Impossible to install @angular-devkit/build-angular ~0.1102.13 on npm7 #20888
Description
🐞 Bug report
Command (mark with an x)
- new
- build
- serve
- test
- e2e
- generate
- add
- update
- lint
- extract-i18n
- run
- config
- help
- version
- doc
Is this a regression?
Yes, the previous version in which this bug was not present was: 0.1102.10Description
It's impossible to install @angular-devkit/build-angular ~0.1102.13 if using npm7
It uses postcss 8.2.14, but also cssnano 5.0.2, which uses cssnano-preset-default@5.1.0, which has a peer dependency to postcss@"^8.2.15", so npm 7 fails to install because of peer dependency mismatch
🔬 Minimal Reproduction
mkdir justatest
cd justatest
npm init
npm install @angular-devkit/build-angular@~0.1102.13
🔥 Exception or Error
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! Found: postcss@8.2.14
npm ERR! node_modules/postcss
npm ERR! postcss@"8.2.14" from @angular-devkit/build-angular@0.1102.13
npm ERR! node_modules/@angular-devkit/build-angular
npm ERR! @angular-devkit/build-angular@"~0.1102.13" from the root project
npm ERR! peer postcss@"^8.1.0" from autoprefixer@10.2.4
npm ERR! node_modules/autoprefixer
npm ERR! autoprefixer@"10.2.4" from @angular-devkit/build-angular@0.1102.13
npm ERR! node_modules/@angular-devkit/build-angular
npm ERR! @angular-devkit/build-angular@"~0.1102.13" from the root project
npm ERR! 9 more (css-loader, cssnano, postcss-import, postcss-loader, ...)
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer postcss@"^8.2.15" from cssnano-preset-default@5.1.0
npm ERR! node_modules/cssnano/node_modules/cssnano-preset-default
npm ERR! cssnano-preset-default@"^5.0.1" from cssnano@5.0.2
npm ERR! node_modules/cssnano
npm ERR! cssnano@"5.0.2" from @angular-devkit/build-angular@0.1102.13
npm ERR! node_modules/@angular-devkit/build-angular
npm ERR! @angular-devkit/build-angular@"~0.1102.13" 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.
🌍 Your Environment
no need to use ng command, it fails if you just try to install the package
npm 7
Anything else relevant?
possible solution is to update the postcss dependency to 8.2.15, our use ~8.2.15 so it doesn't break again anytime soon