different node version conflicts while npm install - node.js

Question

I got this issue everytime I want to do npx create-react-app my_app
yarn add v1.15.2
[1/4] 🔍 Resolving packages...
[2/4] 🚚 Fetching packages...
error eslint#6.2.1: The engine "node" is incompatible with this module.
Expected version "^8.10.0 || ^10.13.0 || >=11.10.1". Got "8.3.0"
But when I do check my versions with nvm and bash here's what I got
$ node -v
v8.16.1
$ npm -v
6.4.1
$ nvm ls
nvm ls
-> v8.16.1
v9.10.1
v12.0.0
system
default -> node (-> v12.0.0)
node -> stable (-> v12.0.0) (default)
stable -> 12.0 (-> v12.0.0) (default)
iojs -> N/A (default)
lts/* -> lts/dubnium (-> N/A)
lts/argon -> v4.9.1 (-> N/A)
lts/boron -> v6.17.1 (-> N/A)
lts/carbon -> v8.16.1
lts/dubnium -> v10.16.3 (-> N/A)
I really don't get why it says while doing the npx command that I got node 8.3.0 and that version appears nowhere
It may be because I've installed node with brew some times ago and it may conflict with nvm settings?
It works when I issue npm install -g create-react-app and create-react-app my-app separately as it's what facebook recommends for old node version
$ npm install -g create-react-app
+ create-react-app#3.1.1
added 91 packages from 45 contributors in 4.491s
$ create-react-app trainin
yarn add v1.15.2
[1/4] 🔍 Resolving packages...
[2/4] 🚚 Fetching packages...
[3/4] 🔗 Linking dependencies...
warning "react-scripts > #typescript-eslint/eslint-plugin#1.13.0" has incorrect peer dependency "eslint#^5.0.0".
warning "react-scripts > #typescript-eslint/parser#1.13.0" has incorrect peer dependency "eslint#^5.0.0".
warning "react-scripts > #typescript-eslint/eslint-plugin > tsutils#3.17.1" has unmet peer dependency "typescript#>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta".
[4/4] 🔨 Building fresh packages...
success Saved lockfile.
success Saved 7 new dependencies.
info Direct dependencies
├─ react-dom#16.9.0
├─ react-scripts#3.1.1
└─ react#16.9.0
info All dependencies
├─ eslint-config-react-app#5.0.1
├─ react-dev-utils#9.0.3
├─ react-dom#16.9.0
├─ react-error-overlay#6.0.1
├─ react-scripts#3.1.1
├─ react#16.9.0
└─ scheduler#0.15.0
✨ Done in 15.45s.

Answer 1

You'd better uninstall the version installed by brew, and setup the default version compatible with npx required.

Answer 2

You can use n package which allow you to switch between multiple node versions