D3 Examples - Chord Diagram d3.v5 with self-wrapping text

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <style>
    body { position:absolute; top:0; bottom:0; right:0; left:0; }
    text { font-size:8px; font-family:monospace; }
    .chord { fill-opacity:0.4; }
    #title { font-size: 24px; opacity:0.6;}
  </style>
</head>
​
<body>
  
  <script src="https://d3js.org/d3.v5.min.js"></script>
    <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
  
  <script>
    
    // DIMENSIONS
    let height = 860,
        width = 1080;
    
    var outerRadius = height / 2,
        innerRadius = outerRadius - 148;
    
    // SVG
    var svg = d3.select("body").append("svg")
        .attr("height", height)
      .attr("width", width)
        .append("g")
            .attr("transform", "translate(" + outerRadius + "," + outerRadius + ")");
     
    // WRAPPED TITLE
    let title = svg.append("text")
        .attr("id", "title")
      .attr("x", -outerRadius + 26)
      .attr("y", -outerRadius)
    wrap("flare class dependencies", (width/4), title);
    
    // COLORS
    var fill = d3.scaleOrdinal(d3.schemeDark2);
        
    // FUNCTION EXPRESSIONS
    var chord = d3.chord()
        .padAngle(.06)
        .sortSubgroups(d3.descending)
        .sortChords(d3.descending);
​
    var ribbon = d3.ribbon()
        .radius(innerRadius)
    
    var arc = d3.arc()
        .innerRadius(innerRadius)
        .outerRadius(innerRadius + 20);
    
    // PULL IN DATA
    d3.json("origdata.json").then(draw,logErr);
    
    // MAIN FUNCTION
    function draw(data) {
 
      var indexByName = d3.map(),
          nameByIndex = d3.map(),
          matrix = [],
          n = 0;
​
      // Returns the Flare package name for the given class name.
      function name(name) {
        return name.substring(0, name.lastIndexOf(".")).substring(6);
      }
​
      // Compute a unique index for each package name.
      data.forEach(function(d) {
        if (!indexByName.has(d = name(d.name))) {
          nameByIndex.set(n, d);
          indexByName.set(d, n++);
        }
      });
  
      // Construct a square matrix counting package imports.
      data.forEach(function(d) {
        var source = indexByName.get(name(d.name)),
            row = matrix[source];
        if (!row) {
         row = matrix[source] = [];
         for (var i = -1; ++i < n;) row[i] = 0;
        }
        d.imports.forEach(function(d) { row[indexByName.get(name(d))]++; });
      });
      
      // CHORD GROUPS => ARCS
      let groups = svg.selectAll("g.group")
        .data(chord(matrix).groups)
        .enter().append("g")
          .classed("group", true);
      
      // Arcs
      groups.append("path")
        .style("fill", d => { return fill(d.index); })
        .style("stroke", d => { return fill(d.index); })
        .attr("d", arc);
​
      // Self-wrapping arc labels
      groups.append("text")
        .each(d => { d.angle = (d.startAngle + d.endAngle) / 2; })
        .attr("dy", ".35em")
        .attr("transform", function(d) { 
          return "rotate(" + (d.angle * 180 / Math.PI - 90) + ")" + "translate(" + (innerRadius + 26) + ")" + (d.angle > Math.PI ? "rotate(180)" : "");
        })
        .style("text-anchor", d => { return d.angle > Math.PI ? "end" : null; })    
        .each(d => { wrap(nameByIndex.get(d.index), innerRadius/3, d3.select(groups.selectAll("text").nodes()[d.index])); })
      //            .text(d => { return nameByIndex.get(d.index) })
         
      // CHORDS => RIBBONS
      let chords = svg.selectAll("path.chord")
          .data(chord(matrix))
        .enter().append("path")
          .classed("chord", true)
          .style("stroke", d => { return d3.rgb(fill(d.source.index)).darker(); })
          .style("fill", d => { return fill(d.source.index); })
            .attr("d", ribbon);
​
    } // end draw()
    
    // WRAP TEXT
    function wrap(text, width, parent) {
      let words = text.split(/\s/).reverse();
      if (words.length > 1) {
        let word,
          line = [],
          lineNumber = 0,
          lineHeight = 1, // ems
          x = getX(parent),
          y = getY(parent),
          dy = 1.6,
          tspan = parent.text(null).append("tspan").attr("x", x).attr("y", y).attr("dy", dy + "em");
        while (word = words.pop()) {
          line.push(word);
          tspan.text(line.join(" "));
          if (tspan.node().getComputedTextLength() > width) {
            line.pop();
            tspan.text(line.join(" "));
            line = [word];
            console.log(tspan)
            tspan = parent.append("tspan").attr("x", x).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word);
          }
        }
      } else {
        parent.text(text)
      }
      
      function getX(parent) {
        if (parent.attr("x")) {
          return parent.attr("x")
        } else if (parent.attr("angle")) {
          return innerRadius + 26
        } else {
          return 0
        }
      }
      function getY(parent) {
        if (parent.attr("y")) {
          return parent.attr("y")
        } else if (parent.attr("angle")) {
          if (d.angle > Math.PI) {
            return "rotate(180)"
          } else {
            return -26
          }
        } else {
          return ""
        }
      }
    }
    
    function logErr(error) {
      console.log(error)
    }
    
    d3.select(self.frameElement).style("height", outerRadius * 2 + "px");
    
  </script>
</body>
    