Function capture_signals

packages/svelte/src/internal/client/legacy.js:16–34

* Capture an array of all the signals that are read when `fn` is called * @template T * @param {() => T} fn

(fn)

 * @param {() => T} fn
 */
function capture_signals(fn) {
	var previous_captured_signals = captured_signals;

	try {
		captured_signals = new Set();

		untrack(fn);

		if (previous_captured_signals !== null) {
			for (var signal of captured_signals) {
				previous_captured_signals.add(signal);
			}
		}

		return captured_signals;
	} finally {
		captured_signals = previous_captured_signals;
	}
}

/**
 * Invokes a function and captures all signals that are read during the invocation,