Utils

Some small generic utilities used by the FocusNavigationService workspace, set aside so that they can be more easily extracted later if desired

createSignal

type Subscription = {
    unsubscribe: () -> (),
}

type Signal<T> = {
    subscribe: (self: Signal<T>, (T) -> ()) -> Subscription
    getValue: (self: Signal<T>) -> T
}
type FireSignal<T> = (T) -> ()

function createSignal<T>(initialValue: T): (Signal<T>, FireSignal<T>)

Creates a subscribable signal object and returns it along with a function that can be used to fire the signal with new values.

Consumers of the signal can subscribe to it with the subscribe method or retrieve its current value with the getValue method.

Subscribing to a signal returns a Subscription object, which contains an unsubscribe method that disconnects the subscription, preventing it from being triggered by subsequent updates.

shallowEqual

type Table = { [any]: any }

function shallowEqual(a: Table, b: Table): boolean

Shallowly compares two tables, returning true if they have the same members with the same values or false if they have differing keys or differing values for the same key.