destroy or something similar may come to the CLI, but it is not a primary focus at this time. So you will need to do this manually.
Delete the component directory (assuming you didn't use --flat) and then remove it from the NgModule in which it is declared.
If you are unsure of what to do, I suggest you have a "clean" app meaning no current git changes. Then generate a component and see what is changed in the repo so you can backtrack from there what you will need to do to delete a component.

`destroy` or something similar may come to the CLI, but it is not a primary focus at this time. So you will need to do this manually.
Delete the component directory (assuming you didn't use `--flat`) and then remove it from the `NgModule` in which it is declared.
If you are unsure of what to do, I suggest you have a "clean" app meaning no current `git` changes. Then generate a component and see what is changed in the repo so you can backtrack from there what you will need to do to delete a component.

Update ------
If you're just experimenting about what you want to generate, you can use the `--dry-run` flag to not produce any files on disk, just see the updated file list.