Question 1

How to validate an email address with computed-types?

Accepted Answer

You need to create a custom validator using an external library like 'email-validator', as shown in the README, by defining a function that throws on invalid input and integrating it with .transform() for chainable methods.

Question 2

Is computed-types better than Joi for TypeScript?

Accepted Answer

Computed-Types provides automatic TypeScript interface generation, reducing boilerplate and ensuring type safety, whereas Joi requires manual type definitions. However, Joi has a larger ecosystem and more built-in validators out of the box.

Question 3

How to handle async validation for API calls?

Accepted Answer

Computed-Types automatically detects promises in custom validators, allowing you to return a Promise that resolves or rejects based on async checks, such as username availability via fetch, as demonstrated in the README.

Question 4

Can computed-types work with Node.js and Express?

Accepted Answer

Yes, it's zero dependencies and supports both synchronous and asynchronous validation, making it suitable for Node.js backends to validate request bodies or API responses without additional setup.

Question 5

What's the difference between computed-types and Zod?

Accepted Answer

Both offer type-safe validation, but Computed-Types focuses on function-based schemas with automatic interface generation and chainable methods, while Zod uses a more declarative schema syntax and has a larger community with more integrations.

Question 6

How to make a field optional in a schema?

Accepted Answer

Use the .optional() or .strictOptional() methods on validators, like string.trim().optional(), which allows undefined or null values and adjusts the TypeScript interface accordingly, as shown in usage examples.

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