Typescript is outputting the error message: "cannot be assigned to the type 'IntrinsicAttributes & { children?: ReactNode; }'"

While there has been extensive discussion on this topic, I am unable to get any other solutions from SO to work, or I am struggling to implement them.

I am completely new to TypeScript, and here is what I have:

import faker from "faker";
import React from "react";
import Index from "../components/Index";
import List from "../components/List";

interface Props {
  departments: [
    {
      id: number;
      name: string;
    }
  ];
}

const IndexPage: React.FunctionComponent<Props> = ({ departments }) => {
  return (
    <>
      <Index />
      <List departments={departments} />
    </>
  );
};

export async function getStaticProps() {
  let departments: { id: number; name: string }[] = [];

  for (let i = 0; i < 50; i += 1) {
    const name: string = await faker.company.companyName();
    departments = [...departments, { id: i, name }];
  }

  return {
    props: {
      departments,
    },
  };
}

export default IndexPage;

Even though I am uncertain about implementing TypeScript correctly, the compiler is showing this error:

Type '{ departments: [{ id: number; name: string; }]; }' is not assignable to type 'IntrinsicAttributes & { children?: ReactNode; }'.
Property 'departments' does not exist on type 'IntrinsicAttributes & { children?: ReactNode; }'.

The error is specifically related to the departments prop in the <List> component.

What is causing this error to occur, and how can I resolve it?

Answer №1

When Typescript notifies you that you are attempting to assign the property departments to an object (specifically, a React component) that does not have that property in its type, it is indicating a mismatch.

The type

'IntrinsicAttributes & { children?: ReactNode; }'
serves as the default typing for a react component; however, since departments is not part of the props defined in this type, you cannot pass that particular prop to the List component.

To resolve this issue, you simply have to include the departments property in the definition of List's props.

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