What is auth0-rules-types?

This package gives TypeScript developers type definitions for Auth0 Rules, a feature that lets you run custom code during the authentication process to modify user data or add extra logic to your login flow. When you write an Auth0 Rule, you're working in a special runtime environment provided by Auth0. That environment gives you access to objects like the user being authenticated, context about the login attempt, and a callback function to complete the process. Without type definitions, your code editor can't tell you what properties and methods are available on these objects, so you lose autocomplete and catch errors only at runtime. This package solves that by providing a complete map of what those objects look like, so TypeScript (and your editor) can help you write correct code from the start. The package works by declaring the shape of four main types: the user object, the context object, the callback function, and the rule function itself. When you import it, these types become available globally throughout your project, letting you annotate your rule code with proper types. The README also shows how to add custom type definitions for two optional Auth0 Rule features, the cache (for storing data across rule executions) and configuration (for setting environment-specific values). You can extend the basic types with your own keys and values to match your specific setup. This is most useful for teams building Auth0 Rules in TypeScript rather than plain JavaScript. If you're customizing authentication flows, adding extra validation, or syncing user data with external systems during login, having type safety helps prevent bugs and makes your code easier to maintain as it grows. It's a small package that bridges the gap between Auth0's runtime environment and TypeScript's type checking, so your development experience feels as smooth as working with any other typed library.