2024 06 25 convert class component handtermtsx to functional component using jscodeshift - bizkite-co/handterm GitHub Wiki


original file name: Codeium Chat - 9Ii1DPB9Xlft8cPTZ0Hu1UxFH7qCRxBz.md summary: The user wants to convert a class component, HandTerm.tsx, into a functional component. They have already used jscodeshift and have successfully identified the class component to be transformed. The user provided the code for the HandTerm.tsx file, which includes a class component along with various methods and state management logic. Would you like to know more details about a specific part of the code or have any other questions related to this conversation? date: 2024-06-25T12:27

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User at 12:27 pm, Jun 25, 2024

I want to convert my HandTerm.tsx from a class component to a functional component.

I've installed jscodeshift and ran it and I get this:

[12:11:00]❯ jscodeshift -t ./src/utils/classToFunctional.cjs .\src\components\HandTerm.tsx
Processing 1 files... 
Spawning 1 workers...
Sending 1 files to free worker...
Found class: HandTerm
All done. 
Results:
0 errors
0 unmodified
0 skipped
1 ok

From this code:

/**
 * src/utils/classToFunctional.cjs
 * 
 * This is a basic jscodeshift script to start converting React class components
 * to functional components by transforming class method declarations.
 */

module.exports = function transformer(file, api) {
 const j = api.jscodeshift.withParser('tsx');

 return j(file.source)
  .find(j.ClassDeclaration)
  .forEach(path => {
   // This is where we'll add our transformation logic
   console.log(`Found class: ${path.value.id.name}`);
  })
  .toSource();
};

I would like to incrementally extend this script to transform my HandTerm.tsx:

// HandexTerm.ts
import { LogKeys, TimeHTML, CharDuration, CharWPM, TerminalCssClasses } from '../types/TerminalTypes';
import { IWPMCalculator, WPMCalculator } from '../utils/WPMCalculator';
import { IPersistence, LocalStoragePersistence } from '../Persistence';
import { createHTMLElementFromHTML } from '../utils/dom';
import React, { ContextType, TouchEventHandler } from 'react';
import { XtermAdapter } from './XtermAdapter';
import { NextCharsDisplay } from './NextCharsDisplay';
import { Output } from './Output';
import { TerminalGame } from '../game/TerminalGame';
import ReactDOMServer from 'react-dom/server';
import { ActionType } from '../game/types/ActionTypes';
import Phrases from '../utils/Phrases';
import { IWebCam, WebCam } from '../utils/WebCam';
import { CommandContext } from '../commands/CommandContext';
import { Achievement, Achievements } from '../types/Types';
import { TutorialComponent } from './TutorialComponent';
import { ChordDisplay } from './ChordDisplay';
import { useAuth } from '../lib/useAuth';


export interface IHandTermProps {
 // Define the interface for your HandexTerm logic
 terminalWidth: number;
}

export interface IHandTermState {
 // Define the interface for your HandexTerm state
 outputElements: React.ReactNode[];
 isInPhraseMode: boolean;
 phrase: string;
 phraseIndex: number;
 isActive: boolean;
 commandLine: string;
 heroAction: ActionType;
 zombie4Action: ActionType;
 terminalSize: { width: number; height: number } | undefined;
 terminalFontSize: number;
 canvasHeight: number;
 unlockedAchievements: string[];
 nextAchievement: Achievement | null;
 isInTutorial: boolean;
 commandHistory: string[];
 currentCommandIndex: number;
}

class HandTerm extends React.Component<IHandTermProps, IHandTermState> {
 // Declare the context property with the type of your CommandContext
 static contextType = CommandContext;
 private login = useAuth().login;
 // TypeScript will now understand that this.context is of the type of your CommandContext
 declare context: ContextType<typeof CommandContext>;
 // Implement the interface methods
 private terminalElementRef = React.createRef<HTMLDivElement>();
 public adapterRef = React.createRef<XtermAdapter>();
 private nextCharsDisplayRef: React.RefObject<NextCharsDisplay> = React.createRef();
 private terminalGameRef = React.createRef<TerminalGame>();
 private _persistence: IPersistence;
 private _commandHistory: string[] = [];
 private wpmCalculator: IWPMCalculator = new WPMCalculator();
 private videoElementRef: React.RefObject<HTMLVideoElement> = React.createRef();
 private webCam: IWebCam | null = null;
 private static readonly commandHistoryLimit = 120;
 private isDebug: boolean = false;
 private heroRunTimeoutId: number | null = null;
 private heroSummersaultTimeoutId: number | null = null;
 private lastTouchDistance: number | null = null;
 private currentFontSize: number = 17;
 isShowVideo: any;
 outputRef = React.createRef<HTMLDivElement>();

 loadAchievements(): string[] {
  const storedAchievements = localStorage.getItem('achievements');
  return storedAchievements ? JSON.parse(storedAchievements) : [];
 }

 handleLogin = (username: string, password: string) => {
  this.login(username, password, (error, session) => {
   if (error) {
    console.error(error);
   } else {
    console.log(session);
   }
  });
 }

 saveAchievements(achievementPhrase: string) {
  const storedAchievementString: string = localStorage.getItem('achievements') || '';
  let storedAchievements = storedAchievementString ? JSON.parse(storedAchievementString) : [];
  storedAchievements.push(achievementPhrase);
  localStorage.setItem('achievements', JSON.stringify(storedAchievements));
 }

 getNextAchievement(): Achievement | null {
  const unlockedAchievements = this.loadAchievements() || [];
  const nextAchievement = Achievements.find(a => !unlockedAchievements.some(ua => ua === a.phrase.join('')));
  return nextAchievement || null;
 }

 public focusTerminal() {
  if (this.adapterRef.current) {
   this.adapterRef.current.focusTerminal();
  }
 }

 constructor(IHandexTermProps: IHandTermProps) {
  super(IHandexTermProps);
  this._persistence = new LocalStoragePersistence();
  const initialCanvasHeight = localStorage.getItem('canvasHeight') || '100';
  const nextAchievement = this.getNextAchievement();
  this.state = {
   outputElements: this.getCommandResponseHistory().slice(-1),
   isInPhraseMode: false,
   phrase: '', // Initial value
   phraseIndex: 0,
   isActive: false,
   commandLine: '',
   heroAction: 'Idle',
   zombie4Action: 'Walk',
   terminalSize: undefined,
   terminalFontSize: 17,
   canvasHeight: parseInt(initialCanvasHeight),
   unlockedAchievements: this.loadAchievements(),
   nextAchievement: nextAchievement,
   isInTutorial: true,
   commandHistory: this.loadCommandHistory(),
   currentCommandIndex: -1,
  }
  this.loadDebugValue();
  this.loadFontSize();
 }

 componentDidUpdate(_prevProps: Readonly<IHandTermProps>, _prevState: Readonly<IHandTermState>, _snapshot?: any): void {

