Typescript Tuples

Learning how TypeScript 3.0, a typed superset of JavaScript, improves tuples type and introduces a new 'unknown' top type!

TypeScript 3.0 is out! It comes with enhancements for the type system, compiler, and language service. This release is shipping with the following:

• Project references let TypeScript projects depend on other TypeScript projects by allowing tsconfig.json files to reference other tsconfig.json files.
• Support for defaultProps in JSX.
• Tuples in rest parameters and spread expressions with optional elements.
• New unknown top type! It's the type-safe counterpart of any.