use-perf-context v1.0.2

use-perf-context

修订历史

1.About

This is a hight performance react component, which avoid re-render of Context Component.

This implements a more refined rendering strategy and you don't feel it.

Actually, two common ways to avoid re-render are multi-layered contexts and memo components.

Nut they make number of codes too much.I don't like those ways.

I want something easy to use, and the number of my codes is less.

Then use-perf-context was born.

2.Usage

// App.tsx
import PerfContextProvider from "use-perf-context";
function App() {
  // provide Context
  return (
    <PerfContextProvider state={initialState} reducer={globalReducer}>
      <Header />
      <YourComponents />
    </PerfContextProvider>
  );
}

// Header.tsx
import PerfContextProvider from "use-perf-context";
function Header() {
  // consume Context
  // usePerfContext<target property type constraint, dispatch's parame type constraint>
  const [userInfo, dispatch] = usePerfContext<IUserInfo, IAction>("userInfo");

  const { name, age } = userInfo || {};
  renderCount++;
  const addAge = () => {
    dispatch({
      type: ActionType.SET_USER_INFO,
      payload: { name: "mortimer", age: Number(age) + 1 },
    });
  };

  return (
    <div className={classPrefix}>
      <div>{classPrefix}</div>
      <div>user name is ：{name}</div>
      <div>user age is ：{age}</div>
      <button onClick={addAge}>add age +1</button>
      <div>renderCount: {renderCount}</div>
    </div>
  );
}

// Context Store
export interface IUserInfo {
  name: string;
  age: number;
}
export interface IAction {
  type: ActionType;
  payload?: any;
}
export enum ActionType {
  SET_USER_INFO = "SET_USER_INFO",
}
export const initialState: IState = {
  userInfo: {
    name: "",
    age: 0,
  },
};
export const reducer = (state: IState, action: IAction) => {
  switch (action.type) {
    case ActionType.SET_USER_INFO:
      return {
        ...state,
        userInfo: action.payload,
      };
    default:
      return state;
  }
};

3.example demo

CodeSandBox demo: https://codesandbox.io/s/void4-context-rerender--proxy-completed-emv5n0?file=/src/store/index.tsx