 }

 loadCommandHistory() {
  return JSON.parse(localStorage.getItem('commandHistory') || '[]');
 }
 saveCommandHistory(commandHistory: any) {
  localStorage.setItem('commandHistory', JSON.stringify(commandHistory));
 }

 scrollToBottom() {
  if (this.adapterRef.current) {
   this.adapterRef.current.scrollBottom();
  }
 }

 componentDidMount(): void {
  if (this.adapterRef.current) {
   const size = this.adapterRef.current.getTerminalSize();
   if (size) {
    this.setState({ terminalSize: size });
   }
  }
  this.scrollToBottom();

  if (this.videoElementRef.current) {
   this.webCam = new WebCam(this.videoElementRef.current);
  }

  this.addTouchListeners();
 }

 componentWillUnmount(): void {
  if (this.heroRunTimeoutId) {
   clearTimeout(this.heroRunTimeoutId);
  }
  this.removeTouchListeners();
 }

 public handleCommand = (cmd: string) => {
  this.setState(
   // Update the command history
   prevState => ({
    commandHistory: [cmd, ...prevState.commandHistory],
    currentCommandIndex: -1,
   }),
   () => this.saveCommandHistory(this.state.commandHistory)
  );
  // TODO: handle achievement unlocks
  if (this.state.isInTutorial) {
   // Unlock the next achievement and decide if we are still in tutorial mode
   if (cmd === '') cmd = 'Return (ENTER)';
   if (this.state.nextAchievement?.phrase.join('') === cmd
   ) {
    this.unlockAchievement(cmd);
   }
  }
  const {command, args, switches} = this.parseCommand(cmd);
  if (this.context) {
   const output = this.context
    .executeCommand(
     command,
     args,
     switches,
    );
   if (output.status === 200) return;
  }
  let status = 404;
  let response = "Command not found.";
  this.terminalGameRef.current?.resetGame();
  this.scrollToBottom();
  if (this.state.isInPhraseMode) {
   response = "";
  }
  this.setState({ isInPhraseMode: false, commandLine: '' });

  if (command === 'help' || command === '411') {
   status = 200;
   const commandChords = ['UpArrow', 'LeftArrow', 'DownArrow', 'RightArrow'].map(c => {
    return <ChordDisplay displayChar={[c]} />
   });
   const commandChordsHtml = commandChords.map(element => {
    return ReactDOMServer.renderToStaticMarkup(element);
   }).join('');
   response = "<div class='chord-display-container'>" + commandChordsHtml + "</div>";
  }

  if (command === 'kill') {
   if (!this.terminalGameRef.current) return;
   this.terminalGameRef.current.setZombie4ToDeathThenResetPosition();
   this.terminalGameRef.current.completeGame();
   response = "Killed zombie 4. Reset position and game completed.";
   status = 200;
  }

  if (command.startsWith('level')) {
   if (!this.terminalGameRef.current) return;
   let levelNum = command.match(/\d+/);
   const level = levelNum && levelNum.length ? parseInt(levelNum[0]) : null;
   this.terminalGameRef.current?.levelUp(level);
  }

  if (command === 'play' || command.startsWith('play ')) {
   status = 200;
   response = "Type the phrase as fast as you can."
   this.setNewPhrase(command);
  }

  if (command === 'phrase' || command.startsWith('phrase ')) {
   status = 200;
   response = "Type the phrase as fast as you can."
   this.setNewPhrase(command);
  }
  if (command.startsWith('video')) {
   status = 200;
   const isOn = this.toggleVideo();
   if (isOn) {
    response = "Starting video camera..."
   }
   else {
    response = "Stopping video camera..."
   }
  }

  if (this.nextCharsDisplayRef.current) this.nextCharsDisplayRef.current.cancelTimer();
  if (this.state.isInPhraseMode) {
   this.setState({ isInPhraseMode: false });
  }
  // Clear the terminal after processing the command
  // TODO: reset timer
  // Write the new prompt after clearing
  this.adapterRef.current?.prompt();
  if (command === '') return;
  if (command.startsWith('debug')) {
   let isDebug = command.includes('--true') || command.includes('-t');
   this.toggleIsDebug(isDebug);
   return;
  }

  // Truncate the history if it's too long before saving
  if (this._commandHistory.length > HandTerm.commandHistoryLimit) {
   this._commandHistory.shift(); // Remove the oldest command
  }
  this.saveCommandResponseHistory(command, response, status); // Save updated history to localStorage
  return;
 }

 public handleCharacter = (character: string) => {
  const charDuration: CharDuration = this.wpmCalculator.addKeystroke(character);
  if (character.charCodeAt(0) === 3) { // Ctrl+C
   this.setState({ isInPhraseMode: false, commandLine: '' });
   this.adapterRef.current?.terminalReset();
   this.adapterRef.current?.prompt();
  }
  if (character === 'ArrowUp') {
   let newCommandIndex = (this.state.currentCommandIndex + 1) % this.state.commandHistory.length;
   let command = this.state.commandHistory[newCommandIndex];
   const commandResponseHistory = this.getCommandResponseHistory().reverse();
   this.setState({
    currentCommandIndex: newCommandIndex,
    commandLine: command,
    outputElements: [commandResponseHistory[newCommandIndex]],
   });

   this.terminalReset();
   this.terminalPrompt();
   this.terminalWrite(command);
   return;
  }
  if (character.charCodeAt(0) === 4) { // Ctrl+D
   console.log('Ctrl+D pressed');
   this.increaseFontSize();
  }

  if (character.charCodeAt(0) === 13) { // Enter key
   // Process the command before clearing the terminal
   // TODO: cancel timer
   let command = this.adapterRef.current?.getCurrentCommand() ?? '';
   this.terminalReset();
   this.handleCommand(command);
  } else if (this.state.isInPhraseMode) {
   // # IN PHRASE MODE
   this.terminalWrite(character);
   let command = this.adapterRef.current?.getCurrentCommand() + character;

   if (command.length === 0) {
    if (this.nextCharsDisplayRef.current)
     this.nextCharsDisplayRef.current.resetTimer();
    return;
   }

   this.setState({
    commandLine: command,
   });
   if ([',', '.', '!', '?'].includes(character) || /[0-9]/.test(character)) {
    this.setHeroSummersaultAction();
   }
   else {
    this.setHeroRunAction();
   }
  } else {
   // For other input, just return it to the terminal.
   this.terminalWrite(character);
   if ([',', '.', '!', '?'].includes(character) || /[0-9]/.test(character)) {
    this.setHeroSummersaultAction();
   }
   else {
    this.setHeroRunAction();
   }
  }
  return charDuration.durationMilliseconds;
 }

 unlockAchievement = (phrase: string) => {
  this.setState(prevState => {
   const unlockedAchievements = prevState.unlockedAchievements;
   if (this.state.nextAchievement?.phrase.join('') === phrase) {
    this.saveAchievements(phrase);
   }
   const nextAchievement = this.getNextAchievement();
   return {
    ...prevState,
    achievements: unlockedAchievements,
    nextAchievement: nextAchievement,
    isInTutorial: nextAchievement ? true : false
   };
  });
 };

