### cat\src\builder.js

```javascript
/**
 * Builder Module
 * 
 * This module takes the interpreted component parts and assembles them into a Custom Element class.
 */

class Builder {
    /**
     * Build a Custom Element class from the interpreted component parts with optimization:
     * - Build DOM once using a static DocumentFragment.
     * - Initialize variables in the constructor.
     * - Clone and append the fragment in connectedCallback.
     * 
     * @param {Object} component - The interpreted component object.
     * @param {string} component.tagName - The tag name for the custom element.
     * @param {Object} component.script - The interpreted script object.
     * @param {string[]} component.script.variables - Array of variable declarations.
     * @param {string[]} component.script.methods - Array of method definitions.
     * @param {string[]} component.script.calls - Array of function calls.
     * @param {Object} component.script.eventListeners - Object containing event listener registrations.
     * @param {string[]} component.script.eventListeners.connect - Array of event listener initialization statements.
     * @param {string[]} component.script.eventListeners.disconnect - Array of event listener removal statements.
     * @param {string} transformedDOM - The JavaScript code for building the DOM structure.
     * @returns {string} - The assembled Custom Element class as a string.
     */
    static buildCustomElement(component, transformedDOM) {
        const { tagName, script } = component;
        const className = this.kebabToPascalCase(tagName);

        // Initialize variables in the constructor
        const variableAssignments = script.variables.join('\n        ');

        // Event listeners for connect and disconnect
        const connectListeners = script.eventListeners.connect.join('\n        ');
        const disconnectListeners = script.eventListeners.disconnect.join('\n        ');

        // Function calls to execute after DOM is appended
        const functionCalls = script.calls.join('\n        ');

        // Methods of the class
        const methods = script.methods.join('\n\n    ');

        return `
class ${className} extends HTMLElement {
    /**
     * DocumentFragment shared across all instances.
     * Built once to optimize memory usage.
     */
    _masterFragment = (function() {
        // Build the DOM once
        ${transformedDOM}
        return fragment;
    })();

    /**
     * Constructor initializes properties.
     */
    constructor() {
        super();
        // Initialize properties
        ${variableAssignments}
    }

    /**
     * Invoked each time the custom element is appended into a document-connected element.
     */
    connectedCallback() {
        // Clone the master fragment and append to the DOM
        const clonedFragment = ${className}._masterFragment.cloneNode(true);
        this.appendChild(clonedFragment);

        // Initialize event listeners
        ${connectListeners}

        // Execute any additional function calls
        ${functionCalls}
    }

    /**
     * Invoked each time the custom element is disconnected from the document's DOM.
     */
    disconnectedCallback() {
        // Remove event listeners
        ${disconnectListeners}
    }

    ${methods}
}

customElements.define('${tagName}', ${className});
        `.trim();
    }

    /**
     * Convert a kebab-case string to PascalCase.
     * 
     * @param {string} str - The kebab-case string to convert.
     * @returns {string} - The PascalCase version of the input string.
     */
    static kebabToPascalCase(str) {
        return str.split('-').map(part => part.charAt(0).toUpperCase() + part.slice(1)).join('');
    }
}

module.exports = Builder;
```

### cat\src\collector.js

```javascript
const fs = require('fs-extra');
const path = require('path');
const glob = require('glob');
const { determineFileType } = require('./typeof');

/**
 * Collect and structure HTML files from the project
 * @param {string} projectRoot - Root directory of the project
 * @returns {Object} - Structured object of HTML files
 */
async function collectHTMLFiles(projectRoot) {
  const htmlFiles = glob.sync('**/*.html', {
    cwd: projectRoot,
    ignore: ['node_modules/**', 'cat/**'],
  });

  const collectedFiles = {};

  for (const file of htmlFiles) {
    const filePath = path.join(projectRoot, file);
    const content = await fs.readFile(filePath, 'utf-8');
    const fileType = determineFileType(file);
    const title = path.basename(file, path.extname(file));

    collectedFiles[file] = {
      title,
      type: fileType,
      body: content, // Start with raw content
    };
  }

  return collectedFiles;
}

module.exports = { collectHTMLFiles };
```

