TriggerSource

An enumeration denoting the source of the event that causes the trigger to fire.

To call an enum, you call its parent class, name, and property. For example, `
ScriptApp.TriggerSource.SPREADSHEETS`.

### Properties

| Property | Type | Description |
|---|---|---|
| `SPREADSHEETS` | `Enum` | Google Sheets causes the trigger to fire. |
| `CLOCK` | `Enum` | A time-driven event causes the trigger to fire. |
| `FORMS` | `Enum` | Google Forms causes the trigger to fire. |
| `DOCUMENTS` | `Enum` | Google Docs causes the trigger to fire. |
| `CALENDAR` | `Enum` | Google Calendar causes the trigger to fire. |