 private parseCommand(input: string): { command: string, args: string[], switches: Record<string, boolean> } {
  const parts = input.split(/\s+/); // Split by whitespace
  const command = parts.shift(); // The first element is the command
  const args = [];
  const switches: Record<string, boolean> = {};

  if (command) {
   for (const part of parts) {
    if (part.startsWith('--')) {
     // It's a switch, remove the '--' and set it to true in the switches object
     const switchName = part.substring(2);
     switches[switchName] = true;
    } else {
     // It's an argument
     args.push(part);
    }
   }
  }

  return { command: command || '', args, switches };
 }

 getCommandResponseHistory(): string[] {
  let keys: string[] = [];
  let commandHistory: string[] = [];
  for (let i = 0; i < localStorage.length; i++) {
   if (!localStorage.key(i)?.startsWith(LogKeys.Command + '_')) continue;

   const key = localStorage.key(i);
   if (!key) continue;
   keys.push(key);
  }
  keys.sort();
  for (let key of keys) {
   const historyJSON = localStorage.getItem(key);
   if (historyJSON) {
    commandHistory.push(historyJSON);
   }
  }
  return commandHistory;
 }

 private WpmsToHTML(wpms: CharWPM[], name: string | undefined) {
  name = name ?? "slowest-characters";
  return (
   <table className="wpm-table">
    <tbody>
     <tr><th colSpan={2}>{name}</th></tr>
     {wpms.map((wpm, index) => (
      <React.Fragment key={index}>
       <tr id={name} className="wpm-table-row" >
        <td>{wpm.character
         .replace("\r", "\\r")
         .replace(" ", "\\s")
        }
        </td>
        <td className="number">{wpm.wpm.toFixed(2)}</td>
       </tr>
      </React.Fragment>
     ))}
    </tbody>
   </table>
  );
 }

 averageWpmByCharacter(charWpms: CharWPM[]): CharWPM[] {
  const charGroups: Record<string, { totalWpm: number, count: number }> = {};

  // Sum WPMs for each character and count occurrences
  charWpms.forEach(({ character, wpm }) => {
   if (!charGroups[character]) {
    charGroups[character] = { totalWpm: 0, count: 0 };
   }
   charGroups[character].totalWpm += wpm;
   charGroups[character].count++;
  });

  // Calculate average WPM for each character
  return Object.entries(charGroups).map(([character, { totalWpm, count }]) => ({
   character,
   wpm: totalWpm / count,
   durationMilliseconds: 0, // You may want to handle duration aggregation differently
  }));
 }

 public saveCommandResponseHistory(command: string, response: string, status: number): string {
  const commandTime = new Date();
  const timeCode = this.createTimeCode(commandTime).join(':');
  let commandText = this.createCommandRecord(command, commandTime);
  // TODO: Render this with JSX instead.
  const commandElement = createHTMLElementFromHTML(commandText);
  let commandResponseElement = document.createElement('div');
  commandResponseElement.dataset.status = status.toString();
  commandResponseElement.appendChild(commandElement);
  commandResponseElement.appendChild(createHTMLElementFromHTML(`<div class="response">${response}</div>`));

  // Only keep the latest this.commandHistoryLimit number of commands
  const wpms = this.wpmCalculator.getWPMs();
  let wpmSum = this.wpmCalculator.saveKeystrokes(timeCode);
  this.wpmCalculator.clearKeystrokes();
  commandResponseElement.innerHTML = commandResponseElement.innerHTML.replace(/{{wpm}}/g, ('_____' + wpmSum.toFixed(0)).slice(-4));

  commandText = commandText.replace(/{{wpm}}/g, ('_____' + wpmSum.toFixed(0)).slice(-4));

  if (!this._commandHistory) { this._commandHistory = []; }
  const commandResponse = commandResponseElement.outerHTML;
  const characterAverages = this.averageWpmByCharacter(wpms.charWpms.filter(wpm => wpm.durationMilliseconds > 1));
  const slowestCharacters = this.WpmsToHTML(characterAverages.sort((a, b) => a.wpm - b.wpm).slice(0, 3), "slow-chars");

  const slowestCharactersHTML = ReactDOMServer.renderToStaticMarkup(slowestCharacters);

  commandResponseElement.innerHTML += slowestCharactersHTML;
  this.writeOutput(commandResponse)

  // Now you can append slowestCharactersHTML as a string to your element's innerHTML
  this._persistence.setItem(`${LogKeys.Command}_${timeCode}`, commandResponseElement.outerHTML);

  return commandResponse;
 }

 writeOutput(output: string) {
  this._commandHistory = [output];
  this.setState({ outputElements: [output] });
 }

 clearCommandHistory(_command: string, args: string[] = [], _switches: Record<string, boolean | string> = {}): void {
  let keys: string[] = [];
  for (let i = localStorage.length; i >= 0; i--) {
   let key = localStorage.key(i);
   if (!key) continue;
   if (
    key.includes(LogKeys.Command)
    || key.includes('terminalCommandHistory') // Remove after clearing legacy phone db.
    || key.includes(LogKeys.CharTime)
   ) {
    keys.push(key);
   }
   if (args.includes("achievements")) {
    if (key.includes('achievements')) {
     keys.push(key);
    }
   }
  }
  for (let key of keys) {
   localStorage.removeItem(key); // Clear localStorage.length
  }
  this._commandHistory = [];
  this.setState({ outputElements: [] });
  this.adapterRef.current?.terminalReset();
  this.adapterRef.current?.prompt();
 }

 createCommandRecord(command: string, commandTime: Date): string {
  let commandText = `<div class="log-line"><span class="log-time">[${this.createTimeHTML(commandTime)}]</span><span class="wpm">{{wpm}}</span>${command}</div>`;
  return commandText;
 }

 private createTimeCode(now = new Date()): string[] {
  return now.toLocaleTimeString('en-US', { hour12: false }).split(':');
 }

 private createTimeHTML(time = new Date()): TimeHTML {
  const hours = time.getHours().toString().padStart(2, '0');
  const minutes = time.getMinutes().toString().padStart(2, '0');
  const seconds = time.getSeconds().toString().padStart(2, '0');
  return `<span class="log-hour">${hours}</span><span class="log-minute">${minutes}</span><span class="log-second">${seconds}</span>`;
 }

 toggleIsDebug(setIsDebug: boolean | undefined) {
  this.isDebug = !this.isDebug;
  if (setIsDebug) {
   this.isDebug = setIsDebug;
  }
  localStorage.setItem('xterm-debug', String(this.isDebug));
  console.log('Xterm debug:', localStorage.getItem('xterm-debug'));
 }

