code.
<strong>SourceMaps</strong> are implemented in terms of <strong>LineMaps</strong>.

</p>

            </div>
            
            <div class="content"><div class='highlight'><pre><span class="class"><span class="keyword">class</span> <span class="title">LineMap</span></span>
  constructor: (<span class="property">@line</span>) -&gt;
    <span class="property">@columns</span> = []

  add: (column, [sourceLine, sourceColumn], options={}) -&gt;
    <span class="keyword">return</span> <span class="key