An enumeration denoting the type of triggered event.
To call an enum, you call its parent class, name, and property. For example,
|The trigger fires once the time-driven event reaches a specific time.
|The trigger fires once the user opens the Google Docs, Sheets, or Forms file.
|The trigger fires once the user edits the Google Sheets file (for example, by entering a new value into a cell, which counts as an edit instead of a change).
|The trigger fires once the user responds to a Google Form. This trigger is available either in the Google Form itself or in the Google Sheets file that the form sends its responses to.
|The trigger fires once the user changes the Google Sheets file (for example, by adding a row, which counts as a change instead of an edit).
|The trigger fires once an event gets created, updated, or deleted on the specified Google Calendar.