you want to change this behavior, you can set the invalid handler before asking your question:

1const ok = await yesno({
2    question: 'Ready to continue?',
3    invalid: function ({ question, defaultValue, yesValues, noValues }) {
4        process.stdout.write("\n Whoa. That was not a good answer. Well. No more tries for you.");
5        process.exit(1);
6    }
7});