 loadDebugValue() {
  if (localStorage.getItem('xterm-debug') === 'true') {
   this.isDebug = true;
  } else {
   this.isDebug = false;
  }
 }

 handlePhraseSuccess = (phrase: string) => {
  let wpmPhrase = this.wpmCalculator
   .getWPMs().wpmAverage.toString(10)
   + ':' + phrase;
  this.setState(
   prevState => ({
    outputElements: [
     ...prevState.outputElements,
     wpmPhrase
    ]
   })
  );
  this.saveCommandResponseHistory("game", wpmPhrase, 200);

  this.terminalGameRef.current?.completeGame();
  this.adapterRef.current?.terminalReset();
  this.adapterRef.current?.prompt();
  this.terminalGameRef.current?.levelUp();
  this.handlePhraseComplete();
 }

 handlePhraseComplete = () => {

  let newPhraseIndex = (this.state.phraseIndex + 1) % Phrases.phrases.length;
  let newPhrase = Phrases.getPhraseByIndex(newPhraseIndex);
  this.setState({
   phraseIndex: newPhraseIndex,
   isInPhraseMode: true,
   phrase: newPhrase
  });
  this.terminalGameRef.current?.completeGame();
 }

 setNewPhrase = (phraseName: string) => {
  phraseName = phraseName.replace('phrase ', '');

  const newPhrase
   = phraseName && phraseName != "" && Phrases.getPhrase(phraseName)
    ? Phrases.getPhrase(phraseName)
    : Phrases.getPhraseByIndex(this.state.phraseIndex);

  // this.phrase = new Phrase(newPhrase);
  this.setState((prevState) => {
   return {
    ...prevState,
    isInPhraseMode: true,
    phrase: newPhrase,
    commandLine: newPhrase
   }
  });
  // this.props.onNewPhrase(newPhrase); 
 }

 setHeroRunAction = () => {
  // Clear any existing timeout to reset the timer
  if (this.heroRunTimeoutId) {
   clearTimeout(this.heroRunTimeoutId);
   this.heroRunTimeoutId = null;
  }

  // Set the hero to run
  this.setState({ heroAction: 'Run' });
  // Set a timeout to stop the hero from running after 1000ms
  this.heroRunTimeoutId = window.setTimeout(() => {
   this.setState({ heroAction: 'Idle' });
   this.heroRunTimeoutId = null; // Clear the timeout ID
  }, 800);
 }

 setHeroSummersaultAction = () => {
  // Clear any existing timeout to reset the timer
  if (this.heroSummersaultTimeoutId) {
   clearTimeout(this.heroSummersaultTimeoutId);
   this.heroSummersaultTimeoutId = null;
  }

  // Set the hero to run
  this.setState({ heroAction: 'Summersault' });
  // Set a timeout to stop the hero from running after 1000ms
  this.heroSummersaultTimeoutId = window.setTimeout(() => {
   this.setState({ heroAction: 'Idle' });
   this.heroSummersaultTimeoutId = null; // Clear the timeout ID
  }, 800);
 }

 setHeroAction = (newAction: ActionType) => {
  this.setState({ heroAction: newAction });
 }

 setZombie4Action = (newAction: ActionType) => {
  this.setState({ zombie4Action: newAction });
 }

 handleTimerStatusChange(isActive: boolean) {
  this.setState({ isActive });
 }

 private terminalReset(): void {
  this.adapterRef.current?.terminalReset();
 }

 private terminalPrompt(): void {
  this.adapterRef.current?.prompt();
 }

 private terminalWrite(data: string): void {
  this.adapterRef.current?.terminalWrite(data);
 }

 private loadFontSize(): void {
  let getFontSize: string = localStorage.getItem('terminalFontSize') || this.currentFontSize.toString();
  const fontSize = (getFontSize && getFontSize == 'NaN') ? this.currentFontSize : parseInt(getFontSize);

  if (fontSize) {
   this.currentFontSize = fontSize;
   document.documentElement.style.setProperty('--terminal-font-size', `${this.currentFontSize}px`);
  }
 }

 public handleTouchStart: TouchEventHandler<HTMLElement> = (event: React.TouchEvent<HTMLElement>) => {
  setTimeout(() => {
   // this.terminalElement.focus();
  }, 500)
  if (event.touches.length === 2) {
   // event.preventDefault();

   this.lastTouchDistance = this.getDistanceBetweenTouches(event.touches as unknown as TouchList);
  }
 }

 public handleTouchMove = (event: TouchEvent) => {
  if (event.touches.length === 2) {
   event.preventDefault();

   const currentDistance = this.getDistanceBetweenTouches(event.touches);
   if (this.lastTouchDistance && this.lastTouchDistance > 0) {
    const eventTarget = event.target as HTMLElement;
    const scaleFactor = currentDistance / this.lastTouchDistance;
    if (eventTarget && eventTarget.nodeName === 'CANVAS') {
     this.setState((prevState) => {
      return {
       canvasHeight: prevState.canvasHeight * scaleFactor
      }
     })
     return;
    }
    this.currentFontSize *= scaleFactor;
    document.documentElement.style.setProperty('--terminal-font-size', `${this.currentFontSize}pt`);
    this.lastTouchDistance = currentDistance;
    // this.terminal.options.fontSize = this.currentFontSize;
    // this.terminal.refresh(0, this.terminal.rows - 1); // Refresh the terminal display
   }
  }
 }

 public increaseFontSize() {
  this.currentFontSize += 1;
  // this.terminal.options.fontSize = this.currentFontSize;
  // this.terminal.refresh(0, this.terminal.rows - 1);
  localStorage.setItem('terminalFontSize', `${this.currentFontSize}`);
  console.log('INCREASE terminalFontSize', this.currentFontSize);
 }

 public handleTouchEnd: TouchEventHandler<HTMLDivElement> = () => {
  localStorage.setItem('terminalFontSize', `${this.currentFontSize}`);
  console.log('SET terminalFontSize', this.currentFontSize);
  this.lastTouchDistance = null;
 }

 addTouchListeners() {
  // Assuming 'terminalElementRef' points to the div you want to attach the event
  const output = window.document.getElementById(TerminalCssClasses.Output);
  if (output) {
   output.addEventListener('touchmove', this.handleTouchMove, { passive: false });
  }
  const terminal = document.getElementById(TerminalCssClasses.Terminal);
  if (terminal) {
   terminal.addEventListener('touchmove', this.handleTouchMove, { passive: false });
  }
  const game = window.document.getElementById(TerminalCssClasses.TerminalGame);
  if (game) {
   // game.addEventListener('touchstart', this.handleTouchStart );
   game.addEventListener('touchmove', this.handleTouchMove, { passive: false });
  }

