has-flag (4.0.0)

2026-02-24T13:57:34Z

Setup this registry in your project .npmrc file:

registry=

To install the package using npm, run the following command:

npm install has-flag@4.0.0

or add it to the package.json file:

"has-flag": "4.0.0"

For more information on the npm registry, see the documentation.

has-flag

Check if argv has a specific flag

Correctly stops looking after an -- argument terminator.

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Install

$ npm install has-flag

Usage

// foo.js
const hasFlag = require('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.

flag

Type: string

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

argv

Type: string[]
Default: process.argv

CLI arguments.

Security

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

License

MIT © Sindre Sorhus

Development Dependencies

ID	Version
ava	^1.4.1
tsd	^0.7.2
xo	^0.24.0

has check detect contains find flag cli command-line argv process arg args argument arguments getopt minimist optimist

Details

npm

2026-02-24 13:57:34 +00:00

0

Sindre Sorhus

Project Site

MIT

latest

2.2 KiB

Assets (1)

has-flag-4.0.0.tgz 2.2 KiB

Versions (2) View all

4.0.0

2026-02-24

3.0.0