Function.extractParams is deprecated.

[lguariento]

Assigning custom properties to a marker when creating/copying it is
deprecated. Please, consider storing the custom properties you need in
some other object in your package, keyed by the marker's id property.

Function.extractParams (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/text-buffer/lib/marker.js:43:14)
MarkerLayer.markRange (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/text-buffer/lib/marker-layer.js:215:71)
DisplayMarkerLayer.markBufferRange (/Applications/Atom.app/Contents/Resources/app.asar/node_modules/text-buffer/lib/display-marker-layer.js:105:52)
TextEditor.markBufferRange (/Applications/Atom.app/Contents/Resources/app.asar/src/text-editor.js:1736:38)
Object.markInScopeVars (/Users/lg/.atom/packages/existdb/lib/existdb.coffee:464:33)
<unknown> (/Users/lg/.atom/packages/existdb/lib/existdb.coffee:118:26)

[duncdrum]

yup me too
exist-db 3.5.1
Java8
atom 1.20.1
macOS 10.11.6

[joewiz]

I'm seeing this warning too on the latest versions of all the above:

eXist-db 3.6.0 develop HEAD
Java 1.8.0_141
atom 1.21.0 x64
macOS 10.13