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90 lines
1.6 KiB
90 lines
1.6 KiB
# has-flag [](https://travis-ci.org/sindresorhus/has-flag)
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> Check if [`argv`](https://nodejs.org/docs/latest/api/process.html#process_process_argv) has a specific flag
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Correctly stops looking after an `--` argument terminator.
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---
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<div align="center">
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<b>
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<a href="https://tidelift.com/subscription/pkg/npm-has-flag?utm_source=npm-has-flag&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
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</b>
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<br>
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<sub>
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
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</sub>
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</div>
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---
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## Install
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```
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$ npm install has-flag
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```
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## Usage
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```js
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// foo.js
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const hasFlag = require('has-flag');
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hasFlag('unicorn');
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//=> true
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hasFlag('--unicorn');
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//=> true
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hasFlag('f');
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//=> true
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hasFlag('-f');
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//=> true
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hasFlag('foo=bar');
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//=> true
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hasFlag('foo');
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//=> false
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hasFlag('rainbow');
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//=> false
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```
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```
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$ node foo.js -f --unicorn --foo=bar -- --rainbow
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```
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## API
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### hasFlag(flag, [argv])
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Returns a boolean for whether the flag exists.
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#### flag
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Type: `string`
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CLI flag to look for. The `--` prefix is optional.
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#### argv
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Type: `string[]`<br>
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Default: `process.argv`
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CLI arguments.
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## Security
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To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
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## License
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MIT © [Sindre Sorhus](https://sindresorhus.com)
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