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array-union 
Create an array of unique values, in order, from the input arrays
Install
$ npm install array-union
Usage
const arrayUnion = require('array-union');
arrayUnion([1, 1, 2, 3], [2, 3]);
//=> [1, 2, 3]
arrayUnion(['foo', 'foo', 'bar']);
//=> ['foo', 'bar']
arrayUnion(['🐱', '🦄', '🐻'], ['🦄', '🌈']);
//=> ['🐱', '🦄', '🐻', '🌈']
arrayUnion(['🐱', '🦄'], ['🐻', '🦄'], ['🐶', '🌈', '🌈']);
//=> ['🐱', '🦄', '🐻', '🐶', '🌈']
License
MIT © Sindre Sorhus