Function onVisitLine

frontend/contentlayer.config.js:91–95

(node)

        {
          theme: "github-dark",
          onVisitLine(node) {
            if (node.children.length === 0) {
              node.children = [{ type: "text", value: " " }]
            }
          },
          onVisitHighlightedLine(node) {
            node.properties.className.push("line--highlighted")
          },