Frontend Develop Log

Using

TypeScript

npx create-react-app frontend --template typescript

SASS

npm i node-sass
npm i @types/node-sass

Recoil

npm i recoil

Styled-components

npm i styled-components

React-testing-library

npm i react-testing-library
npm i jest-dom
npm i @types/jest

jest-dom 은 jest 의 확장으로서, DOM 에 관련된 matcher 를 추가해줌

VSC 사용 경우 @types/jest 설치

react-router-dom

npm i react-router-dom
npm i @types/react-router-dom

react-transition-group

npm i react-transition-group
npm i @types/react-transition-group

FontAwesome Icon

npm i --save @fortawesome/react-fontawesome
npm i --save @fortawesome/fontawesome-svg-core
npm i --save @fortawesome/free-solid-svg-icons
npm i --save @fortawesome/free-regular-svg-icons
npm i --save @fortawesome/free-brands-svg-icons

Gh pages

npm install gh-pages --save-dev

Absolute Path

"compilerOptions": {
        "baseUrl": "src",
        ...
}

React-mde

react markdown editor

// react 17.0.2 is not supported
npm i react-mde --force

React-markdown

markdown converter

npm i react-markdown

React-query

npm i react-query
npm i @types/react-query

React-google-login

npm i react-google-login

lodash

npm i lodash
npm i @types/lodash

Development

• React-mde

  마크다운 에디터를 사용하기 위해 설치

import ReactMde from "react-mde";
import ReactMarkdown from "react-markdown";

function Compo() {
    const [value, setValue] = useState<string | undefined>("");
    const [selectedTab, setSelectedTab] =
        useState<"write" | "preview">("write");

    return (
        <ReactMde
            value={value}
            onChange={setValue}
            selectedTab={selectedTab}
            onTabChange={setSelectedTab}
            generateMarkdownPreview={(markdown) =>
                Promise.resolve(<ReactMarkdown source={markdown} />)
            }
            childProps={{
                writeButton: {
                    tabIndex: -1,
                },
            }}
            minEditorHeight={72} // 에디터 최소 높이
            minPreviewHeight={72} // 프리뷰 최소 높이
            heightUnits={"vh"} // 높이 단위
            // loadSuggestions={function} // 자동 추천
        ></ReactMde>
    );
}

• React-markdown

  React-mde의 Preview와 마크다운 포맷을 보여주기 위해 사용

import ReactMarkdown from "react-markdown";

function Compo() {
    const md = `# Title\n### Something\n> blahblah`;
    return <ReactMarkdown>{md}</ReactMarkdown>;
}

• Redux useSelector

  리덕스의 상태값을 조회하기 위한 Hook, mapStateToProps

import { useSelector } from "react-redux";
import { RootState } from "modules";
...

const currentUser = useSelector((state: RootState) => state.user);

• equalityFn

  이전 값과 다음 값을 비교하여 렌더링 여부를 결정

const test = useSelector(
    (state) => state.test,
    (prev, next) => prev.count === next.count
);

• shallowEqual

  비교할 것이 여러 개일 경우 equalityFn는 번거로워지기 때문에, 최상위 값들에 한해서 비교를 수행해주는 shallowEqual이 존재

import { useSelector, shallowEqual } from "react-redux";
...

const test = useSelector((state) => state.test, shallowEqual);

• useDispatch

  리덕스 상태를 dispatch하기 위한 Hook, mapDispatchToProps

import { useDispatch } from "react-reudx";
import { actionCreator } from "modules/something";
...

const dispatch = useDispatch();

const withActionType = () => {
    dispatch({type: ACTION_TYPE })
}

const withActionCreator = (args) => {
    dispatch(actionCreator(args));
}

• createPortal

  부모 컴포넌트의 DOM 계층 구조 바깥에 있는 DOM 노드로 자식을 렌더링하는 방법, 리액트 v16에서 도입된 기능

ReactDOM.createPortal(그릴 DOM, 그릴 곳);

• Cursor

cursor: pointer;
cursor: text; /* input의 커서 */
cursor: help; /* 도움말 */
cursor: wait; /* 기다림 */
cursor: grab; /* 드래그할 수 있는 것 같이 */
cursor: zoom-in; /* 확대할 수 있는 것 같이 */

• Styled-components declaration

// style/styled.d.ts
import "styled-components";

declare module "styled-components" {
    export interface DefaultTheme {
        colors: {
            white: string;
            background: string;
        };
        something: string;
        youWant: string;
    }
}

// style/theme.ts
import { DefaultTheme } from "styled-components";

const theme: DefaultTheme = {
    colors: {
        white: "#ffffff",
        background: "#000000",
    },
    something: "0px",
    youWant: "1rem",
};

• React-query useQuery

basic usage

import { useQuery } from "react-query";

const someComponent = () => {
    const { data, isLoading, error } = useQuery("someData", () => {
        axiois.get(GET_API_URL);
    });

    if (isLoading) return <Loading />;
    if (error) return <Error />;
    return (
        <div>
            <h1>{data.name}</h1>
        </div>
    );
};

• Styled-components props with TS

const StyledBtn = styled.button<{width: string}>`
    width: ${({width}) => `${width}px`}
`;


interface StyledSpanProps {
    fontSize: string;
    color: string;
    ...
}

const StyledSpan = styled.span<StyledSpanProps>`
    color: ${({color}) => color};
    ...
`;

• Recoil atom usage

// store/user.ts
import { atom } from "recoil";
import { ICurrentUser } from "types";

export const currentUserState = atom<ICurrentUser>({
    key: "currentUserState",
    default: { isSigned: false },
});

// when using state
import { useRecoilState } from "recoil";
import { currentUserState } from "store/user";
...

const [currentUser, setCurrentUser] = useRecoilState(currentUserState);

// when using state's value
import {useRecoilValue} from "recoil";
...

const currentUser = useRecoilValue(currentUserState);

// when using state's set method
import {useSetRecoilState} from "recoil";
...

const setCurrentUser = useSetRecoilState(currentUserState);

Issue

• ERROR Modal: ref is not a prop.

  prop의 이름은 ref가 안됨

Fix

// refs로 이름을 바꾸어 해결
const TempCompo = () => {
    const tempRef = useRef<HTMLDivElement>(null);

    return <NextCompo refs={tempRef} />;
};

interface INextCompo {
    refs: HTMLDivElement | null;
}
const NextCompo = ({ refs }: INextCompo) => {
    return <div ref={refs}> something </div>;
};

• ERROR Type 'RefObject' is missing the following properties

Fix

interface ISomething {
    refs: React.RefObject<HTMLDivElement>;
}

• ERROR idpiframe_initialization_failed when google login

mount시 Client ID가 틀렸다고 말하며, 구글 로그인 시 popup_closed_by_user 오류를 뱉는 현상

Fix

브라우저의 모든 쿠키과 캐시를 삭제하여 해결 ...