Use this dialog box to configure content roots of a project.
Add Content Root
Click this button and select a new content root folder in the dialog that opens.
Remove Content Entry
Click this button to have the selected root removed from the list.
Click this button to mark the selected folder as a test root.
Click this button to mark the selected folder as excluded so WebStorm ignores it during indexing, parsing, and code completion.
Click this button to enable WebStorm to complete relative paths to resources under the selected folder.
In this field, type the masks that define the names of files and folders to be excluded, for example,