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

Edit

Just execute yarn upgrade.

There was a release of copy_webpack_plugin fixing the bug (4.4.1), so this should be preferred for resolving this issue. With npm, npm --depth 9999 update should do the trick to update all dependencies recursively.

Regarding the depth argument for npm update:

As of npm@2.6.1, the npm update will only inspect top-level packages. Prior versions of npm would also recursively inspect all dependencies. To get the old behavior, use npm --depth 9999 update

Original answer below:

Solution

rm -rf node_modules package-lock.json
npm i copy-webpack-plugin@4.3.1 -E -O
npm i

Explanation:

• We remove node_modules and lockfile
• We specify copy_webpack_plugin only as a peer dependency (option -O) and with an exact version (option -E)
• We install node_modules