docs: function formatSymbolExport(symbol, namespaces, imports) {
    const name = symbol.name;
    const parts = name.split('~');
    const isNamed = parts[0].indexOf('.') !== -1;
    const nsParts = parts[0].replace(/^module\:/, '').split(/[\/\.]/);
    const last = nsParts.length - 1;
    const importName = isNamed ?
      '_' + nsParts.slice(0, last).join('_') + '$' + nsParts[last] :
      '$' + nsParts.join('$');
    let line = nsParts[0];
    for (let i = 1, ii = nsParts.length; i < ii; ++i) {
      line += `.${nsParts[i]}`;
      namespaces[line] = (line in namespaces ? namespaces[line] : true) && i < ii - 1;
    }
    line += ` = ${importName};`;
    imports[getImport(symbol, nsParts.pop())] = true;
    return line;
  }