Unable to downgrade Angular from version 6 to 5

问题

Recently (May 2018) newer stable version of angular has been released. I have migrated succesfully from version 5 to 6.

But for some reason I wanted to rollback to version 5. I have tried following commands:

npm uninstall -g @angular/cli

it uninstalled the latest version of angular-6.

npm cache clean --force

and then installed

npm install -g @angular/cli@1.7.4

But it gave this error

node version: 8.10.0

npm version: 6.0.0

回答1:

you have to update npm...please refer to screenshot...I've sucessfully downgraded angular 6 to angular 5...

回答2:

Same as the other answer, but this time only commands instead of a difficult to follow screenshot

I wanted to downgrade from 7.0.2 to 6.2.5

ng --version

npm uninstall -g @angular/cli
npm cache clean --force

npm install -g @angular/cli@6.2.5
ng --version

回答3:

run

npm i npm@latest -g

to update node package manager. then run again

npm install -g @angular/cli@1.7

回答4:

First run these three commands to check which version is installed currently:

node -v
npm -v
ng --version

Then to uninstall the cli:

npm uninstall -g @angular/cli 

To clean cache:

npm cache clean --force

Then install the version that you want (X.X.X):

npm install -g @angular/cli@6.2.5

To check the successfull update:

ng --version

来源：https://stackoverflow.com/questions/50268300/unable-to-downgrade-angular-from-version-6-to-5