[bug]: NextJS Monorepo install failing

[lelandcope]

Describe the bug

When running npx shadcn@canary init and selecting Next.js (Monorepo) I get the following error

Affected component/components

The initial installation

How to reproduce

1. Run npx shadcn@latest init
2. Select Next.js (Monorepo)

Codesandbox/StackBlitz link

No response

Logs

0 verbose cli /Users/lelandcope/.nvm/versions/node/v20.10.0/bin/node /Users/lelandcope/.nvm/versions/node/v20.10.0/bin/npm
1 info using [email protected]
2 info using [email protected]
3 timing npm:load:whichnode Completed in 1ms
4 timing config:load:defaults Completed in 0ms
5 timing config:load:file:/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/npmrc Completed in 0ms
6 timing config:load:builtin Completed in 1ms
7 timing config:load:cli Completed in 1ms
8 timing config:load:env Completed in 0ms
9 timing config:load:file:/Users/lelandcope/projects/my-app/.npmrc Completed in 1ms
10 timing config:load:project Completed in 2ms
11 timing config:load:file:/Users/lelandcope/.npmrc Completed in 0ms
12 timing config:load:user Completed in 0ms
13 timing config:load:file:/Users/lelandcope/.nvm/versions/node/v20.10.0/etc/npmrc Completed in 0ms
14 timing config:load:global Completed in 0ms
15 timing config:load:setEnvs Completed in 0ms
16 timing config:load Completed in 5ms
17 timing npm:load:configload Completed in 5ms
18 timing config:load:flatten Completed in 1ms
19 timing npm:load:mkdirpcache Completed in 0ms
20 timing npm:load:mkdirplogs Completed in 0ms
21 verbose title npm install
22 verbose argv "install"
23 timing npm:load:setTitle Completed in 5ms
24 timing npm:load:display Completed in 1ms
25 verbose logfile logs-max:10 dir:/Users/lelandcope/.npm/_logs/2025-04-08T23_29_04_737Z-
26 verbose logfile /Users/lelandcope/.npm/_logs/2025-04-08T23_29_04_737Z-debug-0.log
27 timing npm:load:logFile Completed in 3ms
28 timing npm:load:timers Completed in 0ms
29 timing npm:load:configScope Completed in 0ms
30 timing npm:load Completed in 19ms
31 timing arborist:ctor Completed in 0ms
32 silly logfile start cleaning logs, removing 1 files
33 silly logfile done cleaning log files
34 timing arborist:ctor Completed in 0ms
35 timing idealTree:init Completed in 4ms
36 timing idealTree:userRequests Completed in 0ms
37 silly idealTree buildDeps
38 timing idealTree Completed in 5ms
39 timing command:install Completed in 9ms
40 verbose stack Error: Unsupported URL Type "workspace:": workspace:*
40 verbose stack     at unsupportedURLType (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/npm-package-arg/lib/npa.js:310:15)
40 verbose stack     at fromURL (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/npm-package-arg/lib/npa.js:367:13)
40 verbose stack     at Function.resolve (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/npm-package-arg/lib/npa.js:83:12)
40 verbose stack     at #nodeFromEdge (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1048:22)
40 verbose stack     at #buildDepStep (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:917:35)
40 verbose stack     at #buildDeps (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:769:30)
40 verbose stack     at Arborist.buildIdealTree (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:196:28)
40 verbose stack     at async Promise.all (index 1)
40 verbose stack     at async Arborist.reify (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:159:5)
40 verbose stack     at async Install.exec (/Users/lelandcope/.nvm/versions/node/v20.10.0/lib/node_modules/npm/lib/commands/install.js:152:5)
41 verbose cwd /Users/lelandcope/projects/my-app
42 verbose Darwin 24.3.0
43 verbose node v20.10.0
44 verbose npm  v10.2.3
45 error code EUNSUPPORTEDPROTOCOL
46 error Unsupported URL Type "workspace:": workspace:*
47 verbose exit 1
48 timing npm Completed in 107ms
49 verbose unfinished npm timer reify 1744154944835
50 verbose unfinished npm timer reify:loadTrees 1744154944837
51 verbose unfinished npm timer idealTree:buildDeps 1744154944842
52 verbose unfinished npm timer idealTree:#root 1744154944842
53 verbose code 1
54 error A complete log of this run can be found in: /Users/lelandcope/.npm/_logs/2025-04-08T23_29_04_737Z-debug-0.log

System Info

Node v20
Mac OS 15.3.2

Before submitting

• I've made research efforts and searched the documentation
• I've searched for existing issues

[vsDizzy]

Have you tried to run canary instead?

npx shadcn@canary init

For me it worked with pnpm

pnpm dlx shadcn@canary init
Packages: +220
++++++++++++++++++++++++++++++++++++
Progress: resolved 220, reused 131, downloaded 89, added 220, done
√ The path D:\dev\next-app does not contain a package.json file.
  Would you like to start a new project? » Next.js (Monorepo)
√ What is your project named? ... my-app
√ Creating a new Next.js monorepo.
Success! Project initialization completed.
You may now add components.

[lelandcope]

@vsDizzy Whoops that was a typo in the above. I was using npx shadcn@canary init.

To me what it looks like is happening is it setting pnpn workspaces for npm workspaces.