Io-ts interface for handling properties with unspecified keys

I'm currently working on implementing an io-ts interface that resembles the following:

export interface myInterface {
  [key:string]?: string | undefined | null
}

My objective is to convert this into its io-ts counterpart. Ultimately, I plan to merge it with an existing io-ts interface as shown below:

export const MyOtherInterfaceV = t.interface({
  requiredProp1: ValidString// custom type, checks string is populated
  requiredProp2: ValidString
  // All other fields marked as required
})

export type MyOtherInterface = t.TypeOf<typeof MyOtherInterfaceV>;

The goal is to create a data structure that includes both mandatory validated fields and optional unknown fields. The intention is to fuse these structures for later processing, eventually storing the data in dynamodb.

typescripttypesfp-tsio-ts-library

Answer №1

It seems like the solution you seek revolves around defining a record:

const myInterfaceCodec = t.record(t.string, t.union([t.string, t.undefined, t.null]));
export type MyInterface = t.TypeOf<typeof myInterfaceCodec>;

=> type MyInterface = { [x: string]: string | null | undefined; }

Your specific scenario:

const myInterfaceV = t.record(t.string, t.union([t.string, t.undefined, t.null]));
export type MyInterface = t.TypeOf<typeof myInterfaceV>;

const myOtherInterfaceV = t.intersection([
    t.type({
        requiredProp1: t.string,
        requiredProp2: t.string
    }),
    myInterfaceV
]);
export type MyOtherInterface = t.TypeOf<typeof myOtherInterfaceV>;

const a: MyOtherInterface = {
    requiredProp1: "string",
    requiredProp2: "string2"
};

const b: MyOtherInterface = {
    requiredProp1: "string",
    requiredProp2: "string2",
    optionalProp1: "hello",
    optionalProp2: "world"
};

Answer №2

Within the realm of io-ts, t.UnknownRecord seems to be the most similar to my custom interface myInterface.

export const MyCustomInterfaceV = t.interface({
  customProp1: t.string,
  customProp2: t.string
})

const MyCustomInterface = t.intersection([t.UnknownRecord, MyCustomInterfaceV]);

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