Google Apps Script API
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    interface AttachmentsCollection {
        get(
            itemId: string,
            attachmentId: string,
        ): GoogleAppsScript.Mirror.Schema.Attachment;
        insert(itemId: string): GoogleAppsScript.Mirror.Schema.Attachment;
        insert(
            itemId: string,
            mediaData: any,
        ): GoogleAppsScript.Mirror.Schema.Attachment;
        list(itemId: string): AttachmentsListResponse;
        remove(itemId: string, attachmentId: string): void;
    }
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