constructor(ctrlKey, shiftKey, altKey, metaKey, scanCode) {
        this.ctrlKey = ctrlKey;
        this.shiftKey = shiftKey;
        this.altKey = altKey;
        this.metaKey = metaKey;
        this.scanCode = scanCode;
    }
Represents a chord which uses the `code` field of keyboard events.
A chord is a combination of keys pressed simultaneously.