cannot determine the module for component angular 5

Check Case Sensitivity

import { MyComponent } from "./User/my-component";

In my case, the problem was that the folder user was created with U as capital in my import statement. But actually, on disk, it was in small-case. When I changed the pathname to user (with u lower case) in my import statement, it worked for me.

import { MyComponent } from "./user/my-component";

So check the case sensitivity, of your import path.