I discovered this when accidentally specifying an app name that doesn't exist:
$ heroku repo:reset -a download-counts
Resetting Git repository for ⬢ download-counts... ⣯
â–¸ Unexpected token ! in JSON at position 1
$ heroku repo:reset -a npm-download-counts
Resetting Git repository for ⬢ npm-download-counts... done
👋
I discovered this when accidentally specifying an app name that doesn't exist: