"Successfully installed dependencies" despite failing to install eslint on an outdated node

I tried the new CLI on a slightly outdated version of node 18(.15)

It picked a version of eslint, which apparently requires node >=18.18, but still reported "Successfully installed dependencies", which was slightly confusing.

$ npx sv create sv-test
┌  Welcome to the Svelte CLI! (v0.5.9)
│
◇  Which template would you like?
│  SvelteKit minimal
│
◇  Add type checking with Typescript?
│  Yes, using Typescript syntax
│
◆  Project created
│
◇  What would you like to add to your project? (use arrow keys / space bar)
│  prettier, eslint, vitest
│
◇  Which package manager do you want to install dependencies with?
│  npm
│
◆  Successfully setup integrations
│
◇  Successfully installed dependencies
│
◇  Successfully formatted modified files
│
◇  Project next steps ─────────────────────────────────────────────────────╮
│                                                                          │
│  1: cd sv-test                                                           │
│  2: git init && git add -A && git commit -m "Initial commit" (optional)  │
│  3: npm run dev -- --open                                                │
│                                                                          │
│  To close the dev server, hit Ctrl-C                                     │
│                                                                          │
│  Stuck? Visit us at https://svelte.dev/chat                              │
│                                                                          │
├──────────────────────────────────────────────────────────────────────────╯
│
└  You're all set!

When I tried to use the installed template:

$ cd sv-test/
$ npm run test:unit

> sv-test@0.0.1 test:unit
> vitest

sh: line 1: vitest: command not found
$ npm run dev

> sv-test@0.0.1 dev
> vite dev

sh: line 1: vite: command not found

The actual problem is indicated when running npm install manually:

$ npm install
npm ERR! code EBADENGINE
npm ERR! engine Unsupported engine
npm ERR! engine Not compatible with your version of node/npm: eslint@9.13.0
npm ERR! notsup Not compatible with your version of node/npm: eslint@9.13.0
npm ERR! notsup Required: {"node":"^18.18.0 || ^20.9.0 || >=21.1.0"}
npm ERR! notsup Actual:   {"npm":"9.5.0","node":"v18.15.0"}

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/nickolay/.npm/_logs/2024-10-27T21_34_48_908Z-debug-0.log

sveltejs / cli

"Successfully installed dependencies" despite failing to install eslint on an outdated node #227