Using ScaleTime on the X axis with d3 v4 in TypeScript for Angular2 on DefinitelyTyped

For my angular2 component, I am using the block provided in this link (a simple line chart): https://bl.ocks.org/d3noob/6f082f0e3b820b6bf68b78f2f7786084

I have successfully completed the following steps: npm install d3 --save npm install @types/d3 --save

To load d3.min.js and d3.node.js through SystemJS, I have included my component.ts file below.


// code is here

This excerpt from @types/d3-shape/index.d.ts covers the Line portion:


// line interface details are mentioned here

The graph is loading, but the line path is filled up.

Here's a plunker for reference: http://plnkr.co/edit/KwcgHsc7aPpE1tjv8mlb?p=preview

Question 1:

Why do I encounter these TypeScript errors?

error TS2339: Property 'x' does not exist on type '[number, number]'.

error TS2339: Property 'y' does not exist on type '[number, number]'.

Question 2:

Why isn't my :host(.timeline) style being applied?

javascriptangulartypescriptd3.jsdefinitelytyped

Answer №1

When working with d3.line, make sure to include the type parameter.

For instance, if your model interface is named Data:

interface Data {
   xValue: number;
   yValue: number;
}

Then, you can utilize:

d3.line<Data>()
    .x(d => scaleX(d.xValue))
    .y(d => scaleY(d.yValue));

This approach will address inquiry #1 effectively.

Answer №2

To solve the issue in question #2, it was necessary for me to specify that the ViewEncapsulation needed to be set to none within the Angular component.

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