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# ow [](https://travis-ci.org/sindresorhus/ow)
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> Argument type validation
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<img src="header.gif" width="220" align="right">
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## Install
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```
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$ npm install ow
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```
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## Usage
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```js
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const ow = require('ow');
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const unicorn = input => {
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ow(input, ow.string.minLength(5));
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…
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);
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unicorn(3);
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//=> ArgumentError: Expected argument to be of type `string` but received type `number`
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unicorn('yo');
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//=> ArgumentError: Expected string length to be minimum 10
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```
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## Maintainers
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- [Sindre Sorhus](https://github.com/sindresorhus)
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- [Sam Verschueren](https://github.com/SamVerschueren)
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## License
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MIT
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