 }

 removeTouchListeners() {
  const div = this.terminalElementRef.current;
  if (div) {
   div.removeEventListener('touchmove', this.handleTouchMove);
  }
  const output = window.document.getElementById(TerminalCssClasses.Output);
  if (output) {
   output.removeEventListener('touchmove', this.handleTouchMove);
  }
  const terminal = document.getElementById(TerminalCssClasses.Terminal);
  if (terminal) {
   terminal.removeEventListener('touchmove', this.handleTouchMove);
  }
  const game = window.document.getElementById(TerminalCssClasses.TerminalGame);
  if (game) {
   game.removeEventListener('touchmove', this.handleTouchMove);
  }
 }

 private getDistanceBetweenTouches(touches: TouchList): number {
  const touch1 = touches[0];
  const touch2 = touches[1];
  return Math.sqrt(
   Math.pow(touch2.pageX - touch1.pageX, 2) +
   Math.pow(touch2.pageY - touch1.pageY, 2),
  );
 }

 public toggleVideo = (): boolean => {
  this.isShowVideo = !this.isShowVideo;
  this.webCam?.toggleVideo(this.isShowVideo);
  return this.isShowVideo;
 }

 public render() {
  const { terminalSize } = this.state;
  const canvasWidth = terminalSize ? terminalSize.width : 800;
  // canvas height does not need to match terminal height

  return (
   <CommandContext.Consumer>
    {(context) => {
     this.context = context;
     return (
      <div className="terminal-container">
       <Output
        ref={this.outputRef}
        elements={this.state.outputElements}
        onTouchStart={this.handleTouchStart}
        onTouchEnd={this.handleTouchEnd}
       />
       <TerminalGame
        ref={this.terminalGameRef}
        canvasHeight={this.state.canvasHeight}
        canvasWidth={canvasWidth} // Use the width from terminalSize if available
        isInPhraseMode={this.state.isInPhraseMode}
        heroActionType={this.state.heroAction}
        zombie4ActionType={this.state.zombie4Action}
        onSetHeroAction={this.setHeroAction}
        onSetZombie4Action={this.setZombie4Action}
        onTouchStart={this.handleTouchStart}
        onTouchEnd={this.handleTouchEnd}
       />
       {this.state.isInPhraseMode
        && this.state.phrase
        && <NextCharsDisplay
         ref={this.nextCharsDisplayRef}
         onTimerStatusChange={this.handleTimerStatusChange}
         commandLine={this.state.commandLine}
         isInPhraseMode={this.state.isInPhraseMode}
         newPhrase={this.state.phrase}
         onPhraseSuccess={this.handlePhraseSuccess}
        />
       }
       {Array.isArray(this.state.nextAchievement?.phrase)
        && TutorialComponent
        && <TutorialComponent
         achievement={this.state.nextAchievement}
         isInTutorial={this.state.isInTutorial}
         includeReturn={true}
        />
       }
       <XtermAdapter
        ref={this.adapterRef}
        terminalElement={this.terminalElementRef.current}
        terminalElementRef={this.terminalElementRef}
        terminalFontSize={this.currentFontSize}
        onAddCharacter={this.handleCharacter}
        onTouchStart={this.handleTouchStart}
        onTouchEnd={this.handleTouchEnd}
        onLogin={this.handleLogin}
       />
       {/* TODO: Move this into JSX in the WebCam component */}
       <video
        ref={this.videoElementRef as React.RefObject<HTMLVideoElement>}
        id="terminal-video"
        hidden={!this.isShowVideo}
       >
       </video>
      </div>
     );
    }}
   </CommandContext.Consumer>
  )
 }
}

HandTerm.contextType = CommandContext;
export default HandTerm;

Codeium at 12:28 pm, Jun 25, 2024

To convert your HandTerm.tsx class component into a functional component, you'll have to make some adjustments, particularly around state management, lifecycle methods, and context usage. Here's a simplified version of how your component can be structured as a functional component using React hooks like useState, useEffect, useContext, and useRef for managing state, side effects, context, and references, respectively.

I'll start with the basic structure and include examples of how to handle state, effects, context, and refs. Note that some advanced logic and methods will need to be adjusted or rewritten to fit the functional component paradigm, and custom hooks might be beneficial for complex logic.

import React, { useState, useEffect, useContext, useRef } from 'react';
import { CommandContext } from '../commands/CommandContext';
import { ActionType, Achievement } from '../types/Types';
import { XtermAdapter } from './XtermAdapter';
import { NextCharsDisplay } from './NextCharsDisplay';
import Output from './Output';
import TerminalGame from '../game/TerminalGame';
import TutorialComponent from './TutorialComponent';
import { useAuth } from '../lib/useAuth';

export interface IHandTermProps {
  terminalWidth: number;
}

const HandTerm: React.FC<IHandTermProps> = ({ terminalWidth }) => {
  const context = useContext(CommandContext);
  const [outputElements, setOutputElements] = useState<React.ReactNode[]>([]);
  const [isInPhraseMode, setIsInPhraseMode] = useState<boolean>(false);
  // Add more state variables as needed

  const terminalElementRef = useRef<HTMLDivElement>(null);
  const adapterRef = useRef<XtermAdapter>(null);
  // Add more refs as needed

  const { login } = useAuth();

  useEffect(() => {
    // componentDidMount logic here

    return () => {
      // componentWillUnmount logic here
    };
  }, []); // Passing an empty array so this effect runs only once on mount and unmount

  // Convert class methods to functions within the functional component

  const loadAchievements = (): string[] => {
    const storedAchievements = localStorage.getItem('achievements');
    return storedAchievements ? JSON.parse(storedAchievements) : [];
  };

  // Handle login function
  const handleLogin = (username: string, password: string) => {
    login(username, password, (error, session) => {
      if (error) {
        console.error(error);
      } else {
        console.log(session);
      }
    });
  };

  // More functions converted from class methods go here...

  return (
    <CommandContext.Consumer>
      {() => (
        <div className="terminal-container">
          <Output
            ref={outputRef}
            elements={outputElements}
            // onTouchStart and onTouchEnd handlers as needed
          />
          <TerminalGame
            ref={terminalGameRef}
            // props as needed
          />
          {isInPhraseMode && phrase && 
            <NextCharsDisplay
              ref={nextCharsDisplayRef}
              // props as needed
            />
          }
          {/* More components and JSX as needed */}
        </div>
      )}
    </CommandContext.Consumer>
  );
};

export default HandTerm;

This example covers the basic transformation and setup. You'll need to adapt each lifecycle method (e.g., componentDidMount, componentDidUpdate, and componentWillUnmount) and any class method into hooks (useEffect, custom hooks) or plain functions within the functional component. Remember, hooks can't be used inside loops, conditions, or nested functions, so plan the logic accordingly.

Especially for complex logic, consider breaking down the component into smaller hooks or components to maintain readability and manageability.


User at 12:32 pm, Jun 25, 2024

That is helpful, but I would like to use this script to do the bulk of the modifications. I will need to modify other files and I am using the HandTerm as a test-bed.

