npm install err!

[gleke]

node v16.8.0

gleke@gleke-System-Product-Name:~/mattermost-plugin-demo/webapp$ npm install
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: webapp@undefined
npm ERR! Found: eslint@6.0.1
npm ERR! node_modules/eslint
npm ERR!   dev eslint@"6.0.1" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer eslint@"^5.0.0" from @typescript-eslint/parser@1.13.0
npm ERR! node_modules/@typescript-eslint/parser
npm ERR!   dev @typescript-eslint/parser@"1.13.0" from the root project
npm ERR!   peer @typescript-eslint/parser@"^1.9.0" from @typescript-eslint/eslint-plugin@1.13.0
npm ERR!   node_modules/@typescript-eslint/eslint-plugin
npm ERR!     dev @typescript-eslint/eslint-plugin@"1.13.0" 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.
npm ERR! 
npm ERR! See /home/gleke/.npm/eresolve-report.txt for a full report.

[hanzei]

Could you please test with node v14?

[Jassi10000-zz]

Simply update the node and npm version
And things will automatically get sorted