In `types.js` add the following 👇 ```js let somethingUndefined; const somethingNull = null; ``` _NOTE: you cannot use a const variable without setting a value._ `somethingUndefined` is undefined ...

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By the time the section ends, even if the app itself is small, the lessons in TypeScript will be significant. This is because we will cover topics across the board, such as DOM typing, type assertions ...