Troubleshooting d3js Type Errors in Angular (Updated Version)

Encountering numerous type errors with d3js when integrating it into Angular (typescript).

svg.call(d3.zoom().on('zoom', () => {
      g.attr('transform', d3.events.transform);
    }));

Error thrown:

S2345: Argument of type 'ZoomBehavior<Element, unknown>' is not assignable to parameter of type '(selection: Selection<BaseType, unknown, HTMLElement, any>, ...args: any[]) => void'.   Incompatible types for parameters 'selection' and 'selection'. 

Additionally, encountering an error where d3.events is undefined.

Looking for guidance on resolving these issues? Many code samples are failing due to these type errors, even using @ts-ignore does not help.

UPDATE: Following the migration guide from v5 to v6 resolved the errors in the zoom handler:

const zoom = d3.zoom().on('zoom', ({transform}, d) => {
   g.attr('transform', transform);
});

However, the aforementioned type error persists when trying to call it in this manner:

svg.call(zoom)

Answer №1

Regarding the issue with 'd3.event is undefined':

If you encounter an error stating that 'd3.event' is undefined, even though it works fine when running the application, it may be due to using a mismatched version of the '@types/d3' package for d3 v6 while having d3 itself on version v5. This discrepancy is a result of changes introduced in d3 v6, including the removal of 'd3.event'.

You can check the versions of types available on the npm page, which closely correspond to d3 versions. The compatible one in this case would be

@types/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="85e1b6c5b0abb4b3abb1">[email protected]</a>
.

About the type mismatch error:

If the selection type is not explicitly defined, it defaults to

Selection<BaseType, unknown, HTMLElement, any>
. However, 'd3.zoom' default to
ZoomBehavior<Element, unknown>
, causing TypeScript to flag an incompatibility between 'BaseType' and 'Element'.

To resolve this, specify the generics for both svg selection and zoom:

const svg = d3.select<SVGSVGElement, unknown>(...);
const zoom = d3.zoom<SVGSVGElement, unknown>() [...];

svg.call(zoom);

The first line indicates selecting an SVGSVGElement (representing the <svg> element) with an 'unknown' datum type. The second line ensures the zoom function will operate on a selection of SVGSVGElement also featuring an 'unknown' datum type.

With matching generics for both zoom and svg, the '.call' method will now work seamlessly. Refer to this codesandbox demonstration for clarity.

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