typing of Color is incorrect in ColorHelper constructor

Describe the bug

in version 18 the following code worked:

this.data = ['No Data'];
this.colors = new ColorHelper({ domain: ['#ccc'] }, ScaleType.Ordinal, this.data, null);

 <ngx-charts-legend
    [data]="data"
    [colors]="colors!"
...

in v19 the compiler now complains

error TS2345: Argument of type '{ domain: string[]; }' is not assignable to parameter of type 'string | Color'.
  Type '{ domain: string[]; }' is missing the following properties from type 'Color': name, selectable, group

reviewing code for ColorHelper, none of the other properties matter. It appears that there are a set of default schemes named in color-sets.ts and on those objects, the name member is also used but the other members are unused.

Perhaps a better type definition for Color would be

export interface Color {
  name?: string;
  selectable?: boolean;
  group?: ScaleType;
  domain: string[];
}

or the constructor to ColorHelper should take in a string | ColorDomain type:

export interface ColorDomain {
  domain: string[];
}

To Reproduce Steps to reproduce the behavior:

1. have working code in v18.0.1 using

    this.data = ['No Data'];
    this.colors = new ColorHelper({ domain: ['#ccc'] }, ScaleType.Ordinal, this.data, null);
   

2. update to v19.0.1

3. build

Expected behavior Build success, or at least documentation on what these additional parameters are for and why they are added.

ngx-charts version

19.0.1

[osamaalnuimi]

@Ahmedsk143
check this one it’s working for me

import { Color, ScaleType } from '@swimlane/ngx-charts'; colorScheme: Color = { domain: ['#99CCE5', '#FF7F7F'], group: ScaleType.Ordinal, selectable: true, name: 'Customer Usage', };

[seniordev09]

I am getting same issue on v20.1.0

error TS2322: Type '{ domain: string[]; }' is not assignable to type 'string | Color'.
  Type '{ domain: string[]; }' is not assignable to type 'Color'.