JAVASCRIPT

install proptypes react

npm install --save prop-types

PropTypes

import PropTypes from "prop-types";

MyComponent.propTypes = {
  name: PropTypes.string,
  id: PropTypes.number.isRequired,
  img: PropTypes.string
  grades: PropTypes.arrayOf(PropTypes.number),
  friends: PropTypes.arrayOf(
    PropTypes.shape({
      id: PropTypes.number,
    })
  ),
  list: PropTypes.arrayOf(PropTypes.any),
};

MyComponent.defaultProps = {
  img: "https://picsum.phones/200/300",
}

react proptypes

import PropTypes from 'prop-types';

class Greeting extends React.Component {
  render() {
    return (
      <h1>Hello, {this.props.name}</h1>
    );
  }
}

Greeting.propTypes = {
  name: PropTypes.string
};

npm prop-types

npm install --save prop-types

react using proptypes

import React from 'react';
import PropTypes from 'prop-types';

const Example = (props) => {
  return (
    <div>
      <p>Some prop: {props.some}</p>
      <p>Other prop: {props.other}</p>
    </div>
  );
};

Example.propTypes = {
  some: PropTypes.string.isRequired,
  other: PropTypes.number.isRequired
};

export default Example;

react proptypes example

// proptypes using class component
Detaljer.PropTypes = {
  detaljer: PropTypes.string.isRequired,
  feilkode: PropTypes.string,
  removeEvent: PropTypes.string.isRequired
};

// proptypes using function component
Detaljer.propTypes = {
  detaljer: PropTypes.string.isRequired,
  feilkode: PropTypes.string,
  removeEvent: PropTypes.string.isRequired
};

import prop-types

import PropTypes from 'prop-types'; // ES6var PropTypes = require('prop-types'); // ES5 with npm

prop type of react component

type OscarProp = {
  children: React.ReactNode;
};

prop type of react component

type OscarProp = {
  children: React.ReactNode;
};

set propTypes

itemName.propTypes = {
  props: PropTypes.dataType.isRequired
};

proptypes for a react component

//You can now use `PropTypes.elementType`
// to validate for Component type props

proptypes

import PropTypes from 'prop-types'; // ES6
var PropTypes = require('prop-types'); // ES5 with npm