"But the cracks show fast once you look at how modern apps behave. With so much async work and UI reacting to everything, error boundaries feel more fragile than protective. They look solid on the surface, but in practice, they only catch one narrow class of failures: render-time exceptions. They're tied to the component render lifecycle, which is a synchronous moment, so anything that happens outside that moment - async calls, event handlers, background operations - slips straight past them."
"This isn't sustainable as apps get more reactive and more distributed. That's where signals come in. Signals give you a precise and consistent way to handle errors, no matter when or where they happen. They're not bound to the component tree, and they don't rely on the render cycle. Instead, they treat errors as a reactive state that flows through your application."
Error boundaries only capture synchronous render-time exceptions tied to the component render lifecycle. Modern apps rely heavily on asynchronous work, event handlers, background operations, and reactive data, which fall outside render-time and bypass error boundaries. As a result, error boundaries can feel fragile and insufficient for comprehensive fault handling. Signals present errors as a reactive state that flows through the application independently of the component tree and render cycle. Signals provide a precise and consistent mechanism to surface and handle errors regardless of timing or origin. Adopting signals enables cleaner, more resilient error handling across reactive and distributed application architectures.
Read at LogRocket Blog
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