Error helper

[sindresorhus]

Most of my CLI's have this:

var cli = meow();

fn(function (err) {
    if (err) {
        console.error(err.message);
        process.exit(1);
    }
});

Wonder if we could abstract out the error handling.

Eg:

var cli = meow();

fn('unicorn', function (err) {
    cli.handleError(err);
});

It could potentially also handle showing the stack when --verbose is passed.

Thoughts?

// @kevva @floatdrop @arthurvr @shinnn

[arthurvr]

Yes please! 👍

[kevva]

Yeah, sure, that'd be useful I think. I'm using the same pattern everywhere in my CLIs too.

[sindresorhus]

How about the verbose thing?

[gillstrom]

How do we change the process.exit code for errors?

[sindresorhus]

Maybe cli.exitCode = 3; and it will use that instead?

Could also be a second argument to cli.handleError(err, exitCode);, but then you wouldn't be able to:

fn('unicorn', cli.handleError(err));

[kevva]

Hmm, why wouldn't that work?

[sindresorhus]

Oops, should have been:

fn('unicorn', cli.handleError);

Might not be a problem though. Since you can just wrap it in a function, and arrow functions will make that nicer.

[kevva]

Yeah, exactly, shouldn't be that big of a deal. Better future compatibility too if we wanted to add even more stuff.

[LinusU]

err.exitCode? That's what express is doing

var err = new Error('Output file exists')
err.exitCode = 9
err.code = 'EEXISTS'
cli.handleError(err)

[sindresorhus]

Skipping this as we now handle promise errors automagically and I'm not going to continue using callback-style interface.