Setting values for TypeScript objects

I am currently working on developing a custom visual using Power BI. Within my interfaces file, I have a TypeScript interface called BiHiSankey.

   declare module 'd3' {

    interface BiHiSankey {
          nodeSpacing: () => number;
          nodeWidth: () => number;
          collapsedNodes: () => d3.Selection<any>
                          }
    export var biHiSankey: () => BiHiSankey
                    }

In my visual.ts file, I have implemented the following:

let BiHi = d3.biHiSankey();
BiHi.nodeWidth(20);

However, when trying to assign a value to the nodeWidth using this method, I encounter an error stating, Expected 0 arguments, but got 1.

I am unsure as to why this issue is occurring. As someone who is new to TypeScript, could anyone provide assistance?

typescriptinterface

Answer №1

To properly handle both getting and setting the value, it is essential to declare separate overloads for each operation.

interface BiHiSankey {
    spacingBetweenNodes(): number;
    spacingBetweenNodes(value: number): void;
    nodeWidth(): number;
    nodeWidth(value: number): void;
}
let biHi = d3.biHiSankey();
biHi.nodeWidth(30); // set value
biHi.nodeWidth(); // get value

Note: It's crucial that the functions specified in JS support this dual functionality.

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