TypeScript is inferring the return type of a returned function as any

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TypeScript is inferring the return type of a returned function as any

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This usually happens when TypeScript cannot infer the type of a function that returns another function, so it falls back to any. The fix is to explicitly type the return value.

.function createHandler() {
return function (req, res) {
return req.body;
};
}

function createHandler(): (req: Request, res: Response) => unknown {
return function (req, res) {
return req.body;
};
}

type Handler = (req: Request, res: Response) => unknown;

function createHandler(): Handler {
return (req, res) => {
return req.body;
};
}