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JavaScript Building Applications with React and Redux Modularizing the React Scoreboard Application Building the AddPlayerForm Logical Component

Adam Beer
Adam Beer
11,314 Points

[ts] 'types' can only be used in a .ts file.

Hi. I have a problem. Screenshot from my porject.

If I drag the mouse, on to the opening curly bracket, after static propTypes:, then this is the error code -> [ts] 'types' can only be used in a .ts file.

My project is working so this is an interesting mistake for me. How to fix it? Anybody has an idea what is the wrong?

Thanks for the help!

Adam Beer
Adam Beer
11,314 Points

If I rewrite : on to = after the static propTypes it working fine, and doesn't give an error message. But I'm not sure how this is the best way.

1 Answer

Seokhyun Wie
.a{fill-rule:evenodd;}techdegree seal-36
Seokhyun Wie
Full Stack JavaScript Techdegree Graduate 21,606 Points

Seems quite late to answer Adams Q, but for sb who has the same issue like me and the past Adam, This is with function declaration:

function Foo() { 
    this.PropTypes = somePropTypes; // bad
    return <div></div>;
Foo.PropTypes = somePropTypes; // good

This one is with Component:

class Foo extends React.Component {
    static PropTypes = somePropTypes;

These example are from stackoverflow, link is here.

Most importantly, using PropTypes directly from React is deprecated from v16 React, as well as the createClass. You can check your console, but for you information, you can find npm package 'prop-types' here and it's easy to apply so I wouldn't describe everything here. Happy Coding folks!