Cannot find module '@angular-devkit/core'

Solution 1:

Try the following steps,

Step 1:

npm update -g @angular/cli

Step 2:

Edit your package.json changing the line

"@angular/cli": "1.6.0",

to

"@angular/cli": "^1.6.0",

STEP 3:

npm update

Refer the steps

Solution 2:

Step1: Edit your package.json changing the line

@angular/cli": "1.6.4"

to

@angular/cli": "^1.6.4"

Step2:

npm update -g @angular/cli 

Step3:

npm install --save-dev @angular/cli@latest

I was facing the exact same problem. These three did the tasks for me. You may like to see https://github.com/angular/angular-cli/issues/9307

Solution 3:

try this out

npm install @angular-devkit/core --save-dev

https://github.com/angular/devkit/issues/256

try to update your angular cli

https://github.com/angular/angular-cli/issues/9307

Solution 4:

This can happen on different versions on angular-cli. You can install it manually with

 npm i -D @angular-devkit/core 

-D is shortcut to --save-dev

Or try the latest version of angular cli

npm install --save-dev @angular/cli@latest

Solution 5:

package.json, change to "@angular/cli": "^1.6.5",

 "devDependencies": {
"@angular/cli": "^1.6.5",
"@angular/compiler-cli": "^5.0.0",

Important, the version could be vary depends on what time.

You really should run

 npm update -g @angular/cli 

first, to get version, my is 1.6.5

What does the "^" do?

 ~1.0.2 means to install version 1.0.2 or the latest patch version such as 1.0.4. 

  ^1.0.2 means to install version 1.0.2 or the latest minor or patch version such as 1.1.0.

last, run this

   npm update