typescript-satisfies-operator

To preserve literal types in TypeScript, use the satisfies operator to validate values against a type without altering the inferred literal union. This prevents unwanted type widening that typically occurs when using standard colon type annotations.

Use the satisfies operator in TypeScript when you need to validate configuration objects against a specific type while keeping exact literal inference for autocomplete. Unlike as const, it allows type checking without forcing readonly immutability.

TypeScript widens literal types with type annotations because it allocates the declared type to the variable, discarding the exact literal union. Using the satisfies operator validates the value while retaining the precise literal type for safer static analysis.

Yes, you can use the satisfies operator to validate object literals in a TypeScript config. It checks the structure against an expected API type while preserving the narrow literal unions of the object's properties for precise autocomplete and safety.

No, the satisfies operator does not alter runtime behavior in TypeScript. It functions purely as a compile-time static analysis check, ensuring exact type inference and type safety without emitting any additional JavaScript code.