default on arrays do not behave as expected

[kaizencc]

Given the following option on a command:

.option('my-option', {
          type: 'array',
          desc: "my-desc",
        })

When my-option is not provided via the arguments, command['my-option'] is undefined, as expected.

But when I specify the option this way:

.option('my-option', {
          default: undefined,
          type: 'array',
          desc: "my-desc",
        })

I expect the default value for my-option to be undefined. However I see that the default value becomes [undefined]. This feels out of the ordinary and causes downstream issues when I try to ensure that my-option is undefined.

I would like yargs to respect my provided default and not throw it into an array.

[shadowspawn]

I see what you were expecting, but this is at least consistent with how other values are handled for an array.

import yargsFactory from 'yargs/yargs';

const yargs = yargsFactory()
    .option('a', { type: 'array' })
    .option('s', { type: 'array' , default: 'SSS' })
    .option('n', { type: 'array', default: 123 })
    .option('b', { type: 'array', default: true })
    .option('u', { type: 'array', default: undefined });

console.log(yargs.parse());

$ node index.mjs 
{
  _: [],
  s: [ 'SSS' ],
  n: [ 123 ],
  b: [ true ],
  u: [ undefined ],
  '$0': 'index.mjs'
}