Suggestion for setting up a Nodemailer transport configuration

I have a mail service class set up on an express server.

What is the recommended method for creating a transport?

class mailService {
    private transport: nodemailer.Transport;
    constructor(){
        this.transport = nodemailer.createTransport('configstring');
    }

    public sendEmail(email: string){
        //send email
    }
}

OR

class mailService {

    public sendEmail(email: string){
        let transporter = nodemailer.createTransport('configstring');
        //send email
    }

    public sendOtherEmail(email: string){
        let transporter = nodemailer.createTransport('configstring');
        //send email
    }
}

The documentation mentions "You can reuse a transport as often as you like after creating it," leading me to consider that the first option might be better, although I am unsure if there are any advantages to it.

Would repeatedly creating the transport be problematic due to repetition or could it result in multiple instances lingering in memory every time the sendEmail function is called?

Answer №1

Opting for the second approach does not offer much of an advantage. It may be useful if you need to adjust the transport settings for different email sending tasks.

However, unless you have a specific requirement for it, it is suggested to stick with using a single transport method (the first option) when sending emails in line with the DRY principle.

Furthermore, there is no need to worry about memory allocation since Node includes a garbage collector that will free up memory once your sendOtherEmail() function completes.

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