Why PhpStorm is highlighting this as error in my JavaScript declaration

Question

I've declared this JS function and PhpStorm is highlighting it as an error, saying that ,or) expected.

function getData(params, toCache=true) { ...

Why is PhpStorm highlighting toCache=true as an error? Is this not the correct way to declare default params in JavaScript? My code is working, so is this just a bug in PhpStorm.

Settings > Languages & Frameworks > JavaScript > select "ECMAScript6" from dropdown. — Mjh, Jan 12 '17 at 08:44

score 3 · Accepted Answer · answered Jan 12 '17 at 08:43

3

This is probably because default parameters are part of ES6 specification and your project environment is set to ES5.

answered Jan 12 '17 at 08:43

pwolaq

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that's it exactly, found an answer for it here too http://stackoverflow.com/a/37571826/1814446 - if I could I would down vote myself – Holly Jan 12 '17 at 08:45

score 1 · Answer 2 · answered Jan 12 '17 at 08:53

Probably, You set PhpStorm to ES5 where default parameters work differently. Example of default parameters for ES5:

function getData(params, toCache){
   if (typeof(toCache)==='undefined') toCache = true;
}

Your code is written on the ES6 and running, PhpStorm highlights.

Why PhpStorm is highlighting this as error in my JavaScript declaration

2 Answers2