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What is the difference between npm install --force and npm install --legacy-peer-deps?

I am trying to install node_modules for a project using npm install. But it's failing.

Error Log :

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: my-first-app@0.0.0
npm ERR! Found: @angular/compiler@11.0.9
npm ERR! node_modules/@angular/compiler
npm ERR!   @angular/compiler@"~11.0.0" from the root project
npm ERR!   peer @angular/compiler@"11.0.9" from @angular/compiler-cli@11.0.9
npm ERR!   node_modules/@angular/compiler-cli
npm ERR!     dev @angular/compiler-cli@"~11.0.0" from the root project
npm ERR!     peer @angular/compiler-cli@"^11.0.0" from @angular-devkit/build-angular@0.1100.7
npm ERR!     node_modules/@angular-devkit/build-angular
npm ERR!       dev @angular-devkit/build-angular@"~0.1100.0" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer @angular/compiler@"11.1.2" from @angular/localize@11.1.2
npm ERR! node_modules/@angular/localize
npm ERR!   peerOptional @angular/localize@"^11.0.0" from @angular-devkit/build-angular@0.1100.7
npm ERR!   node_modules/@angular-devkit/build-angular
npm ERR!     dev @angular-devkit/build-angular@"~0.1100.0" 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 /Users/amit/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/amit/.npm/_logs/2021-02-04T17_58_24_981Z-debug.log

Logs suggest to use either npm install --force or npm install --legacy-peer-deps

I want to understand the basic difference between npm install --force and npm install --legacy-peer-deps.

Also, which one is more preferable to be used, just in case if performance of --force is better than --legacy-peer-deeps or vice-versa ?

Any suggestions/pointers are highly appreciable. Thanks!

over 4 years ago · Santiago Trujillo
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