A deep dive into how React, Vue, Svelte, and SolidJS each handle state update consistency differently. React batches all updates for guaranteed consistency but values lag behind. Solid updates everything eagerly and synchronously. Vue applies state changes immediately but defers derived values and DOM updates. Svelte behaves like plain JavaScript with no consistency guarantees. The author (Ryan Carniato, creator of SolidJS) argues that Solid's eager reactive model is the best default, but acknowledges the tradeoffs of each approach and reveals that Solid 1.5 is exploring a new 'natural' batching model inspired partly by Svelte's simplicity.
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