Yup

How to get it

1. 1

   Install with a package manager

   You'll need: Node.js

   Install yup

   git clone https://github.com/jquense/yupCopy
2. 2

   Run it

   • Import the helpers you need, for example: import { object, string, number } from 'yup';
   • Define a schema with object() and its field schemas.
   • Call schema.validate(data) with await to check a value and get the parsed result.
   • Use schema.cast(data) if you only want type conversion without assertions.
3. 3

   Get the most out of it

   • Use { strict: true } in validate when input is already parsed, to skip parsing overhead
   • Use InferType to derive TypeScript types from your schema instead of writing them twice
   • Use .when() to create conditional rules that depend on other fields
   • Use addMethod to extend built-in schema types with your own methods
   • Use .label() and custom messages to make error output clearer for users