How do I know where on disk a module is being loaded from?

Question

I have a module @vendorname/functions that does not exist on the filesystem according to npm list

$ npm ls @vendorname/functions
serverless-commerce@1.0.0 C:\Users\mikem\OneDrive\Documents\myapp\myapp
`-- (empty)

It also does not exist according to a demo file:

$ node
> require("@vendorname/functions")
{ Error: Cannot find module '@vendorname/functions'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:580:15)
    at Function.Module._load (internal/modules/cjs/loader.js:506:25)
    at Module.require (internal/modules/cjs/loader.js:636:17)
    at require (internal/modules/cjs/helpers.js:20:18) code: 'MODULE_NOT_FOUND' }

However I have a piece of software in the parent folder C:\Users\mikem\OneDrive\Documents\myapp\myapp that uses the module and it works:

let vendornameFunctions = require("@vendorname/functions"),

log(`>>> MYSTERY FILE IS BEING IMPORTED ${JSON.dumps(vendornameFunctions, null, 2)}`);

Returns:

>>> MYSTERY FILE IS BEING IMPORTED {
    "events": {},
    "queues": {},
    "tables": {},
    "html": {},
    "json": {},
    "css": {},
    "js": {},
    "text": {},
    "xml": {}
}

I can reliably replicate this behavior. How can I determine where on disk the module is being loaded from?

Answer 1

You can use require.resolve to get the path to the module.

console.log(require.resolve("@vendorname/functions"));