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The minimum code

const presenter = new WinPresenter(reelSet, {
  stagger: 70,
  symbolAnim: async (symbol, cell, win) => {
    const peak = win.id === 0 ? 1.35 : 1.18;  // per-win styling
    await bouncePulse(symbol.view, peak, 220);
  },
});

Three modes in one field

symbolAnim accepts three shapes:

Value	Behaviour
`'win'` (default)	calls `symbol.playWin()`. your `ReelSymbol` subclass’s hook
any other string	calls `symbol.playAnimation(name)` if present (e.g. `SpineSymbol`), else falls back to `playWin()`
`(symbol, cell, win) => Promise<void>`	fully custom. you decide what to run

The presenter still owns dim, stagger, events, and cancellation. the callback only replaces the per-cell gesture.