How do you define custom key modifier aliases?

You can define custom key modifier aliases via the global config.keyCodes. There are few guidelines for the properties

1. You can't use camelCase. Instead you can use kebab-case with double quotation marks
2. You can define multiple values in an array format

Vue.config.keyCodes = {
f1: 112,
"media-play-pause": 179,
down: [40, 87]
}