# Hook: onTick()
Called when a new market tick is available for a watched symbol.
The hook is active only for the symbols with watchTicks
directive
enabled. This hook is queued, this means that there can be only
one hook call at time and the next hook call will wait for the current
one to resolve.
- Interface
class MidaTradingSystem {
protected onTick (tick: MidaTick): Promise<void>;
}