Angular CLI gives me “TypeError: callbacks[i] is not a function” when I “ng serve”

Question

I literally just made a fresh installation of the Angular CLI in order to try it out and I don\'t have a clue on what\'s causing the following error on the command line:

Answer 1

Try this command -> npm install copy-webpack-plugin@4.3.0 resolved my issue

Answer 2

run this command npm install copy-webpack-plugin@4.3.0

Answer 3

if npm install copy-webpack-plugin@4.3.1 doesn`t help try add in package.json:

"optionalDependencies": { "copy-webpack-plugin": "4.3.1" }, "resolutions": { "copy-webpack-plugin": "4.3.1" }

Answer 4

callbacks[i](err, result); ^

TypeError: callbacks[i] is not a function

solution:- npm install copy-webpack-plugin@4.3.0

Answer 5

Try to uninstall and reinstall Angular CLI :

Global package:

npm uninstall -g @angular/cli npm cache clean if npm version is > 5 then usenpm cache verifyto avoid errors (or to avoid using --force) npm install -g @angular/cli@latest

Local project package:

rm -rf node_modules dist # use rmdir /S/Q node_modules dist in Windows Command Prompt; use rm -r -fo node_modules,dist in Windows PowerShell npm install --save-dev @angular/cli@latest npm install

Answer 6

EDIT: The issue is now fixed, so there is no need to use this workaround anymore.

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Solution (workaround) found here

Add "copy-webpack-plugin": "4.3.0" to your package.json

Thanks @neshkatrapati