ES6 port of famous mbostock's word wrap for d3 SVG text label

ES6 d3 word wrap

// ES6 port of famous mbostock's word wrap https://bl.ocks.org/mbostock/7555321

export function wrap(_text, width, lineHeightEm = 1.1) {
  _text.each(function () {
    const text = select(this)
    const words = text.text().split(/\s+/).reverse()
    const y = text.attr('y')
    const dy = parseFloat(text.attr('dy')) || 0
    let tspan = text.text(null).append('tspan').attr('x', 0).attr('y', y).attr('dy', dy + 'em')
    let line = []
    while (true) {
      const word = words.pop()
      if (!word) break
      line.push(word)
      tspan.text(line.join(' '))
      if (tspan.node().getComputedTextLength() > width) {
        line.pop()
        tspan.text(line.join(' '))
        line = [word]
        tspan = text.append('tspan')
          .attr('x', 0)
          .attr('y', y)
          .attr('dy', lineHeightEm + 'em')
          .text(word)
      }
    }
  })
}