code: function getClass() {
    const type = NodeType.ClassType;
    const token = tokens[pos];
    const line = token.ln;
    const column = token.col;
    const content = [];
  
    // Skip `.`
    pos++;
  
    const childType = tokens[pos].class_child;
    if (childType === 1) content.push(getInterpolatedVariable());
    else content.push(getIdent());
  
    return newNode(type, content, line, column);
  }
docs: Get node with a class selector
  @returns {Array} `['class', ['ident', x]]` where x is a class's
  identifier (without `.`, e.g. `abc`).