Angular 2 is built on TypeScript, which uses ES6 syntax and compiles to vanilla JavaScript. Standard ES5 JavaScript is also valid TypeScript, so you can still use your existing code. Where TypeScript differs is in the typing system.
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Get Started With Angular 2 and TypeScript
Angular 2 is built on TypeScript, which uses ES6 syntax and compiles to vanilla JavaScript. Standard ES5 JavaScript is also valid TypeScript, so you can still use your existing code. Where TypeScript differs is in the typing system.
Full article