Node unable to run compiles TypeScript

Question

I have the following TypeScript

var foo = (...myParams) => {
    for (var i = 0; i < myParams.length; i++){
        console.log(myParams[i] + " ");
    }
};

foo('a', 'b', 'c');

However, when it's compiled by WebStorm finds errors in the compiled code:

and when it's rune by Node, Node doesn't recognise the rest expression.

C:\PluralSight\TypeScript>node rest-parameter.js
C:\PluralSight\TypeScript\rest-parameter.js:5
var foo = (...myParams) => {
           ^^^

SyntaxError: Unexpected token ...
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:414:25)
    at Object.Module._extensions..js (module.js:442:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Function.Module.runMain (module.js:467:10)
    at startup (node.js:136:18)
    at node.js:963:3

@squint Cool link. Node just doesn't support them. C'est la vive. — BanksySan
– BanksySan, Commented Apr 18, 2016 at 13:29
@BanksySan if you change typescript to target ES5 it will work — David Sherret
– David Sherret, Commented Apr 18, 2016 at 13:40
Cheers @DavidSherret, can I do that in WebStorm? It's be less hassle that having to use tsc at the command line. — BanksySan
– BanksySan, Commented Apr 18, 2016 at 14:05
@BanksySan you should look into using a tsconfig.json file—specify "target": "ES5" under "compilerOptions". WebStorm should support that. — David Sherret
– David Sherret, Commented Apr 18, 2016 at 14:15

Amid · Accepted Answer · 2016-04-18 16:59:01Z

3

As a side note regarding node.

It does support rest parameters in 5.x version. They are not enabled by default alongside with plenty other es6 goodies.

To enable them run node with --harmony parameter or if some of features are still work in progress - explicitly enable them with corresponding flags. For example:

node --harmony --harmony_default_parameters app.js

Use the following command to see all of such 'in progress' ones:

node --v8-options | grep 'in progress'

answered Apr 18, 2016 at 16:59

Amid

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3 Comments

BanksySan Over a year ago

Should node --harmony --harmony_default_parameters be node --harmony --harmony_rest_parameters?

BanksySan Over a year ago

Is there a way to enable all the bleeding edge tech?

Amid Over a year ago

No - for rest parameters its enough to have --harmony. As they are not in progress. So to get bleeding edge use --harmony and all 'in progress' params (its not so many) specified manually

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