Typescript

• Typescript is a language that compiles to JavaScript
• Includes "type information" in your code
• When it compiles, it checks that your declared types match your code
• Lets IDEs provide suggestions for your code

function addNumbers(a: number, b: number): number {
    return a + b;
}

addNumbers(1,2) // This is allowed
addNumbers("a", { name: "bob" }) // This does not compile