How can global variables be used in Typescript?

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Global variables can be used in Typescript by declaring them outside of any function or class, at the top level of the file.

For example:

let message: string = 'Hello, world!';

function displayMessage() {
  console.log(message);
}

displayMessage(); // Output: "Hello, world!"

However, it is generally not recommended to use global variables in Typescript, as it can lead to potential naming conflicts and make it harder to manage the state of the application. It is better to use local variables and pass them as arguments between functions and classes. Alternatively, global variables can be encapsulated within a single module or namespace to avoid conflicts.