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Sébastien TIMONER
Expert in web development and technical team management, I specialize in creating and optimizing high-performance digital solutions. With deep expertise in modern technologies like React.js, Node.js, TypeScript, Symfony, Docker, and FrankenPHP, I ensure the success of complex SaaS projects, from design to production, for companies across various sectors, at offroadLabs.
satisfies
operatorThe satisfies
operator is one of TypeScript's most powerful features for type validation. Introduced in version 4.9, it offers a perfect balance between strict type checking and smart type inference. Let's discover together how to use it effectively.
satisfies
solvesIn TypeScript, we often need to verify that an object matches a specific type while preserving exact information about its properties. Traditional approaches have limitations:
typescript
satisfies
operator to the rescuesatisfies
allows us to have the best of both worlds:
typescript
typescript
typescript
Use satisfies
for configuration objects
Prefer satisfies
over type assertions
as
because validation is done at definitionCombine with utility types
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Don't overload types
typescript
Be careful with union types
typescript
The satisfies
operator is a powerful tool for type validation in TypeScript. It allows you to:
By using it judiciously, you can make your code more robust while maintaining the flexibility needed for your application.
💡 Pro tip: Use satisfies
when you need to validate a type while maintaining
precise property inference. It's particularly useful for configuration objects
and typed constants.