Struggling to troubleshoot node.js "Unable to locate module xyz/abcd"

I'm encountering the error message 

Error: Cannot find module xyz/abcd
.

Yes, I have confirmed that the required module is indeed installed.

Based on the information provided in the pseudo-code of module.require, it should be functioning correctly.

I've attempted to investigate further by delving into the require() function to figure out why my file cannot be located. However, my node debugger does not seem to step into require(). Additionally, I've tried using the strace / grep NOENT method without any luck.

Does anyone have suggestions on how to troubleshoot this persistent require() failure?

Just to clarify, the error is originating from a file node_modules/xyz/a attempting to require xyz/b. According to the documentation, this should be working as expected.

node.jsmodulerequire

Answer №1

After some thorough investigation, I stumbled upon a valuable technique :

export NODE_DEBUG=module
node my_script.js

This method revealed some intriguing traces:

looking for "/(...)/tests_init.js" in ["/home/(me)/.nave/installed/0.10.24/lib/node","/home/(me)/.node_modules","/home/(me)/.node_libraries","/home/(me)/.nave/installed/0.10.24/lib/node"]

Interestingly, it became apparent that node was searching in unexpected locations. This called for further investigation...

[edit] conclusion of the situation:

1) It came to light that node does not handle modules installed with npm link effectively. The use of require(...) sometimes results in failures when attempting to access files within an npm-linked module. Rather than delving into the specifics of these error conditions, I shall simply state that npm link proves to be quite fragile.

2) A cautionary note: be vigilant of node's search for node_modules directories even within parent directories of the current working directory! Modules from higher-level folders of my application were occasionally selected!

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