Cannot read property 'type' of undefined

[boushley]

I have had a problem running jsctags on underscore.js and backbone.js both of them reporting Cannot read property 'type' of undefined. The entire error looks like the following:

Cannot read property 'type' of undefined

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
TypeError: Cannot read property 'type' of undefined
    at Object.<anonymous> (/usr/local/lib/cfa2/jscfa.js:1168:12)
    at Object.recur (/usr/local/lib/cfa2/jscfa.js:578:41)
    at /usr/local/lib/cfa2/jscfa.js:588:13
    at Array.forEach (native)
    at Object._haskids (/usr/local/lib/cfa2/jscfa.js:586:8)
    at Object.recur (/usr/local/lib/cfa2/jscfa.js:578:41)
    at /usr/local/lib/cfa2/jscfa.js:588:13
    at Array.forEach (native)
    at Object._haskids (/usr/local/lib/cfa2/jscfa.js:586:8)
    at Object.recur (/usr/local/lib/cfa2/jscfa.js:578:41)

The error message didn't seem to point me towards the source of the error. However in both of these libraries I was able to track down the source of the error to the following.

In backbone.js:

  if (typeof exports !== 'undefined') {

and

  if (!_ && (typeof require !== 'undefined')) _ = require('underscore');

In underscore.js:

 if (typeof exports !== 'undefined') {
    if (typeof module !== 'undefined' && module.exports) {

It appears this method of checking if we are in node.js is causing problems.

Any suggested workaround for this?

[yhslai]

I have exactly the same issue! My node -v is v0.6.2

[tedeyang]

yes,me too!

[aslushnikov]

same thing for me; running node -v is v0.6.5

[ghost]

+1, running v.0.6.15

[clausreinke]

Could this be related to the second item in #23? It has been a long time, but looks the same.

In this case, an expected extra argument isn't passed, so p = arguments[3] isn't defined and p.type falls over (line 1168, as indicated in the stack trace). #23 works around by adding a guard p && p.type===STRING. This is just a workaround, not a fix, but might help.

[dimvar]

@boushley can you tell me which drjs commit you're using, and what options are you passing to jsctags.js?