Does this Spread Operator Usage Check Out?

Upon reviewing Angular's API documentation, I came across the declaration for the clone() method in HttpRequest as follows:

clone(update: { headers?: HttpHeaders; reportProgress?: boolean; params?: HttpParams; responseType?: "arraybuffer" | "blob" | "text" | "json"; withCredentials?: boolean; body?: T; method?: string; url?: string; setHeaders?: { ...; }; setParams?: { ...; }; }): HttpRequest

My curiosity arose regarding the usage of "{...;}" after the "setHeaders?:" property in TypeScript type declaration. After conducting thorough research, it seems that the spread operator functionality is not commonly used in this context. Could this be a unique feature present only in Angular's documentation? Your insights are greatly appreciated.

javascriptangulartypescript

Answer №1

The instructions provided are a bit unclear. Essentially, what it's attempting to convey is the presence of the setHeaders property, which should be an object with certain properties. This can be seen in an example at this link:

// To set new header in one step, clone the request.
const authReq = req.clone({ setHeaders: { Authorization: authToken } });

It's important to note that the code snippet directly from the documentation does not represent valid JavaScript or TypeScript syntax.

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