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const classNames = require('classnames');

classNames('foo', 'bar'); // => 'foo bar'

classNames('foo', { bar: true }); // => 'foo bar'

classNames({ 'foo-bar': true }); // => 'foo-bar'

classNames({ 'foo-bar': false }); // => ''

classNames({ foo: true }, { bar: true }); // => 'foo bar'

classNames({ foo: true, bar: true }); // => 'foo bar'

// lots of arguments of various types
classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'

// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'