Is it possible in Typescript to pass method signature with parameters as an argument to another method?

I am working on a React app where I have separated the actions into a different file from the service methods

hoplite.actions.ts

export const fetchBattleResult = createAsyncThunk<Result>(
'battle/fetchBattleResult',
HopliteService.battleResult,
);

hoplite.service.ts

In my service file, I have an async method called battleResult that takes in a parameter of type Battle and returns a Promise of type Result:
const battleResult = async (item: Battle): Promise<Result> =>
  await fetch(`${API_URL}/battle`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(item),
  }).then((response) => response.json());

When trying to send the signature of battleResult, VSCode is showing me an error regarding incompatible types for the parameters. It seems like it's not recognizing the param being passed.

The error message states: 'Argument of type '(item: Battle) => Promise<Result>' is not assignable to parameter of type 'AsyncThunkPayloadCreator<Result, void, {}>'.
  Types of parameters 'item' and 'arg' are incompatible.
    Type 'void' is not assignable to type 'Battle'.ts(2345)

I would greatly appreciate any suggestions on how to correctly specify or include the parameters in the signature when sending it. Thank you!

Answer №1

When you specifically define the first generic argument, the second one defaults to a fallback value of void. To avoid errors, it's important to either provide all arguments or none and let TypeScript infer the types. Mixing explicit and inferred type arguments is not supported.

Both approaches are valid.

export const fetchBattleResult = createAsyncThunk(
  "battle/fetchBattleResult",
  HopliteService.battleResult
);

or

export const fetchBattleResult = createAsyncThunk<Result, Battle>(
  "battle/fetchBattleResult",
  HopliteService.battleResult
);

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Leveraging CSS attribute selectors within JSX using TypeScript

With pure HTML/CSS, I can achieve the following: <div color="red"> red </div> <div color="yellow"> yellow </div> div[color="red"] { color: red; } div[color="yellow"] { color: yellow; ...

Dynamically importing TypeScript interfaces for React code splitting

Is it possible to utilize dynamic import('path') for an exported interface? ...

Enhanced string key indexer type safety in TypeScript

Discover and explore this online TypeScript playground where code magic happens: export enum KeyCode { Alt = 'meta', Command = 'command', // etc. } export type KeyStroke = KeyCode | string; export interface Combination { comb ...

I'm having trouble with TypeScript locating a method specified in a parent class's type definition. What might be causing this issue?

While working with JointJS, I came across the defined typings. In my Typescript class, the structure is as follows: namespace joint { namespace shapes { namespace devs { class Model extends basic.Generic { ... } } } } ...

The SonarQube code coverage differs from that of Jest coverage

I'm struggling to grasp why SonarQube and Jest coverage results differ so significantly. SonarQube coverage resultshttps://i.sstatic.net/dodGi.png Jest coverage https://i.sstatic.net/uYKmt.png https://i.sstatic.net/rakzw.png https://i.sstatic.net/ ...

Could there be an issue with the way I've implemented my setInterval function?

I am currently in the process of developing a stopwatch feature using React Native and implementing the setInterval function to increase a counter and update the state accordingly: Play Function (triggered upon pressing the play button) const [isRunning ...

Is there a way to specifically choose the initial element using Angular? "Backend powered by Django"

Hi there! I've set up Django on the back-end to send data to Angular, and I'm trying to display only the first comment from a list in my HTML page. However, when using limitTo, I encountered this error: Failed to compile. src/app/app.component. ...

Encountering a TypeScript type error when returning a promise from a function

I currently have a scenario in which there is a function that checks if user whitelisting is required. If not, it calls the allowUserToLogin function. If yes, it then checks if a specific user is whitelisted. If the user is not whitelisted, an error is thr ...

Unable to redirect to the initial page successfully

My React application is using Redux-Toolkit (RTK) Query for user login functionality. When the user clicks the "logout" button, it should redirect to the home page ("/"). However, I'm facing an issue where clicking the "logout" button does not trigger ...

Create a class with additional attributes to support different types of options

I define a set of options represented by strings: export type Category = 'people' | 'projects' | 'topics' | 'tools' An index is declared as follows: interface Entry { ... } type IPostEntryIndex = { [name in Cate ...

I'm facing challenges in getting my server action to trigger. The error message that keeps popping up is unexpected submission of a React form

I have been working on developing a registration form using Next.js, react-hook-form, and Zod. Here is the code snippet for the form component: 'use client'; import { z } from "zod"; import { useRef } from "react"; import { u ...

Downloading a PDF in a Next.js application

How can I add a button or link that will instantly download my PDF portfolio when clicked? I am currently working on my resume section and would like to provide users with the option to easily download my CV. Is there a way to do this, and if so, how can ...

Incorporating a Component with lazy-loading capabilities into the HTML of another Component in Angular 2+

Striving to incorporate lazy loading in Angular 2, I have successfully implemented lazy loading by following this helpful guide. Within my application, I have two components - home1 and home2. Home1 showcases the top news section, while home2 is dedicated ...

What is the reason behind Rxjs switchMap only emitting the final value from an of() observable source?

Here are two code snippets, one using map and the other using switchMap. The functionality of map is clear: of('foo', 'bar') .pipe(map((val) => sanitizer(val))) .subscribe((val) => console.log('value:', val)); func ...

Utilizing a string as an index in TypeScript

Struggling with the following code snippet: interface IStudentType { [key: `${Students}`]: IStudent | IStudentMaths| IStudentPhysics } The error message received is TS1268: An index signature parameter type must be 'string', &apos ...

Implementing setState callback in TypeScript with React Hooks

Hello everyone! I am currently working on defining my component types using TypeScript, and I am faced with a challenge. I am trying to set it up so that I can either pass an array of objects or a callback function containing the previous state. Below is t ...

Ways to define an interface that can accommodate various interfaces with a specific structure

I am in need of a function that can accept a parameter with interfaces having a specific structure. The parameter should be either a string hash or a string hash along with an attribute string hash, as shown below: { anotherHash: { a: 'a', ...

Completion of TypeScript code is not working as expected, the variable that is dependent upon is not

Looking for assistance with creating code completion in TypeScript. Variable.Append1 Variable.Append2 Variable.Append3 I have defined the following class: class Variable { Append1(name: string){ if (name == undefined) ...

The name 'BrowseAnimationModule' cannot be located

Can someone help me figure out how to install or fix this import issue I'm having with the 'animations' directory in @angular/platform-browser/animations not importing properly? import {CommonModule} from '@angular/common'; import ...

Why does the onBlur event function in Chrome but fails to work in Safari?

I've encountered a problem with the onBlur event in react-typescript. To replicate the issue, I clicked the upButton repeatedly to increase the number of nights to 9 or more, which is the maximum allowed. Upon further clicking the upButton, an error m ...