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Effect V4 Docs

Effect

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Version 4.0.0-beta.85

Patch Changes

  • #2436 328d97c Thanks @MohanedMashaly! - change default operation in redis from LPUSH TO RPUSH

  • #2431 8441836 Thanks @gcanti! - Derive template literal arbitraries from encoded parts, closes #2414.

  • #2439 074e436 Thanks @gcanti! - Allow schema class .extend to accept a Struct and preserve checks from the extension schema, closes #2419.

  • #2444 c1dfd60 Thanks @bweis! - Avoid throwing when Error.stackTraceLimit is non-writable (frozen intrinsics / SES / deterministic sandboxes such as Temporal).

    Effect manipulates Error.stackTraceLimit in several internal spots to capture short or empty stack traces cheaply. In hardened environments where Error is frozen and stackTraceLimit is read-only, assigning to it throws, which broke Effect entirely. Stack-trace-limit manipulation is now best-effort and silently no-ops when the property cannot be modified, mirroring Node’s own internal guard. Behavior in normal (writable) environments is unchanged.

  • #2425 2ba316b Thanks @tim-smart! - Add Random.choice for selecting a random element from an iterable.

  • #2434 7ce7344 Thanks @gcanti! - Use semantic matching for TemplateLiteral parsing and index signature keys

    Replace regex-based TemplateLiteral parsing with backtracking segmentation over template literal parts, applying part checks during matching.

    Use schema membership when selecting Record index signature keys, including checked string, number, symbol, and TemplateLiteral parameters. Tighten valid index signature parameters on both type and encoded sides, and preserve key parameter semantics in codec transformations.