const regularMap = new Map();
regularMap.set('hello', true);
const manyKeysMap = new ManyKeysMap();
manyKeysMap.set(['hello', 'world'], true);

const handlers = new ManyKeysMap();
handlers.set([element, 'click'], onClickFn);
handlers.set([element, 'keypress', {passive: true}], onKeypressFn);
// Since objects are stored by reference, it’s best to stringify `options` object like the above
handlers.set([element, 'keypress', JSON.stringify({passive: true})], onKeypressFn);

import ManyKeysMap from 'many-keys-map';
const groups = new ManyKeysMap();
groups.set([header, 'admin'], true);
groups.set([target, 'tools'], [1, 'any value is supported']);
const data = new ManyKeysMap([
	[['hello key'], 'value'],
	[[42, null], new Date()]
]);
data.get(['hello key']);
// => 'value'
data.get([42, null]);
// => date Object
data.get(['42']);
// => undefined
data.has([Symbol()]);
// => false
for (const [keys, value] of data) {
	console.log(keys);
	console.log(value);
}
// => ['hello key']
// => 'value'
// => [42, null]
// => date Object