Solving the challenge of D3 stack area with TypeScript in Angular

When attempting to create a stacked area chart in TypeScript using the provided code snippet at this link, I encountered an issue with how the stacks are being rendered. Instead of overlapping, they all appear to start from the y-axis' 0 point and are not ordered correctly. I suspect that this problem may be related to 

D3.stack()(<any>newDataset);
being in an incorrect format.

If I remove the type "any," I receive the following error:

Argument of type '{ x: any; y: any; y0: number; }[][]' is not assignable to parameter of type '{ [key: string]: number; }[]'.
  Type '{ x: any; y: any; y0: number; }[]' is not assignable to type '{ [key: string]: number; }'.
    Index signature is missing in type '{ x: any; y: any; y0: number; }[]'.

Below is my code snippet:

ngAfterViewInit() {
    this.createChart();
  }

  getStackedData() {
    const dataset = [
      { year: 1, age1: 31, age2: 10, age3: 32, age4: 27 },
      { year: 2, age1: 32, age2: 12, age3: 30, age4: 26 },
      ...
      // Additional dataset entries omitted for brevity
    ];
    return dataset;
  }

  // Rest of the original code remains unchanged...
angulartypescriptd3.js

Answer №1

Transition from version 3 to version 4 has brought changes to stacking. While the exact workings of the old version remain uncertain, the new approach eliminates the need for the 

const newDataset = ['age1', 'age2', 'age3', 'age4'].map( ... )
section, replacing it with specifying the keys array for the stack generator.

Upon stacking, all data is organized into arrays, with the d in the area generator containing a 2D array consisting of y0 and y1 values. For the x value, accessing the data property within d allows you to retrieve the necessary information.

const dataset = [{
    year: 1,
    age1: 31,
    age2: 10,
    age3: 32,
    age4: 27
  },
  {
    year: 2,
    age1: 32,
    age2: 12,
    age3: 30,
    age4: 26
  },
  ...
];

const chartHeight = 200,
  chartWidth = 200;

const yScale = d3.scaleLinear()
  .range([chartHeight, 0])
  .domain([0, 100]);
  
...
...
...

ageGroup.append('path')
  .attr('d', function(d) {
    return area(d);
  });
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<div id="chart1"></div>

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