`document.registerElement` error

[SilentGlasses]

Using this package with Pulsar and getting this error...

Use customElements.define instead of document.registerElement see https://javascript.info/custom-elements

HTMLDocument.registerElement - file:///Applications/Atom.app/Contents/Resources/app.asar/static/index.js:160:12

module.exports - /Users/bilbo/.atom/packages/pigments/node_modules/atom-utils/lib/register-or-update-element.js:65:31
Object.<anonymous> - /Users/bilbo/.atom/packages/pigments/lib/color-buffer-element.coffee:605:41
Object.<anonymous> - /Users/bilbo/.atom/packages/pigments/lib/color-buffer-element.coffee:607:4
Object.<anonymous> - /Users/bilbo/.atom/packages/pigments/lib/color-buffer-element.coffee:611:3
Module._compile - <embedded>:11:149913