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# has-flag [](https://travis-ci.org/sindresorhus/has-flag) > Check if [`argv`](https://nodejs.org/docs/latest/api/process.html#process_process_argv) has a specific flag Correctly stops looking after an `--` argument terminator. ## Install ``` $ npm install has-flag ``` ## Usage ```js // 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[]`<br> Default: `process.argv` CLI arguments. ## License MIT © [Sindre Sorhus](https://sindresorhus.com)
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