I need your help extending this script:

/**
 * src/utils/classToFunctional.cjs
 * 
 * This is a basic jscodeshift script to start converting React class components
 * to functional components by transforming class method declarations.
 */

module.exports = function transformer(file, api) {
 const j = api.jscodeshift.withParser('tsx');

 return j(file.source)
  .find(j.ClassDeclaration)
  .forEach(path => {
   // This is where we'll add our transformation logic
   console.log(`Found class: ${path.value.id.name}`);
  })
  .toSource();
};

Codeium at 12:32 pm, Jun 25, 2024

To extend your script for converting class components to functional components using jscodeshift, you'll need to undertake several steps. The conversion includes transforming class methods into functions, handling state with useState, effects with useEffect, and context with useContext. Below is a basic outline of how you could start extending your script to automate part of this process. This script will be a starting point and might require further refinement based on specific patterns and use cases in your codebase.

const { parse } = require("recast");

module.exports = function transformer(file, api) {
  const j = api.jscodeshift;
  const root = j(file.source);

  root.find(j.ImportDeclaration).forEach(path => {
    // Add React hooks imports at the top if not already present
    if (path.value.source.value === 'react') {
      const hasUseState = path.value.specifiers.some(specifier => specifier.imported && specifier.imported.name === 'useState');
      const hasUseEffect = path.value.specifiers.some(specifier => specifier.imported && specifier.imported.name === 'useEffect');
      const hasUseContext = path.value.specifiers.some(specifier => specifier.imported && specifier.imported.name === 'useContext');

      if (!hasUseState) {
        path.value.specifiers.push(j.importSpecifier(j.identifier('useState')));
      }
      if (!hasUseEffect) {
        path.value.specifiers.push(j.importSpecifier(j.identifier('useEffect')));
      }
      if (!hasUseContext) {
        path.value.specifiers.push(j.importSpecifier(j.identifier('useContext')));
      }
    }
  });

  root.find(j.ClassDeclaration).forEach(path => {
    const className = path.value.id.name;
    const functionalComponentName = className; // You might want to rename based on your convention
    const propsParam = j.identifier('props');
    const propsTypeAnnotation = path.value.superTypeParameters.params[0]; // Assuming class Component<Props, State>

    // Create the functional component with an empty body
    const functionalComponent = j.variableDeclaration("const", [
      j.variableDeclarator(
        j.identifier(functionalComponentName),
        j.arrowFunctionExpression([propsParam], j.blockStatement([]))
      )
    ]);

    // Add props type annotation if exists
    if (propsTypeAnnotation) {
      propsParam.typeAnnotation = j.typeAnnotation(propsTypeAnnotation);
    }

    // Insert the functional component before the class component
    j(path).insertBefore(functionalComponent);

    // Handle state: this.state -> useState
    // Note: This example does not implement state conversion, but you should add logic to find this.state and replace with useState

    // Handle componentDidMount, componentDidUpdate, componentWillUnmount -> useEffect
    // Note: This example does not implement lifecycle methods conversion, but you should add logic for transforming these

    // Remove the class component
    j(path).remove();
  });

  // Return the modified source
  return root.toSource();
};

This script does the following:

  1. Adds imports for useState, useEffect, and useContext if they're not already imported.
  2. Finds class components and prepares to transform them into functional components by creating a skeleton functional component declaration.
  3. Removes the class component declarations (after you've transferred all necessary logic to the functional component).
  4. It's set up to handle props type annotations assuming TypeScript and that you have a single props type parameter.

This script needs additional implementation details for:

  • Converting this.state and setState calls to useState.
  • Transforming lifecycle methods (componentDidMount, componentDidUpdate, componentWillUnmount) into useEffect calls.
  • Handling methods, events, and other class properties appropriately, including converting them to useCallback, useMemo, or plain functions within the functional component.

Remember, automated scripts can cover many cases but might not handle all edge cases or complex class component patterns. Manual review and adjustment will likely be necessary.


User at 12:39 pm, Jun 25, 2024

I am getting this error:

🕐[12:37:10]❯ jscodeshift -t ./src/utils/classToFunctional.cjs .\src\components\HandTerm.tsx
Processing 1 files... 
Spawning 1 workers...
Sending 1 files to free worker...
 ERR .\src\components\HandTerm.tsx Transformation error ({ type: TSTypeReference, start: 1802, end: 1816, loc: [object Object], typeName: [object Object], typeParameters: null } does not match field "typeAnnotation": FlowType of type TypeAnnotation)
Error: { type: TSTypeReference, start: 1802, end: 1816, loc: [object Object], typeName: [object Object], typeParameters: null } does not match field "typeAnnotation": FlowType of type TypeAnnotation
  at addParam (C:\Users\xgenx\scoop\persist\nvm\nodejs\v20.12.1\node_modules\jscodeshift\node_modules\ast-types\src\types.ts:599:17)
  at C:\Users\xgenx\scoop\persist\nvm\nodejs\v20.12.1\node_modules\jscodeshift\node_modules\ast-types\src\types.ts:627:13
  at Array.forEach (<anonymous>)
  at Function.typeAnnotation (C:\Users\xgenx\scoop\persist\nvm\nodejs\v20.12.1\node_modules\jscodeshift\node_modules\ast-types\src\types.ts:625:26)
  at NodePath.<anonymous> (C:\Users\xgenx\source\repos\handex-react\src\utils\/classToFunctional.cjs:48:37)   
  at C:\Users\xgenx\scoop\persist\nvm\nodejs\v20.12.1\node_modules\jscodeshift\src\Collection.js:75:36
  at Array.forEach (<anonymous>)
  at Collection.forEach (C:\Users\xgenx\scoop\persist\nvm\nodejs\v20.12.1\node_modules\jscodeshift\src\Collection.js:74:18)
  at transformer (C:\Users\xgenx\source\repos\handex-react\src\utils\/classToFunctional.cjs:32:33)
All done.
Results:
1 errors
0 unmodified
0 skipped
0 ok

This is my current script:

/**
 * src/utils/classToFunctional.cjs
 * 
 * This is a basic jscodeshift script to start converting React class components
 * to functional components by transforming class method declarations.
 */
const { parse } = require('recast');

module.exports = function transformer(file, api) {
 const j = api.jscodeshift.withParser('tsx');
 const root = j(file.source);

 root.find(j.ImportDeclaration).forEach(path => {
  // Add React hooks imports at the top if not already present
  if (path.value.source.value === 'react') {
   const hasUseState = path.value.specifiers.some(specifier => specifier.imported && specifier.imported.name === 'useState');
   const hasUseEffect = path.value.specifiers.some(specifier => specifier.imported && specifier.imported.name === 'useEffect');
   const hasUseContext = path.value.specifiers.some(specifier => specifier.imported && specifier.imported.name === 'useContext');

   if (!hasUseState) {
    path.value.specifiers.push(j.importSpecifier(j.identifier('useState')));
   }
   if (!hasUseEffect) {
    path.value.specifiers.push(j.importSpecifier(j.identifier('useEffect')));
   }
   if (!hasUseContext) {
    path.value.specifiers.push(j.importSpecifier(j.identifier('useContext')));
   }
  }
 });

 root.find(j.ClassDeclaration).forEach(path => {
  const className = path.value.id.name;
  const functionalComponentName = className; // You might want to rename based on your convention
  const propsParam = j.identifier('props');
  const propsTypeAnnotation = path.value.superTypeParameters.params[0]; // Assuming class Component<Props, State>

