Effect 4.0 Ships: Dependency-Free Rewrite with 5x Smaller Bundles and Long-Term Support
Effect 4.0, a TypeScript framework for typed errors and structured concurrency, was released on 30 September 2026 with a rewritten fiber runtime. The team reports a bundle size drop from 35.6 kB to 7.1 kB and about 6.4x higher throughput, though these figures…
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