Convert react javascript project to typescript - one file at a time!

How to convert a javascript react js project into typescript.
(Note: copy/paste text for command line is below in this description)

Have a huge legacy ReactJS project that you want to sprinkle typescript into, without having to convert the whole codebase?

This video shows how I actually did this, and is easy for you to do too.

Here are some of the text that I used in this video for easy copy/pasting:
npm install --save typescript @types/node @types/react @types/react-dom @types/jest

yarn add typescript @types/node @types/react @types/react-dom @types/jest

npx tsc --init

declare module 'src/history';
@typescript-eslint/parser

[Casanova_]

The zoom is great I can see everything perfectly on my flip phone!

[MasterForm]

I appreciate the zoom level. Great for watching on a phone screen!

[upendrasingh-eofx]

this is what I was looking for, many thanks

[swaap]

Thanks a lot man i was struggling with this

[michaelyabut]

I'm here to talk about the zoom level. Zoom zoom, creator

[BiggieBigM]

im using ipad the zoom is good but bad

[dsein]

Great video man, thanks for sharing. I would just suggest you zoom out a bit.