### cat\src\index.js

```javascript
const path = require('path');
const fs = require('fs-extra');
const { collectHTMLFiles } = require('./collector');
const ParsingPipeline = require('./parser');
const Interpreter = require('./interpreter');
const ScriptInterpreter = require('./sinterpreter');
const Builder = require('./builder');
const { transformToJavaScript } = require('./transformer'); // Import transformer

async function initializeCompiler(indexPath) {
    const projectRoot = path.dirname(indexPath);
    const collectedFiles = await collectHTMLFiles(projectRoot);

    const processedFiles = {};
    const scriptInterpreter = new ScriptInterpreter();
    const builtComponents = {};

    for (const [file, fileData] of Object.entries(collectedFiles)) {
        try {
            // Parsing step
            const parsed = ParsingPipeline.parseHTML(fileData.body, file);
            
            // HTML Interpretation step
            const interpreted = {
                ...parsed,
                body: Interpreter.interpretBody(parsed.body)
            };

            // Script Interpretation step
            const scriptInterpreted = interpreted.script 
                ? scriptInterpreter.interpret(interpreted.script)
                : { variables: [], methods: [], calls: [], eventListeners: { connect: [], disconnect: [] } };

            processedFiles[file] = {
                ...interpreted,
                script: scriptInterpreted
            };

            // Transformation step
            const transformedDOM = transformToJavaScript(interpreted.body);

            // Building step
            const builtComponent = Builder.buildCustomElement(processedFiles[file], transformedDOM);
            builtComponents[file] = builtComponent;

            console.log(`\nFile: ${file}`);
            console.log('Type:', interpreted.type);
            console.log('Tag Name:', interpreted.tagName);
            console.log('Parsed body:', JSON.stringify(parsed.body, null, 2));
            console.log('Interpreted body:', JSON.stringify(interpreted.body, null, 2));
            console.log('Transformed DOM:', transformedDOM);
            console.log('Interpreted script:', JSON.stringify(scriptInterpreted, null, 2));
            console.log('Built Component:', builtComponent);
            console.log('Style:', interpreted.style);
        } catch (error) {
            console.error(`Error processing ${file}:`, error.message);
        }
    }

    return {
        async compile() {
            let indexContent = await fs.readFile(indexPath, 'utf-8');
            
            const debugInfo = `
<script>
    console.log('Processed files:', ${JSON.stringify(processedFiles, null, 2)});
    console.log('Built Components:', ${JSON.stringify(builtComponents, null, 2)});
</script>
            `;
            // **Modify this line to inject before </head> instead of </body>**
            indexContent = indexContent.replace('</head>', `${debugInfo}</head>`);

            // Inject built components into the head of the index file
            const componentsScript = `<script>${Object.values(builtComponents).join('\n\n')}</script>`;
            indexContent = indexContent.replace('</head>', `${componentsScript}</head>`);

            return indexContent;
        }
    };
}

module.exports = { initializeCompiler };
```

### cat\src\interpreter.js

```javascript
/**
 * Interpreter Module
 */
const Interpreter = (function() {
  /**
   * Convert custom syntax to JavaScript Template Literals
   * @param {string} content - The content to interpret
   * @returns {string} - The interpreted content
   */
  function interpretContent(content) {
    return content.replace(/\{([^}]+)\}/g, (match, p1) => `\${this.${p1.trim()}}`);
  }

  /**
   * Recursively interpret the parsed body
   * @param {Array} body - The parsed body
   * @returns {Array} - The interpreted body
   */
  function interpretBody(body) {
    return body.map(node => {
      if (node.type === 'tag') {
        return {
          ...node,
          children: interpretBody(node.children)
        };
      } else if (node.type === 'text') {
        return {
          ...node,
          content: interpretContent(node.content)
        };
      }
      return node;
    });
  }

  // Public API
  return {
    interpretBody
  };
})();

module.exports = Interpreter;
```

