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Sindre Sorhus
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readme.md
ow 
Argument type validation
Install
$ npm install ow
Usage
const ow = require('ow');
const unicorn = input => {
ow(input, ow.string.minLength(5));
…
);
unicorn(3);
//=> ArgumentError: Expected argument to be of type `string` but received type `number`
unicorn('yo');
//=> ArgumentError: Expected string length to be minimum 10
Maintainers
License
MIT