Tips for successfully transferring a JsonifyObject<T> from Remix's useLoaderData<typeof loader> to a function

Question

Tips for successfully transferring a JsonifyObject<T> from Remix's useLoaderData<typeof loader> to a function

Encountering a TypeScript error while trying to import JsonifyObject in the Remix 2.9.2 route code below...

Argument of type 'JsonifyObject<IdAndDate>' is not assignable to parameter of type 'IdAndDate'.

Struggling to figure out how to effectively import JsonifyObject:

import { useLoaderData } from "@remix-run/react";

type IdAndDate = {
  id: number;
  date: Date;
};

export default function Component() {
  //
  const idAndDate = useLoaderData<typeof loader>();
  // This part works fine, with idAndDate.date showing as string due to serialization...
  //return (<div>{idAndDate.id}: {idAndDate.date}</div>);

  // However, this encounter an error --
  // "Argument of type 'JsonifyObject<IdAndDate>' is not assignable to parameter of type 'IdAndDate'."
  // -- and I'm unable to figure out how to import JsonifyObject :\
  return <div>{formatIdAndDate(idAndDate)}</div>;
}

export function loader(): IdAndDate {
  return { id: 42, date: new Date() };
}

function formatIdAndDate(idAndDate: IdAndDate): string {
  return `${idAndDate.id}: ${idAndDate.date}`;
}

Attempted solution:

import { JsonifyObject } from "@remix-run/server-runtime/dist/jsonify"

Resulting in the error:

The module '"@remix-run/server-runtime/dist/jsonify"' declares 'JsonifyObject' locally, but it is not exported.

I am at a loss since it is not externally exported either.

Avoiding the usage of as IdAndDate to preserve the recognition by JsonifiyObject that the date is serialized as a string.

(Acknowledging the simplicity of the example, the real scenario involves more intricate logic that warrants browser-side processing.)

Searching for alternatives or possible oversights regarding the availability of JsonifyObject elsewhere.

typescript remix.run

Answer 1

Answer №1

Make sure to incorporate the json helper in your loader function.

return json({ id: 42, date: new Date() })

When utilizing the useLoaderData function in your UI component, you will receive data of type JsonifyObject.

NOTE: It's possible I misinterpreted your query initially.

To obtain the serialized type, employ the SerializeFrom type helper.

type SerializedIdAndDate = SerializeFrom<IdAndDate>

// alternatively

type SerializedIdAndDate = SerializeFrom<typeof loader>

Answer 2

Make sure to incorporate the json helper in your loader function.

return json({ id: 42, date: new Date() })

When utilizing the useLoaderData function in your UI component, you will receive data of type JsonifyObject.

NOTE: It's possible I misinterpreted your query initially.

To obtain the serialized type, employ the SerializeFrom type helper.

type SerializedIdAndDate = SerializeFrom<IdAndDate>

// alternatively

type SerializedIdAndDate = SerializeFrom<typeof loader>

Answer 3

Answer №2

If anyone is looking for a solution with working code based on the suggestion provided in the accepted answer, this might be helpful:

import { useLoaderData } from "@remix-run/react";
import { SerializeFrom } from "@remix-run/node";

type IdAndDate = {
  id: number;
  date: Date;
};

export default function DisplayComponent() {
  const idAndDate = useLoaderData<typeof loader>();
  return <div>{formatIdAndDate(idAndDate)}</div>;
}

export function loader(): IdAndDate {
  return { id: 42, date: new Date() };
}

function formatIdAndDate(idAndDate: SerializeFrom<IdAndDate>): string {
  return `${idAndDate.id}: ${idAndDate.date}`;
}

For those interested in another approach addressing Joe's concern as mentioned in the comments of the accepted answer, the following code block provides an alternative:

This second version converts the serialized object back to its original data type by adjusting any changes made during serialization process back to their original values. In the example given, only the Date attribute requires adjustment.

import { useLoaderData } from "@remix-run/react";

type IdAndDate = {
  id: number;
  date: Date;
};

export default function DisplayComponent() {
  const serializedIdAndDate = useLoaderData<typeof loader>();
  const idAndDate = { id: serializedIdAndDate.id, date: new Date(serializedIdAndDate.date) };
  return <div>{formatIdAndDate(idAndDate)}</div>;
}

export function loader(): IdAndDate {
  return { id: 42, date: new Date() };
}

// now, this function works with the original unserialized type
function formatIdAndDate(idAndDate: IdAndDate): string {
  return `${idAndDate.id}: ${idAndDate.date}`;
}

Answer 4

If anyone is looking for a solution with working code based on the suggestion provided in the accepted answer, this might be helpful:

import { useLoaderData } from "@remix-run/react";
import { SerializeFrom } from "@remix-run/node";

type IdAndDate = {
  id: number;
  date: Date;
};

export default function DisplayComponent() {
  const idAndDate = useLoaderData<typeof loader>();
  return <div>{formatIdAndDate(idAndDate)}</div>;
}

export function loader(): IdAndDate {
  return { id: 42, date: new Date() };
}

function formatIdAndDate(idAndDate: SerializeFrom<IdAndDate>): string {
  return `${idAndDate.id}: ${idAndDate.date}`;
}

For those interested in another approach addressing Joe's concern as mentioned in the comments of the accepted answer, the following code block provides an alternative:

This second version converts the serialized object back to its original data type by adjusting any changes made during serialization process back to their original values. In the example given, only the Date attribute requires adjustment.

import { useLoaderData } from "@remix-run/react";

type IdAndDate = {
  id: number;
  date: Date;
};

export default function DisplayComponent() {
  const serializedIdAndDate = useLoaderData<typeof loader>();
  const idAndDate = { id: serializedIdAndDate.id, date: new Date(serializedIdAndDate.date) };
  return <div>{formatIdAndDate(idAndDate)}</div>;
}

export function loader(): IdAndDate {
  return { id: 42, date: new Date() };
}

// now, this function works with the original unserialized type
function formatIdAndDate(idAndDate: IdAndDate): string {
  return `${idAndDate.id}: ${idAndDate.date}`;
}

Tips for successfully transferring a JsonifyObject<T> from Remix's useLoaderData<typeof loader> to a function

Answer №1

Answer №2

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