Upgrade from angular 8.2 to angular 9 issue

Question

When Upgrading from angular 8.2 to angular 9 I got this error

An unhandled exception occurred: Cannot find module '@angular-devkit/schematics'

How can I overcome this error?

this is the used command:

ng update @angular/core @angular/cli --next

Well simply npm i --save-dev @angular-devkit/schematics before updating? — misha130, Nov 25 '19 at 09:33
if `@angular-devkit/schematics` only exists in `package-lock.json` than deleting this, node_modules and running npm update works — Andrew Allen, Feb 10 '20 at 09:24

score 2 · Accepted Answer · answered Nov 26 '19 at 07:40

2

I can overcome this issue when running this command before the update command

npm i --save-dev @angular-devkit/schematics

answered Nov 26 '19 at 07:40

narouz

score 2 · Answer 2 · answered Feb 07 '20 at 20:17

You should update all libraries inside your project. If you want to update libraries one by one, first identify them using the following command:

ng update

Next update the identified packages, for example:

ng update @angular/core @angular/cli

If you want to automatically update all, use the --all and --force switches with the ng udpate command as follows:

ng update --all --force

score 0 · Answer 3 · answered Feb 07 '20 at 10:31

If you are still looking for updation from angular 8 to 9, just do the following:

ng update @angular/core @angular/cli

If still some problems exists with dependencies or something else just force all to update:

ng update --all --force

check your angular version by using:

ng --version

3 Answers3