Creating a unique attribute in FabricJS object using TypeScript

Encountering a TypeScript error when trying to add a custom attribute to a new FabricJS object. How can I extend the IObjectOptions globally to include this custom attribute?

const workarea = new fabric.Rect({
  id: "workarea",
  width: 250,
  height: 150,
});

Upon hovering over the "id: workarea", the following error message is displayed:

Argument of type '{ id: string; width: number; height: number; }' is not assignable to parameter of type 'IRectOptions'. Object literal may only specify known properties, and 'id' does not exist in type 'IRectOptions'.

javascripttypescriptfabricjs

Answer №1

id is not a recognized attribute for the IRectOptions interface: it pertains to the options argument of the rectangle's constructor object.

Nevertheless, you can utilize Object.assign() to assign your custom properties to an instance of Rect. For example:

TS Playground

import {fabric} from 'fabric';

const workarea = Object.assign(
  new fabric.Rect({
    width: 250,
    height: 150,
  }),
  {id: "workarea"},
);

workarea;
//^? const workarea: fabric.Rect & { id: string; }

workarea.id;
       //^? (property) id: string

For more information, refer to: fabricjs/fabric.js#6917 - How to add custom attributes to Fabric objects and ensure they are retained when converting objects to JSON?

Answer №2

Explore the power of Typescript Module Augmentation

declare module 'fabric/fabric-impl' {
    export interface IObjectOptions {
        uuid?: string;
    }
}

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