ember new --typescript fails to create a new project

[Alex]

I'm new to ember and trying to do my first project using typescript, so I try to create a new project with this command:

ember new testprj --typescript

But the operation fails with this error:

Installing packages... This might take a couple of minutes.
Command failed with exit code 1: npm install --save-dev --loglevel error ember-cli-typescript
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: prova-ts@0.0.0
npm ERR! Found: stylelint@15.4.0
npm ERR! node_modules/stylelint
npm ERR!   dev stylelint@"^15.4.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer stylelint@">= 11.x < 15" from stylelint-config-prettier@9.0.5
npm ERR! node_modules/stylelint-config-prettier
npm ERR!   dev stylelint-config-prettier@"^9.0.5" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

I also got a lot of this warnings but I don't know if they are relevant or not:

You passed the '--typescript' flag but there is no TypeScript blueprint available. A JavaScript blueprint will be generated instead.

Output from ember version --verbose && npm --version && yarn --version:

ember-cli: 4.12.0
node: 18.15.0
v8: 10.2.154.26-node.25
uv: 1.44.2
zlib: 1.2.13
brotli: 1.0.9
ares: 1.18.1
modules: 108
nghttp2: 1.51.0
napi: 8
llhttp: 6.0.10
uvwasi: 0.0.15
acorn: 8.8.2
simdutf: 3.1.0
undici: 5.20.0
openssl: 3.0.8+quic
cldr: 42.0
icu: 72.1
tz: 2022g
unicode: 15.0
ngtcp2: 0.8.1
nghttp3: 0.7.0
os: linux x64
9.6.4
1.22.19

[Bert De Block]

#10251 should fix this. We just need a new release I think.

[Jeldrik Hanschke]

@Polve I just run into the same situation. To unblock you until release is created you could do the following:

1. Create the project with Yarn by setting the --yarn flag additionally.
2. Remove stylelint-config-prettier from package.json of newly created project.
3. Delete yarn.lock
4. Remove --yarn flag in config/ember-cli-update.js
5. Run npx ember-cli-update --reset

Afterwards you will have a project using NPM. Steps 3-5 are only needed if you want to use NPM. If you are fine with Yarn you could ignore them.

[Jeldrik Hanschke]

Fix has been released as v4.12.1.