============================================================================ MULTI SLOT - UNIFIED MULTI-SIGNAL WIDGET

A widget that rebuilds when any of multiple signals change.

MultiSlot provides a clean, efficient way to subscribe to multiple signals without deeply nested builders. It uses a single subscription per signal and rebuilds once when any signal changes.

Type-Safe Factory Constructors

Use the numbered factory constructors for compile-time type safety:

// Two signals
MultiSlot.t2(
  connect: (nameSignal, ageSignal),
  to: (context, name, age) => Text('$name is $age'),
)

// Three signals
MultiSlot.t3(
  connect: (a, b, c),
  to: (context, v1, v2, v3) => Text('$v1 $v2 $v3'),
)

Dynamic List of Signals

For a variable number of signals (loses type safety):

MultiSlot.list(
  connect: [signal1, signal2, signal3],
  to: (context, values) => Text(values.join(', ')),
)

Comparison with Nested Slots

Instead of:

Slot(
  connect: signal1,
  to: (ctx, v1) => Slot(
    connect: signal2,
    to: (ctx, v2) => Slot(
      connect: signal3,
      to: (ctx, v3) => MyWidget(v1, v2, v3),
    ),
  ),
)

Use:

MultiSlot.t3(
  connect: (signal1, signal2, signal3),
  to: (ctx, v1, v2, v3) => MyWidget(v1, v2, v3),
)