red-g

Statically typed actions and reducers for redux.

$ npm i red-g

ok, what's in here and how to use it?

1. actions as non-const enums (example app/action_type.ts file):

   export enum AppActionType {
       RESET = "App/RESET",
       READY = "App/READY",
       NOT_READY = "App/NOT_READY",
       DELAYED = "App/DELAYED",
       CLEAR_ERROR = "App/CLEAR_ERROR",
   }
   

2. easy action creators - define only those carrying some payload, empty ones are defined automatically (example app/action.ts file):

   import { actionCreators } from "red-g";
   import { AppActionType } from "./action_type";
   
   export default actionCreators(AppActionType, {
       READY: (error?: string) => ({ error }),
       DELAYED: (condition: boolean) => ({ condition }),
   });
   

3. slice of state (app/state.ts):

   export default {
       // usual stuff
       ready: false,
       delayed: false,
   
       // last application error - example use
       // of "type predicate" matcher
       // (matching actions by payload content)
       error: null as string | null,
   
       // how many actions of this type
       // has been spawned? - somewhat artificial
       // example of "boolean" matcher usage
       // (matching actions using string
       // operations on their type)
       actionCount: 0,
   };
   

4. fantastic slice reducers (example app/reducer.ts file) with matchers:

   import type { Action } from "red-g";
   import {
       isWithPayload,
       sliceReducer,
   } from "red-g";
   import initState from "./state";
   import app from "./action";
   
   export default sliceReducer(initState) (
       (slice) => slice
           .handle(app.RESET, () => initState)
   
           // this action can carry `error` payload
           // but we're not interested in it (for now)
           .handle(app.READY, (state) => ({
               ...state, ready: true,
           })
   
           // this action is not carrying any payload
           // and was automatically defined by
           // call to `actionCreators()`
           .handle(app.NOT_READY, (state) => ({
               ...state, ready: false,
           })
   
           // this action is carrying simple payload and we can
           // destructure it immediately
           .handle(app.DELAYED, (state, { condition }) => ({
               ...state, delayed: condition,
           })
   
           // same situation as with `app.NOT_READY`
           // (shown here for completness of the example)
           .handle(app.CLEAR_ERROR, (state) => ({
               ...state, error: null,
           })
   
           // match all actions that carry payload with
           // `error` key ("type predicate" matcher)
           .match(
               (action): action is Action<{ error: string }> =>
                   isWithPayload(action) && action.payload.error,
               (state, { error }) => ({
                   ...state, error,
               }),
           )
   
           // match all actions whose `type` field starts with
           // `App/` prefix ("boolean" matcher)
           .match(
               (action) => action.type.startsWith("App/"),
               (state) => ({
                   ...state, actionCount: state.actionCount + 1,
               }),
           ),
   );
   

5. now, you can combine all of your slice reducers (and actions and thunks...) into nice trees (as you do usually) - example state_logic.ts file:

   import appAction from "./app/action";
   import appReducer from "./app/reducer";
   
   export const action = {
       app: appAction,
       // ... and others
   };
   
   export const reducer = {
       app: appReducer,
       // ... and others
   };
   

6. slice reducers are compatible with regular redux flow:

   import {
       createStore,
       combineReducers,
   } from "redux";
   import {
       bindActionCreatorsTree,
   } from "red-g";
   import {
       action,
       reducer,
   } from "./state_logic";
   
   const rootReducer = combineReducers(reducer);
   
   // redux store creation
   const store = createStore(
       rootReducer,
       // ... and other usual stuff
   );
   
   // bound actions tree
   const act = bindActionCreatorsTree(
       action, store.dispatch,
   );
   

There's more to be happy about if you use IntelliSense.

can I use immer?

Sure! Curried producers are supported out of the box:

import type { Action } from "red-g";
import {
    isWithPayload,
    sliceReducer,
} from "red-g";
import produce from "immer";
import initState from "./state";
import app from "./action";

export default sliceReducer(initState) (
    (slice) => slice
        .handle(app.RESET, () => initState)

        .handle(app.READY, produce((draft) => {
            draft.ready = true;
        })

        .handle(app.DELAYED, produce((draft, { condition }) => {
            draft.delayed = condition;
        })

        .match(
            (action): action is Action<{ error: string }> =>
                isWithPayload(action) && action.payload.error,
            produce((draft, payload) => {
                draft.error = payload.error;
            }),
        ),
);

documentation

API Reference

namespace

static redux

redux

{ actionCreators: [Function: actionCreators],
  bindActionCreator: [Function: bindActionCreator],
  bindActionCreators: [Function: bindActionCreators],
  bindActionCreatorsTree: [Function: bindActionCreatorsTree],
  createReducer: [Function: createReducer],
  defineActionCreator: [Function: defineActionCreator],
  emptyActionCreators: [Function: emptyActionCreators],
  isWithPayload: [Function: isWithPayload],
  isWithTypeField: [Function: isWithTypeField],
  payloadActionCreators: [Function: payloadActionCreators],
  sliceReducer: [Function: sliceReducer] }

notes

Go ahead and file an issue or submit a fresh PR if you found a bug 🐞.

support

You can support this project via stellar network:

• Payment address: xcmats*keybase.io
• Stellar account ID: GBYUN4PMACWBJ2CXVX2KID3WQOONPKZX2UL4J6ODMIRFCYOB3Z3C44UZ

license

red-g is released under the Apache License, Version 2.0. See the LICENSE for more details.