Effect

The missing standard library for TypeScript.

An open-source TypeScript ecosystem and runtime for building reliable, composable applications, with typed errors, concurrency, resource management, and observability-oriented capabilities.

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releaseSECONDARY2026-10-07

Theo releases tsc-rs, a Rust TypeScript compiler with claimed compatibility

Theo released tsc-rs with claimed TypeScript compatibility, an LSP, WASM support and Effect checks. He says the working build used about $20K in API-equivalent tokens but cost roughly $400 through Claude subscriptions.