Is Typescript != ES6?

Question

I thought that Typescript supported all the new constructs of ES6. I was just playing with examples from http://www.2ality.com/2015/08/es6-map-json.html and for example,

var a = new Map([[true, 7], [{foo: 3}, ['abc']]])

Gives errors, lots of them. Where am I going wrong?

Yes, Typescript is different from ES6, although it has incorporated many of the ES6 constructs. — Bergi
– Bergi, Commented Aug 18, 2015 at 15:21
Also, make sure the compiler is targeting ES6. TypeScript doesn't do this by default. You can do this by setting the --target flag. — thoughtrepo
– thoughtrepo, Commented Aug 18, 2015 at 17:46
@mallison dont use --target es6 unless the runtime supports all the es6 features that typescript at the moment ..... which at the time of this writing are none of node/chrome/firefox. So Don't — basarat
– basarat, Commented Aug 19, 2015 at 0:58
@basarat The question is about writing ES6, where it can be used or not is irrelevant. It could be sent through something Babel. — thoughtrepo
– thoughtrepo, Commented Aug 19, 2015 at 14:41

Robert Harvey · Accepted Answer · 2016-07-02 15:49:06Z

2

Most likely you'll need to write a .d.ts typing for it.

Here's one that is as simple as it gets to allow you to instantiate the class the way you would expect.

interface MapStatic {
    new(m: any): MapInstance;  /*Use 'any' if you don't want typing, 
                               and don't want to maintain the MapInstance */
}
interface MapInstance {
}
declare var Map: MapStatic;

Just in case you need it, here's the guide.

The Typescript roadmap says that Map is a complete feature. I'd double check to make sure you have the latest typescript installation. Get it through node.js with this install command:

npm install -g typescript

edited Jul 2, 2016 at 15:49

Robert Harvey

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answered Aug 18, 2015 at 15:40

Zachary Dow

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1 Comment

pitosalas Over a year ago

Yes I did have the latest typescript, but didn't import the typing file for it. That's likely my problem.

basarat · Accepted Answer · 2015-08-19 01:00:24Z

0

but I thought that Typescript supported all the new constructs of ES6

Not all of them. See : https://kangax.github.io/compat-table/es6/ Specifically

answered Aug 19, 2015 at 1:00

basarat

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1 Comment

pitosalas Over a year ago

That does answer the title of this question. But, as far as Map itself is concerned, which was my example, that is fully supported per the compat table.

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