Angular 2.0：Typescript是否支持ES6的所有功能？

Question

Typescript started by claiming that it is a superset of Javascript. Now with ES6 around the corner. Does the current typescript transpiler/compiler support all the es6 features and syntax as it is or does it deviate from es6 interms of syntax for module export/import, arrow functions, etc?

I am asking because I am trying to learn angular 2.0 but am not able to decide whether to follow typescript path or vanilla JS path.

Answer 1

Regarding features, see What's new in TypeScript and the Roadmap . ( There doesn't seem to be any page that directly compares ES6/ES2015 features to TypeScript though. See @alexpod's answer.)

I suggest you use TypeScript, if for nothing else, for the extra type checking. When Angular converted their code over to TypeScript, it revealed a number of bugs.

TypeScript's primary purpose is not to add features to JavaScript – as is the purpose of ES2015 – but to make it easier and safer for developers to write and maintain large JavaScript applications. The primary benefit of TypeScript shows up before your application runs – when you're writing or maintaining code. Intellisense, code completion, type checking, etc.

Answer 2

Look at this table . It will show you what typescript and other transpilers/environments support right now.

Answer 3

On top of Mark's answer , I should add that TypeScript and other transpilers allow you to use several ES6 features today. I wouldn't dream of launching a public facing website built entirely using ES6 today (early 2017), because old browsers don't die easy. TypeScript removes that inhibition altogether and also adds some innovations of its own.