Write fewer tests by creating better TypeScript types

• ts-pattern

  38 10,882 8.5 TypeScript

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

Switch statements are extremely limited and suffer from a fall-through hazard that can lead to errors and bad practices. Thankfully, several npm packages can help with type-narrowing discriminated unions, and the ts-pattern library is an excellent choice.

• proposal-pattern-matching

  67 5,338 9.1 HTML

  Pattern matching syntax for ECMAScript

  

ts-pattern lets you express complex conditions in a single, compact expression akin to pattern matching in functional programming. There is a tc-39 proposal to add pattern matching to the JavaScript language, but it is still in stage 1.

• SurveyJS

  surveyjs.io sponsored

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• zod

  288 30,347 9.1 TypeScript

  TypeScript-first schema validation with static type inference

A better way is to analyze the data and create a type-safe schema that can execute against the incoming data at runtime. The excellent package Zod brings runtime semantics to TypeScript without duplicating existing types.

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