  // Create the functional component with an empty body
  const functionalComponent = j.variableDeclaration("const", [
   j.variableDeclarator(
    j.identifier(functionalComponentName),
    j.arrowFunctionExpression([propsParam], j.blockStatement([]))
   )
  ]);

  // Add props type annotation if exists
  if (propsTypeAnnotation) {
   propsParam.typeAnnotation = j.typeAnnotation(propsTypeAnnotation);
  }

  // Insert the functional component before the class component
  j(path).insertBefore(functionalComponent);

  // Handle state: this.state -> useState
  // Note: This example does not implement state conversion, but you should add logic to find this.state and replace with useState

  // Handle componentDidMount, componentDidUpdate, componentWillUnmount -> useEffect
  // Note: This example does not implement lifecycle methods conversion, but you should add logic for transforming these

  // Remove the class component
  j(path).remove();
 });

 // Return the modified source
 return root.toSource();
};

Codeium at 12:39 pm, Jun 25, 2024

The error you're encountering is related to the handling of TypeScript type annotations in your transformation script. Specifically, the error message indicates a mismatch in the expected structure for a type annotation when you're trying to add a type annotation to the props parameter of the converted functional component.

In the context of TypeScript with jscodeshift, you should use TSTypeAnnotation instead of typeAnnotation for adding type annotations. Here’s how you can adjust the relevant part of your script:

// Incorrect approach that leads to the error
propsParam.typeAnnotation = j.typeAnnotation(propsTypeAnnotation);

// Correct approach for TypeScript
if (propsTypeAnnotation) {
  propsParam.typeAnnotation = j.tsTypeAnnotation(propsTypeAnnotation);
}

The corrected section of your script should look something like this:

// Add props type annotation if exists
if (propsTypeAnnotation) {
  propsParam.typeAnnotation = j.tsTypeAnnotation(propsTypeAnnotation);
}

This change specifies that when adding a type annotation to propsParam, you should use j.tsTypeAnnotation to correctly construct a TypeScript type annotation. This adjustment is necessary because your script processes TypeScript (.tsx) files, and the original j.typeAnnotation is intended for use with Flow types, not TypeScript.

Ensure that the rest of your script correctly handles TypeScript constructs, especially when dealing with type annotations, generics, or any other TypeScript-specific syntax.

Updating your script with this change should resolve the transformation error you encountered and allow your script to correctly insert type annotations for the props in the converted functional components.


User at 12:45 pm, Jun 25, 2024

Now, I get this response:

🕐[12:37:19]❯ jscodeshift -t ./src/utils/classToFunctional.cjs .\src\components\HandTerm.tsx
Processing 1 files... 
Spawning 1 workers...
Sending 1 files to free worker...
All done. 
Results:
0 errors
0 unmodified
0 skipped
1 ok

But it converts the 843 line file to a 47 line file.

The entire HandTerm is reduced to this: const HandTerm = (props: IHandTermProps) => {};


Codeium at 12:45 pm, Jun 25, 2024

The issue you're encountering is that the script currently only sets up a skeleton for the converted functional component without actually moving the class component's logic (methods, state, lifecycle methods, etc.) into the functional component. To truly convert class components to functional ones, you need to extend the script to handle the various aspects of the class component, including:

  1. State Conversion: Converting this.state and setState to useState.
  2. Lifecycle Methods Conversion: Converting lifecycle methods like componentDidMount, componentDidUpdate, and componentWillUnmount to useEffect.
  3. Event Handlers and Methods: Converting class methods to functions within the functional component.
  4. Context: Handling contextType and converting it to useContext if used.
  5. Refs: Handling createRef and converting them to useRef if used.

Since your script currently does not perform these conversions, it only replaces the class with an empty functional component, hence the significant reduction in file size. To address this, let's outline how you could start to handle state and lifecycle methods conversion as an example. Note that this is a complex process and might require custom handling based on specific use cases in your code.

Handling State with useState

To convert state, you would need to find all instances of this.state and setState calls within the class component, extract the initial state from the class constructor or property initializer, and convert them to useState hooks. This process is nuanced and may require manual adjustments after the initial conversion.

Converting Lifecycle Methods with useEffect

Lifecycle method conversion to useEffect is another complex area. For example, componentDidMount logic can be moved into a useEffect with an empty dependency array, while componentDidUpdate logic might need conditional execution based on specific prop or state changes.

Example Extension for Lifecycle Methods

Here is a simplified example of what extending the script to handle componentDidMount might look like:

// Inside your root.find(j.ClassDeclaration).forEach loop

// Find componentDidMount method
const componentDidMountMethod = path.value.body.body.find(method => 
  method.type === 'MethodDefinition' && 
  method.key.name === 'componentDidMount'
);

if (componentDidMountMethod) {
  // Create a useEffect call with componentDidMount logic
  const useEffectCall = j.expressionStatement(
    j.callExpression(
      j.identifier('useEffect'), 
      [
        j.arrowFunctionExpression([], j.blockStatement(componentDidMountMethod.value.body.body)),
        j.arrayExpression([]) // Dependency array
      ]
    )
  );

  // Insert useEffect call into functional component
  functionalComponent.declarations[0].init.body.body.push(useEffectCall);
}

This is a very basic example and doesn't cover all scenarios. For a full conversion, you would need to handle all aspects of the class component's functionality. Due to the complexity and variability of class components, automated scripts can only go so far, and manual review and adjustments will almost always be necessary after conversion.

Given the specific needs of class to functional component conversion, especially with TypeScript, it might be beneficial to start with automated scripts for the straightforward parts but plan for a significant amount of manual refactoring to ensure all component functionality is correctly preserved and adapted to the React Hooks model.


User at 12:50 pm, Jun 25, 2024

Instead of handling the dificult conversions first, let's handle the simplest conversions first so that maybe there will only be a few dificult ones.

Can't we start with class properties and methods?


Codeium at 12:50 pm, Jun 25, 2024

Starting with the simpler conversions like class properties and methods makes sense and can indeed streamline the process of converting class components to functional components. Handling these elements first can reduce the complexity of the remaining conversions by breaking down the process into more manageable steps. Below is a modified approach focusing on converting class properties and methods, excluding lifecycle methods and state management for now.

Converting Class Properties and Methods

Class properties (including event handlers and other methods) can be directly converted into functions within the functional component. This step doesn't handle state or lifecycle methods yet but sets up the foundation for a functional component.

