Type-safe event handling in Typescript with zod and ts-match

• zod

  287 30,174 9.1 TypeScript

  TypeScript-first schema validation with static type inference

ws.on("message", (data) => { try { const parsed = EventSchema.parse(JSON.parse(data)); // Parse will throw for invalid events // ^ // `--- CreatePost | UpdatePost switch (parsed.type) { case "CreatePost": ws.send(handleCreatePost(parsed)) // ^ // `---- type of parsed is CreatePost in this branch return; case "UpdatePost": ws.send(handleUpdatePost(parsed)) // ^ // `---- type of parsed is UpdatePost in this branch return; } } catch (e) { console.error(e); // Also see https://github.com/colinhacks/zod#error-formatting } })

• ts-pattern

  38 10,882 8.5 TypeScript

  🎨 The exhaustive Pattern Matching library for TypeScript, with smart type inference.

In many functional languages, we have support for pattern-matching with built in support for exhaustiveness check. Typescript does not have this at the moment but there are userland implementations that emulate pattern matching. One such library is ts-pattern, which I have found to work very well in practice.

• SurveyJS

  surveyjs.io sponsored

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