Class SpreadsheetTriggerBuilder

const sheet = SpreadsheetApp.getActive();
ScriptApp.newTrigger('myFunction').forSpreadsheet(sheet).onChange().create();

const sheet = SpreadsheetApp.getActive();
ScriptApp.newTrigger('myFunction').forSpreadsheet(sheet).onEdit().create();

const sheet = SpreadsheetApp.getActive();
ScriptApp.newTrigger('myFunction')
    .forSpreadsheet(sheet)
    .onFormSubmit()
    .create();

const sheet = SpreadsheetApp.getActive();
ScriptApp.newTrigger('myFunction').forSpreadsheet(sheet).onOpen().create();