Issues with verifying input of properties in TypeScript React components are not being

I am grappling with a typescript issue as I am fairly new to it. My problem lies in the fact that I have defined an interface and I am validating the props. It works fine when the props are empty, but I am supposed to receive a string and if a number is passed instead, no error is being thrown.

type Props = {
  name: number;
};

const ProductListItem = ({ name }: Props): JSX.Element => {
  return (
    <div className="product">
      <h4>{name}</h4>
    </div>
  );
};

export default ProductListItem;

Usage of the Component:

import "./ProductList.scss";
import ProductListItem from "./ProductListItem";

interface Product {
  _id: string;
  itemName: string;
}
type Props = {
  allProducts: Array<Product>;
};

const ProductList = ({ allProducts }: Props): JSX.Element => {
  console.log(allProducts);
  const productsTodisplay = allProducts.map((product: any) => (
    <ProductListItem key={product._id} title={product.itemName} />
  ));
  return <section className="productsContainer">{productsTodisplay}</section>;
};

export default ProductList;

Answer №1

Enhance type safety in React Functional Component by specifying its type within the generic type parameter

Here is an example:

import React, { FunctionComponent } from "react";

type Props = {
  name: number;
};

const ProductListItem: FunctionComponent<Props> = ({ name }) => {
  return (
    <div className="product">
      <h4>{name}</h4>
    </div>
  );
};

export default ProductListItem;

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