What type of information is required after the colon : in this specific function?
public saveHistory(log: String): "HERE!" {
return async (req: Request, res: Response, next: NextFunction): Promise<Response | void> => {
try {
...
} catch (e) {
...
}
};
}
(req: Request, res: Response, next: NextFunction) => Promise<Response | void>
In the return statement provided, there is an absence of the async keyword (since it returns a Promise already) and the syntax for the function return changes from : to =>. However, in most scenarios, including this one, omitting the : is acceptable as TypeScript can deduce the return type from the return statement.
function saveHistory(log: String):
(req: Request, res: Response, next: NextFunction) => Promise<Response | void> {
return async (req: Request, res: Response, next: NextFunction): Promise<Response | void> => {
try {
// ...
} catch (e) {
// ...
}
};
}
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