Cannot find package 'mem-fs' imported from

[chk4658]

Type of issue

npm install -g yo generator-code

and yo code failed

C:\Users\KHC1SZH\chenkai\Projects\vscodePluginsDemo>yo code
Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'mem-fs' imported from C:\Users\KHC1SZH\chenkai\node-v14.17.2-win-x64\node_global\node_modules\yo\node_modules\yeoman-environment\dist\environment-base.js
    at packageResolve (internal/modules/esm/resolve.js:650:9)
    at moduleResolve (internal/modules/esm/resolve.js:691:18)
    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:805:11)
    at Loader.resolve (internal/modules/esm/loader.js:88:40)
    at Loader.getModuleJob (internal/modules/esm/loader.js:241:28)
    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:72:40)
    at link (internal/modules/esm/module_job.js:71:36)

---

My environment

• OS version/details: eg. Windows 10 64-bit
• Node version: v14.17.2 (run node --version in your terminal)
• npm version: 6.14.13 (run npm --version in your terminal)
• Version of yo : 5.0.0 (run yo --version in your terminal)

Expected behavior

Need an upgrade for node? or downgrade yo. What should I do?

Current behavior

C:\Users\KHC1SZH\chenkai\Projects\vscodePluginsDemo>npm install -g mem-fs
npm WARN notsup Unsupported engine for mem-fs@4.0.0: wanted: {"node":">=18.0.0"} (current: {"node":"14.17.2","npm":"6.14.13"})
npm WARN notsup Not compatible with your version of node/npm: mem-fs@4.0.0

+ mem-fs@4.0.0
added 19 packages from 81 contributors in 1.872s

C:\Users\KHC1SZH\chenkai\Projects\vscodePluginsDemo>yo code
Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'stream' imported from C:\Users\KHC1SZH\chenkai\node-v14.17.2-win-x64\node_global\node_modules\mem-fs\dist\index.js
    at packageResolve (internal/modules/esm/resolve.js:650:9)
    at moduleResolve (internal/modules/esm/resolve.js:691:18)
    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:805:11)
    at Loader.resolve (internal/modules/esm/loader.js:88:40)
    at Loader.getModuleJob (internal/modules/esm/loader.js:241:28)
    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:72:40)
    at link (internal/modules/esm/module_job.js:71:36)

Steps to reproduce the behavior

Command line output

Paste your error output over here

[1071125093]

same

[1071125093]

stiff but fixed
1.need nvm, install node 20.5.0
2.reinstall yo generator-code

[filipboca]

Same for me, still does not work on 20.5

[atulbhatt-system32]

I am also facing the same issue

[mshima]

C:\Users\KHC1SZH\chenkai\Projects\vscodePluginsDemo>node --version v14.17.2

C:\Users\KHC1SZH\chenkai\Projects\vscodePluginsDemo>npm --version 6.14.13

yo@5 requires node 18 and npm should be at least v7, latest is recommended.

[atulbhatt-system32]

I tried with node -v (21.5.0) and npm -v (10.2.4) but what worked for me was downgrading yo to version 4.3.1

[atulbhatt-system32]

@mshima is node 18 the minimum requirement or greater also works for yo@5 as in my case it didn't.
node -v (21.5.0) and npm -v (10.2.4)

[mshima]

yo must be installed with newer npm (must support peer dependencies).

npm install -g npm@latest
npm uninstall -g yo generator-code
npm install -g yo generator-code
npm uninstall yo generator-code # make sure it’s not installed locally
yo code

[isMattCoding]

Playing with the npm and node versions didn't work for me.

It seems that this issue still persists, but what allowed me to continue was running:

npm install -g yo generator-code mem-fs
yo code

[erikJonsberg]

Playing with the npm and node versions didn't work for me.

It seems that this issue still persists, but what allowed me to continue was running:

npm install -g yo generator-code mem-fs
yo code

This worked for me as well. However, I need to reinstall mem-fs globally each time I run yo code. Does anyone know why? It should already be installed, right?

[schroeder-g]

Playing with the npm and node versions didn't work for me.
It seems that this issue still persists, but what allowed me to continue was running:

npm install -g yo generator-code mem-fs
yo code

This worked for me as well. However, I need to reinstall mem-fs globally each time I run yo code. Does anyone know why? It should already be installed, right?

The above alone didn't resolve the issue for me. The fix that I found was to:

0. Uninstall all the relevant packages, nvm use v20.14.0, npm install -g yo generator-code mem-fs
1. navigate to the install location for yeoman indicated in the error: code /path/to/node_modules/yeoman-generator
2. npm install mem-fs
3. npm run build to recompile dist with tsc.
4. yo > choose generator.

Hilariously, there's no tsconfig.json in the project, so the build step resulted in me transpiling all TypeScript files in my home directory. Would recommend just copying theirs into the project root to avoid this issue.

[wesleyscholl]

npm install -g yo generator-code mem-fs

This worked for me, thanks!