'update user permissions of a google sheet using app script

I have a google sheet and i need to update the user permissions as below

Add [email protected] to sheet and give editor access (working with below code )

Drive.Permissions.insert(
   {
     'role': 'writer',
     'type': 'user',
     'value': '[email protected]'
   },
   sourceFileId,
   {
     'sendNotificationEmails': 'false'
   });

For all the users emails apart from [email protected], I need to make them just viewer access

Step -2 Im not able to achieve , please help me.Thanks

google-apps-script google-sheets

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'update user permissions of a google sheet using app script

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