code: function getInterpolatedVariable() {
    const type = NodeType.InterpolatedVariableType;
    const token = tokens[pos];
    const line = token.ln;
    const column = token.col;
    const content = [];
  
    // Skip `@{`:
    pos += 2;
  
    content.push(getIdent());
  
    const end = getLastPosition(content, line, column, 1);
  
    // Skip `}`:
    pos++;
  
    return newNode(type, content, line, column, end);
  }
docs: Get node with LESS interpolated variable
  @returns {Array} `['interpolatedVariable', x]`