Type-checking Redux State with propTypes (without React)

example.js

import propTypes from 'prop-types'
const pTypes = {
    name: propTypes.string.isRequired,
    age: propTypes.number.isRequired,
}

const obj = {
    name: 16,
    age: 'John',
}

propTypes.checkPropTypes(
    pTypes,
    obj,
    'property',
    'obj',
)

output.txt

Outputs in console:
Warning: Failed property type: Invalid property `age` of type `string` 
supplied to `obj`, expected `number`.