What is the process of utilizing a pre-defined interface with the io-ts library?

Incorporating the @types/fabric package into my application has raised a query for me. I'm eager to utilize predefined interfaces such as ICircleOptions, IRectOptions, and others from fabric types.

Is there a way to use these interfaces in conjunction with the io-ts library for runtime type checking?

My current approach involves defining a type like this:

const Response = t.type({
  id: t.number,
  type: t.string,
  objects: t.array(t.union([ICircleOptions, IRectOptions]))
})

The objective is to integrate fabric's predefines interfaces within the type definition for the objects array.

While browsing through https://github.com/gcanti/io-ts/issues/209, I noticed an example shared by the author of io-ts. However, it doesn't seem to work in my case.

I would greatly appreciate any guidance on whether this integration is feasible or not. Thank you.

typescriptfabricjstypescript-genericsfp-ts

Answer №1

To effectively utilize the types provided by fabric, it is necessary to create a codec for them. For example:

import * as t from "io-ts/Codec";
import { ICircleOptions } from "fabric/fabric-impl";
import { Either } from 'fp-ts/Either'

export const customICircleOptions = t.type({ // alternatively, export const ICircleOptions can be used
  radius: t.number,
  startAngle: t.number,
  endAngle: t.number
});

export const sample: Either<unknown, ICircleOptions> = customICircleOptions.decode({})

// ....

const Response = t.type({
  id: t.number,
  type: t.string,
  objects: t.array(t.union([customICircleOptions, customIRectOptions]))
})

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