Developing a personalized validation function using Typescript for the expressValidator class - parameter is assumed to have a type of 'any'

I'm seeking to develop a unique validation function for express-validator in typescript by extending the 'body' object.

After reviewing the helpful resource page, I came across this code snippet:

import { ExpressValidator } from 'express-validator';

const { body } = new ExpressValidator(
  {
    isPostID: async value => {
      // Confirm if the value aligns with the post ID format
    },
  },
);

When trying to implement this in VS Code, I encountered the error message "Parameter 'value' implicitly has 'any' type". One option would be to modify it to

isPostID: async value:any => ...
, but we are certain that the passed value will always be a string. I am unsure how to inform Typescript about this constraint. If you have any suggestions, please share them!

Answer №1

Recently discovered the effectiveness of defining a value as a string in this example:

isPostId: async (value: string) => ...

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