I am trying to modify this existing npm package without much success. I have wasted several hours trouble shooting 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, their is no lib sub directory and the index.js file is located in the src sub directory. 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. (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"

CodePudding user response：

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...