@cookshack/codemirror-blank-lines

CodeMirror 6 extension for styling blank lines.

Adds CSS class cm-blank-line to zero length lines.

Options

Name	Default
includeActiveLine	false	Whether to style the active line.

Use

let text = []
for (let i = 1; i <= 100; i++)
  text.push((i % 5 == 0) ? "line " + i : "")

window.view = new EditorView({
  extensions: [ blankLines({ includeActiveLine: true }) ],
  doc: text.join("\n"),
  parent: document.querySelector("#editor")
})

Then style with CSS.

div.cm-line.cm-blank-line {
  background: lightyellow;
  /* works, but will mess up alignment of gutter line numbers */
  line-height: 0.9;
}

Build from source

$ npm i # only needed first time
$ npm run prepare