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has-flag

Check if argv has a specific flag


Version published
Maintainers
1
Weekly downloads
201,073,845
decreased by-17.58%
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5.20 kB

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Package description

What is has-flag?

The has-flag npm package is a simple utility that checks if a specific flag is provided in the command line arguments (process.argv). It is commonly used to determine if a flag is set when running a Node.js script from the terminal.

What are has-flag's main functionalities?

Check for the presence of a command line flag

This feature allows you to check if a flag, such as '--unicorn', is passed to the script. The code sample demonstrates how to use has-flag to check for the 'unicorn' flag and log a message if it is present.

const hasFlag = require('has-flag');

if (hasFlag('unicorn')) {
    console.log('We have a unicorn!');
}

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Source

has-flag

Check if argv has a specific flag

Install

$ npm install has-flag

Usage

// foo.js
import hasFlag from 'has-flag';

hasFlag('unicorn');
//=> true

hasFlag('--unicorn');
//=> true

hasFlag('f');
//=> true

hasFlag('-f');
//=> true

hasFlag('foo=bar');
//=> true

hasFlag('foo');
//=> false

hasFlag('rainbow');
//=> false
$ node foo.js -f --unicorn --foo=bar -- --rainbow

API

hasFlag(flag, argv?)

Returns a boolean for whether the flag exists.

It correctly stops looking after an -- argument terminator.

flag

Type: string

CLI flag to look for. The -- prefix is optional.

argv

Type: string[]
Default: process.argv

CLI arguments.


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Last updated on 19 Jul 2021

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