refactor(@angular/build): move postcss stylesheet processor to an optional peer dependency #27561
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The Postcss stylesheet processor is now an optional peer dependency of the newly introduced
@angular/build
build system package. This change removes the need for the package to have a direct dependency on thepostcss
package and allows some version customization of the optionalpostcss
package if needed. Postcss plugins (including Tailwind) are still fully supported but usage will now require installing thepostcss
package within the Angular workspace. An error with instructions to install the package will be generated during a build if the package is not present. This change only affects direct usage of the new@angular/build
package. The@angular-devkit/build-angular
package which is currently used for all existing projects will continue to contain and directly depend on thepostcss
package.No changes are required for existing applications.