Change value key in content array from content to value

[mullwaden]

Recently had issues with this. Turns out sendgrid uses 'value' instead of 'content' in the content array to store values. In addition the require the content array to be a specific order (text, html, ...others). This fixes that.

Stumbled upon this issue while trying to make inline ical events for outlook.

Error from sendgrid:

  The content value must be a string at least one character in length.
    content.0.value
    http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.content.value
  The content value must be a string at least one character in length.
    content.1.value
    http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.content.value
  The content value must be a string at least one character in length.
    content.2.value
    http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.content.value

Some sendgrid documentation: https://github.com/sendgrid/sendgrid-nodejs/blob/master/docs/use-cases/manual-content.md

If some poor soul out there is fighting outlook, this is how i added the events to nodemailer + sendgrid:

    icalEvent: {
      // need to base64 encode for sendgrid to be happy
      content: Buffer.from(calendarEventString).toString("base64"),
      filename: "invite.ics",
      method,
      encoding: "base64",
    },
    alternatives: [
      {
        // ical-generator adds line breaks (correctly) to the attachment. But quoted-printable
        // encoding which is applied to the inline event adds its own line breaks. So we remove these
        // and let sendgrid do the work
        content: calendarEventString.replace(/(\r\n )/g, ""),
        contentType: `text/calendar; method=${method}`,
      },
    ],