CODEWITHSUNDEEP
javascriptnode.jsnpmnode-modulesnpm-install
mgbolts
mgbolts

Reputation: 21

Imported Node Module - Error: Cannot find module

I am trying to modify this existing npm package without much success. I have wasted several hours troubleshooting would appreciate some guidance.

https://www.npmjs.com/package/dxf

I have forked the package into my Github account. I have then used npm to install the module locally (W10 running latest LTS Node).

npm i https://github.com/mgbolts/dxf

It installs with no errors but when I require it in my app, I get this error:

Error: Cannot find module 'S:\mgbolts\coding\Udemy\Nodejs\projects\plasma\node_modules\dxf\lib\index.js'. 

Please verify that the package.json has a valid "main" entry

Looking in the dxf module folder, there is no lib subdirectory and the index.js file is located in the src subdirectory. I have modified the package.json file in the dxf package folder to reflect this. After this edit, I now get this error:

S:\mgbolts\coding\Udemy\Nodejs\projects\plasma\node_modules\dxf\src\index.js:1
import config from './config'

SyntaxError: Cannot use import statement outside a module
    at Object.compileFunction (node:vm:352:18)
    at wrapSafe (node:internal/modules/cjs/loader:1031:15)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (S:\mgbolts\coding\Udemy\Nodejs\projects\plasma\src\index.js:2:13)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)

I have then tried adding adding a new entry ("type": "module") to the package.json file in the module folder. After that I get this error:

S:\mgbolts\coding\Udemy\Nodejs\projects\plasma\src\index.js:2
const dxf = require('dxf')
            ^
Error [ERR_REQUIRE_ESM]: require() of ES Module S:\mgbolts\coding\Udemy\Nodejs\projects\plasma\node_modules\dxf\src\index.js from S:\mgbolts\coding\Udemy\Nodejs\projects\plasma\src\index.js not supported.

My code is very simple to solve this issue, just a simple const dxf = require('dxf').

Here is an extract of the package.json file as with the two edits mentioned above:

  "name": "dxf",
  "version": "4.6.1",
  "description": "DXF parser for node/browser",
  "main": "src/index.js",
  "type": "module",
  "bin": {
    "dxf-to-svg": "src/cli.js"
  }

Upvotes: 0

Views: 4023

Answers (2)

capdev
capdev

Reputation: 1

I had same error like:

Error: Cannot find module '/home/User/Dir/Dir/node_modules/section-matter/index.js'. Please verify that the package.json has a valid "main" entry

Solution for me:

npm i section-matter

that will install the required dependency. For me it was fortunately only one package. Otherwise, the name of the package must be read from the error and possibly adjusted.

Upvotes: 0

mgbolts
mgbolts

Reputation: 21

The matter has been resolved. I did not realise that you needed to compile the package when installing from github. Not something required when installing from NPM registry.

The module's package.json file has a script to run the compile process script.
npm run prepublishOnly

Took a little while to install the dependencies (browserify, babel, rimraf) but it compiled and now works...

Upvotes: 0

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