HTMLElement.rootElement is deprecated.

[christopolise]

The contents of atom-text-editor elements are no longer encapsulated
within a shadow DOM boundary. Please, stop using rootElement and access
the editor contents directly instead.

HTMLElement.rootElement (/usr/share/atom/resources/app.asar/src/text-editor-element.js:23:10)
LoginView.initialize (/home/christopolise/.atom/packages/particle-dev/lib/views/login-view.js:65:87)
LoginView.constructor (/home/christopolise/.atom/packages/terminal-plus/node_modules/space-pen/lib/space-pen.js:184:25)
new LoginView (/home/christopolise/.atom/packages/particle-dev/lib/views/login-view.js:32:73)
Object.initView (/home/christopolise/.atom/packages/particle-dev/lib/main.js:303:16)
Object.login (/home/christopolise/.atom/packages/particle-dev/lib/main.js:624:8)