Upgrade Angular - Two or more projects are using identical root warning

Question

For updating Angular 8 to 9, I am following the official document to upgrade.

Which suggests first updating to the latest version of angular 8, like:

ng update @angular/core@8 @angular/cli@8

However, I am getting three warnings (all the same):

npm WARN notsup Unsupported engine for [email protected]: wanted: {"node":"<8.10.0"} (current: {"node":"12.16.1","npm":"6.13.4"})
npm WARN notsup Not compatible with your version of node/npm: [email protected]
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@~2.1.2 (node_modules\watchpack\node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN [email protected] requires a peer of @angular/common@^6.0.0-rc.0 || ^6.0.0 || ^7.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of @angular/core@^6.0.0-rc.0 || ^6.0.0 || ^7.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

added 369 packages from 99 contributors, removed 29 packages, updated 172 packages, moved 2 packages and audited 1664 packages in 109.259s

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found 873 vulnerabilities (639 low, 6 moderate, 227 high, 1 critical)
  run `npm audit fix` to fix them, or `npm audit` for details
Two or more projects are using identical roots. Unable to determine project using current working directory. Using default workspace project instead.
Two or more projects are using identical roots. Unable to determine project using current working directory. Using default workspace project instead.
Two or more projects are using identical roots. Unable to determine project using current working directory. Using default workspace project instead.

Answer 1

specify the root property of second project to e2e in angular.json file

change this:

"myproject-e2e": {
  "root": ""
 }

to

"myproject-e2e": {
  "root": "e2e",

Answer 2

In my case the following line was underlined and I removed it. It worked for me. If you have it in your project, you can try it..

{  ...
  "styleext": "scss",
   ...
{