gcanti/monocle-ts

Health v2 · maintenance only

Adoption not part of the score

1075 stars · 55 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

monocle-ts is a TypeScript library providing functional optics (Lenses, Prisms, Isos, Traversals, and more), ported from the Scala Monocle library. It enables concise, composable, and type-safe updates to deeply nested immutable data structures.

Use cases

• update nested immutable objects without verbose spread copies
• compose lenses to zoom into deeply nested fields
• modify immutable state in a type-safe functional style
• focus on optional or array elements with prisms and traversals
• reduce boilerplate when transforming deeply nested TypeScript data

When to choose

• you work with deeply nested immutable data in TypeScript
• you already use fp-ts and want a functional optics library
• you want composable, type-safe accessors instead of manual spread chains

When to avoid

• your data structures are shallow and simple spreads suffice
• you prefer mutable state or don't use functional programming patterns
• you need a library with frequent updates - the latest release is from late 2022

Facets

library · maturity maintenance

serialization developer-tools developer-tools web-development cross-platform optics lenses immutable-data functional-programming scala-monocle-port fp-ts nodejs typescript

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