Here's how you could extend your script to handle class properties and methods:

module.exports = function transformer(file, api) {
  const j = api.jscodeshift.withParser('tsx');
  const root = j(file.source);

  root.find(j.ImportDeclaration).forEach(path => {
    // Add React hooks imports at the top if not already present
    // As before, ensure useState, useEffect, useContext are imported if needed
  });

  root.find(j.ClassDeclaration).forEach(path => {
    const className = path.value.id.name;
    const functionalComponentName = className; // You might want to rename based on your convention
    const propsParam = j.identifier('props');
    
    // Assuming class Component<Props, State>
    const propsTypeAnnotation = path.value.superTypeParameters.params[0];

    // Start building the functional component
    const functionalComponentBody = [];

    // Convert class properties and methods to functions inside the functional component
    path.value.body.body.forEach(classElement => {
      if (classElement.type === 'ClassProperty' || classElement.type === 'MethodDefinition') {
        // For simplicity, this example treats both properties and methods similarly
        // You might need to handle them differently based on your use case
        if (classElement.value && classElement.value.type === 'FunctionExpression') {
          functionalComponentBody.push(
            j.variableDeclaration('const', [
              j.variableDeclarator(
                j.identifier(classElement.key.name),
                j.arrowFunctionExpression(classElement.value.params, classElement.value.body)
              )
            ])
          );
        }
      }
    });

    // Create the functional component with the converted methods
    const functionalComponent = j.variableDeclaration("const", [
      j.variableDeclarator(
        j.identifier(functionalComponentName),
        j.arrowFunctionExpression([propsParam], j.blockStatement(functionalComponentBody))
      )
    ]);

    // Add props type annotation if exists
    if (propsTypeAnnotation) {
      propsParam.typeAnnotation = j.tsTypeAnnotation(propsTypeAnnotation);
    }
    
    // Insert the functional component before the class component
    j(path).insertBefore(functionalComponent);

    // Remove the class component
    j(path).remove();
  });

  // Return the modified source
  return root.toSource();
};

This script now attempts to handle class properties and methods by converting them into functions within the functional component. It doesn't yet deal with more complex conversions like state or lifecycle methods, which will indeed require more sophisticated handling.

Note: This script assumes that all class properties and methods can be directly converted into functions without significant modification. In practice, you may encounter methods that require access to this.props, this.state, or other class-specific features, which would need to be adapted for functional component usage (e.g., using useState, useEffect, useContext).

After running this script, you will likely still need to manually adjust the converted component, especially for state management, lifecycle methods, and any class-specific logic that doesn't directly translate to a functional component paradigm.


User at 12:56 pm, Jun 25, 2024

That results in a HandTerm consisting of this in it's entirety: const HandTerm = (props: IHandTermProps) => {};


Codeium at 12:56 pm, Jun 25, 2024

Given that the conversion script is resulting in an overly simplified output, it seems the current logic isn't capturing or correctly converting the methods and properties of your class component. This issue could be due to the way methods and properties are defined in your class or how the script is detecting and handling these class elements.

To approach this, we'll refine the script to ensure it:

  1. Correctly identifies class methods and properties.
  2. Converts these methods and properties to equivalent functional component constructs.

Improved Script for Converting Methods and Properties

Below is a more detailed approach to ensure your class's methods and properties are converted correctly. This script will look for class methods (including lifecycle methods for demonstration, which you might handle separately) and class fields that are not part of the built-in React lifecycle. It will convert these into equivalent functions or constants within the functional component body.

module.exports = function transformer(file, api) {
  const j = api.jscodeshift;
  const root = j(file.source);

  root.find(j.ClassDeclaration).forEach(path => {
    const className = path.value.id.name;
    // Create a new array to hold functions and other statements for the functional component
    const functionalComponentBody = [];
    const hooksImportCheck = new Set();

    // Convert class methods to functions
    path.value.body.body.forEach(classElement => {
      if (classElement.type === 'MethodDefinition' && classElement.kind === 'method') {
        const methodName = classElement.key.name;
        // Skip constructor and React lifecycle methods for manual handling or specific conversion
        if (methodName !== 'constructor' && !['render', 'componentDidMount', 'componentDidUpdate', 'componentWillUnmount'].includes(methodName)) {
          const methodFunction = j.functionDeclaration(j.identifier(methodName), classElement.value.params, classElement.value.body);
          functionalComponentBody.push(methodFunction);
        }
      }
    });

    // Check for state and lifecycle methods to add useState and useEffect hooks if needed
    // This part is simplified and needs more logic to handle actual conversion
    if (path.value.body.body.some(element => element.type === 'ClassProperty' && element.key.name === 'state')) {
      hooksImportCheck.add('useState');
    }

    if (path.value.body.body.some(element => ['componentDidMount', 'componentDidUpdate', 'componentWillUnmount'].includes(element.key.name))) {
      hooksImportCheck.add('useEffect');
    }

    // Create the functional component
    const functionalComponent = j.variableDeclaration("const", [
      j.variableDeclarator(
        j.identifier(className),
        j.arrowFunctionExpression([], j.blockStatement(functionalComponentBody))
      )
    ]);

    // Ensure hooks are imported if needed
    if (hooksImportCheck.size > 0) {
      let reactImportDeclaration = root.find(j.ImportDeclaration, { source: { value: 'react' } });
      if (reactImportDeclaration.size() === 0) {
        // If there's no React import (unlikely but just in case), add one
        reactImportDeclaration = j.importDeclaration([], j.literal('react'));
        root.get().node.program.body.unshift(reactImportDeclaration);
      }
  
      const { specifiers } = reactImportDeclaration.paths()[0].value;
      hooksImportCheck.forEach(hookName => {
        if (!specifiers.some(specifier => specifier.imported.name === hookName)) {
          specifiers.push(j.importSpecifier(j.identifier(hookName)));
        }
      });
    }

    // Insert the functional component before the class component
    j(path).insertBefore(functionalComponent);

    // Remove the class component
    j(path).remove();
  });

  return root.toSource({ quote: 'single' });
};

Important Considerations:

  • State and Lifecycle Methods: This script doesn't yet handle state (this.state and setState) and lifecycle methods (componentDidMount, etc.) conversion. You'd need to implement specific logic to convert these based on their usage patterns in your class component.
  • Method Handling: The script now attempts to convert class methods into functions outside the functional component's body. Depending on how these methods interact with component state or props, they may need to be adjusted to use hooks (useState, useEffect, etc.) or be defined inside the functional component to access props directly.
  • Props and TypeScript Types: The script doesn't currently handle props and their TypeScript types within the functional component. You'll likely need to manually adjust the functional component definition to include props and any necessary type annotations.

This refined approach should help ensure that the conversion script captures and converts the class component's methods and properties more accurately. However, given the complexities involved in converting class components to functional components, especially with TypeScript types and React's hooks, manual review and adjustment will be necessary to ensure a fully functional and idiomatic React component post-conversion.

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