Because you used var name = ..., TypeScript thinks you are referring to window.name, which TypeScript considers deprecated. You can fix this error by:

1. Use a different variable identifier, like anotherName -

var anotherName = 'Bob'

console.log(anotherName)

2. Move the code inside a function. -

(() => {
  var name = 'bob'

  console.log(name)
})()

I think this is due to the fact that a 'loose' variable in a browser, declared with var, outside of a function is just going to end up pointing to:

window.name 

And window.name has a special meaning, and is indeed deprecated.

It's a quirk of the language. If you didn't intend to create the variable in a global scope, you might be better off just declaring it in a function.

This will not have the same problem:

function main() {
   const name = 'Foo';
}
main();

Generally it's a good idea to avoid creating any global symbols unless you explicitly intend to.