old_contents: export default {
    name: 'Treemap',
    props: [
      {
        name: 'width',
        type: 'Number',
        defaultVal: 'null',
        isOptional: false,
        desc: 'The width of chart container.',
      }, {
        name: 'height',
        type: 'Number',
        defaultVal: 'null',
        isOptional: false,
        desc: 'The width of chart container.',
      }, {
        name: 'margin',
        type: 'Object',
        defaultVal: '{ top: 5, right: 5, bottom: 5, left: 5 }',
        isOptional: true,
        desc: 'The sizes of whitespace around the container.',
      },
    ],
    examples: [
      {
        name: 'Simple AreaChart',
        url: '/examples#areaChart',
      }
    ]
  };
  
new_contents: export default {
    name: 'Treemap',
    props: [
      {
        name: 'width',
        type: 'Number',
        defaultVal: 'null',
        isOptional: false,
        desc: 'The width of chart container.',
      }, {
        name: 'height',
        type: 'Number',
        defaultVal: 'null',
        isOptional: false,
        desc: 'The width of chart container.',
      }, {
        name: 'ratio',
        type: 'Number',
        defaultVal: 'null',
        isOptional: false,
        desc: 'The ratio of every single rectangle in the treemap.',
      }, {
        name: 'margin',
        type: 'Object',
        defaultVal: '{ top: 5, right: 5, bottom: 5, left: 5 }',
        isOptional: true,
        desc: 'The sizes of whitespace around the container.',
      },
    ],
    examples: [
      {
        name: 'Simple AreaChart',
        url: '/examples#areaChart',
      }
    ]
  };
  
subject: add missing property ratio