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Effect manager for HTTP requests





npm version build Coverage Status code style: prettier MIT license

Effect manager for HTTP requests


Make HTTP requests in typescript-tea. Talk to servers.

How to use

yarn add @typescript-tea/http


Please see the documentation site.


Here is a funny cats loader example:

import React from "react";
import ReactDOM from "react-dom";
import { exhaustiveCheck } from "ts-exhaustive-check";
import { Cmd, Program, Dispatch, Result } from "@typescript-tea/core";
import * as Http from "@typescript-tea/http";

// -- Press a button to send a GET request for random cat GIFs.

// -- STATE

type State =
  | { readonly type: "Failure" }
  | { readonly type: "Loading" }
  | { readonly type: "Success"; readonly url: string };

const init = (): readonly [State, Cmd<Action>] => [{ type: "Loading" }, getRandomCatGif()];

// -- UPDATE

type Action =
  | { readonly type: "MorePlease" }
  | { readonly type: "GotGif"; readonly result: Result<Http.Error, string> };

function update(action: Action, _state: State): readonly [State, Cmd<Action>?] {
  switch (action.type) {
    case "MorePlease":
      return [{ type: "Loading" }, getRandomCatGif()];
    case "GotGif":
      console.log("action", action);
      switch (action.result.type) {
        case "Ok":
          return [{ type: "Success", url: action.result.value }, undefined];
        case "Err":
          return [{ type: "Failure" }, undefined];
          return exhaustiveCheck(action.result, true);
      return exhaustiveCheck(action, true);

// -- VIEW

function view({ dispatch, state }: { readonly dispatch: Dispatch<Action>; readonly state: State }): JSX.Element {
  return (
      <h2>Random Cats</h2>
      {viewGif(dispatch, state)}

function viewGif(dispatch: Dispatch<Action>, state: State): JSX.Element {
  switch (state.type) {
    case "Failure":
      return (
          I could not load a random cat for some reason.
          <button onClick={() => dispatch({ type: "MorePlease" })}>Try Again!</button>

    case "Loading":
      return <span>Loading...</span>;
    case "Success":
      return (
          <button onClick={() => dispatch({ type: "MorePlease" })} style={{ display: "block" }}>
            More Please!
          <img src={state.url} />
      return exhaustiveCheck(state);

// -- HTTP

function getRandomCatGif(): Cmd<Action> {
  return Http.get(
    Http.expectJson((result) => ({ type: "GotGif", result }), gifDecoder)

function gifDecoder(s: string): Result<string, string> {
  try {
    const parsed = JSON.parse(s);
    if ( !== undefined) {
      return Result.Ok(;
  } catch (e) {
    return Result.Err("Bad format");
  return Result.Err("Bad format");


const program: Program<State, Action, JSX.Element> = {


const app = document.getElementById("app");
const render = (view: JSX.Element) => ReactDOM.render(view, app);, render, [Http.createEffectManager()]);

How to develop

Node version >=12.6.0 is needed for development.

To execute the tests run yarn test.

How to publish

yarn version --patch
yarn version --minor
yarn version --major