Updating an N1/Nylas Mail theme for Mailspring

Mailspring is similar to Nylas Mail, but the entire package manager has been replaced to improve performance. Themes work almost the same way, but there are a few changes you’ll need to make to ensure your theme works well in Mailspring. These changes are mostly minor - this should only take a few minutes!

  1. Open the theme’s package.json file. Replace this section:
"engines": {
  "nylas": "*"
},

…with…

"engines": {
  "mailspring": "*"
},

If your theme only works on specific versions of Mailspring, this is where you’d specify the version constraint (eg >=1.0.2)