GoKawiilEffect releases version 4.0 with rebuilt runtime and consolidated packages
Effect has shipped version 4.0, a ground-up rewrite that the maintainers say is faster, lighter on memory, and produces smaller bundles than Effect 3.x. The release also merges previously separate packages into the core effect package, which now has zero runtime dependencies, and unifies versioning across the ecosystem.
GoKawiil's interpretation of the reporting above, not reported fact.
The performance claims—smaller minimal bundles, higher concurrent task throughput, and lower memory per fiber—suggest Effect is positioning itself for larger-scale and resource-constrained deployments, according to figures the maintainers published. Removing third-party runtime dependencies could reduce supply-chain risk for teams relying on it, and the reported jump in weekly npm downloads indicates growing adoption, though these are the project's own benchmarks and metrics rather than independently verified figures.
- Effect 4.0 claims 5x smaller bundles, 6.4x higher task throughput, and 86% less memory per fiber versus 3.x
- The core effect package now has zero runtime dependencies, consolidating previously separate packages into one version
- Weekly npm downloads reportedly reached 43.9M, with 4.x already accounting for 56% of recent downloads
Source: effect.website — Sebastian Lorenz, 2026-10-01
Published there as: “Effect 4.0”
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