### cat\src\parser.js

```javascript
const { parseDocument } = require('htmlparser2');
const { determineFileType } = require('./typeof');
const Interpreter = require('./interpreter');

/**
 * Parsing Pipeline Module
 */
const ParsingPipeline = (() => {
  /**
   * Extract wrappers from content using matchAll for better performance and readability
   * @param {string} content - Raw HTML content
   * @returns {Array} - Array of wrapper objects
   */
  const extractWrappers = (content) => {
    const wrapperRegex = /<(\w+(?:-?\w+)*)>([\s\S]*?)<\/\1>/g;
    return Array.from(content.matchAll(wrapperRegex), match => ({
      tag: match[1],
      content: match[2],
    }));
  };


  /**
   * Simplify the DOM structure, removing empty nodes using a recursive approach
   * @param {Array} nodes - Array of DOM nodes
   * @returns {Array} - Simplified array of nodes
   */
  const simplifyDOM = (nodes) =>
    nodes
      .map(node => {
        if (node.type === 'tag') {
          const children = simplifyDOM(node.children);
          const hasAttributes = Object.keys(node.attribs).length > 0;
          if (children.length === 0 && !hasAttributes) return null;
          return {
            type: 'tag',
            name: node.name,
            attributes: node.attribs,
            children,
          };
        }
        if (node.type === 'text') {
          const content = node.data.trim();
          return content ? { type: 'text', content } : null;
        }
        return null;
      })
      .filter(Boolean);


  /**
   * Parse the body content
   * @param {string} bodyContent - The content to parse
   * @returns {Array} - Array of parsed nodes
   */
  const parseBodyContent = (bodyContent) => simplifyDOM(parseDocument(bodyContent, { recognizeSelfClosing: true }).children);


  /**
   * Parse HTML content and extract body, script, and style
   * @param {string} content - Raw HTML content to parse
   * @param {string} fileName - Name of the file being parsed
   * @returns {Object} - Parsed structure with type, body, script, and style
   */
  const parseHTML = (content, fileName) => {
    const wrappers = extractWrappers(content);

    if (wrappers.length > 3) {
      throw new Error(`Invalid structure in ${fileName}. Found ${wrappers.length} wrappers, maximum allowed is 3.`);
    }

    const mainWrappers = wrappers.filter(w => !['script', 'style'].includes(w.tag.toLowerCase()));

    if (mainWrappers.length !== 1) {
      throw new Error(`Invalid structure in ${fileName}. Expected exactly one main wrapper.`);
    }

    const mainWrapper = mainWrappers[0];
    const scriptWrapper = wrappers.find(w => w.tag.toLowerCase() === 'script');
    const styleWrapper = wrappers.find(w => w.tag.toLowerCase() === 'style');

    const script = scriptWrapper ? scriptWrapper.content.trim() : '';
    const style = styleWrapper ? styleWrapper.content.trim() : '';

    const fileType = determineFileType(fileName);
    const body = parseBodyContent(mainWrapper.content);

    return { 
      type: fileType,
      tagName: mainWrapper.tag,
      body,
      script,
      style
    };
  };


  // Public API
  return {
    parseHTML,
  };
})();

module.exports = ParsingPipeline;
```

### cat\src\sinterpreter.js

```javascript
/**
 * ScriptInterpreter Module
 * 
 * This module parses raw JavaScript code related to a component and structures it into a class-friendly format.
 * It organizes global variables, methods, function calls, and event listeners for subsequent compilation steps.
 */

const acorn = require('acorn');
const walk = require('acorn-walk');

/**
 * Class representing a Script Interpreter.
 */
class ScriptInterpreter {
  /**
   * Create a ScriptInterpreter.
   */
  constructor() {
    this.globalVariables = [];
    this.methods = [];
    this.calls = [];
    this.eventListeners = {
      connect: [],
      disconnect: [],
    };
    this.scriptContent = '';
    this.uniqueMethodCounter = 1;
  }

  /**
   * Interpret the provided JavaScript code and extract class components.
   * 
   * @param {string} scriptContent - The raw JavaScript code to interpret.
   * @returns {Object} An object containing extracted global variables, methods, calls, and event listeners.
   * @throws Will throw an error if parsing fails or if a class is detected.
   */
  interpret(scriptContent) {
    this.scriptContent = scriptContent;
    this.globalVariables = [];
    this.methods = [];
    this.calls = [];
    this.eventListeners = {
      connect: [],
      disconnect: [],
    };
    this.uniqueMethodCounter = 1;

    try {
      const ast = acorn.parse(this.scriptContent, {
        ecmaVersion: 'latest',
        sourceType: 'script',
        locations: false,
      });

      // Check for class declarations and expressions
      walk.simple(ast, {
        ClassDeclaration: () => {
          throw new Error('Classes are not supported.');
        },
        ClassExpression: () => {
          throw new Error('Classes are not supported.');
        }
      });

      this.processAst(ast);
      return {
        variables: this.globalVariables,
        methods: this.methods,
        calls: this.calls,
        eventListeners: this.eventListeners,
      };
    } catch (error) {
      throw new Error(`Failed to interpret script: ${error.message}`);
    }
  }

  /**
   * Process the Abstract Syntax Tree (AST) to extract class components.
   * 
   * @param {Object} ast - The AST generated by Acorn.
   */
  processAst(ast) {
    // Only process top-level nodes (global scope)
    ast.body.forEach(node => {
      if (node.type === 'VariableDeclaration') {
        this.processVariableDeclaration(node);
      } else if (node.type === 'FunctionDeclaration') {
        this.processFunctionDeclaration(node);
      } else if (node.type === 'ExpressionStatement') {
        this.processExpressionStatement(node);
      } else if (node.type === 'ImportDeclaration') {
        this.processImportDeclaration(node);
      } else {
        // Ignore other top-level constructs or handle as needed
      }
    });
  }

  /**
   * Process import declarations and treat them as global variables.
   * 
   * @param {Object} node - The ImportDeclaration node.
   */
  processImportDeclaration(node) {
    const code = this.generateCode(node);
    this.globalVariables.push(`${code};`);
  }

  /**
   * Process variable declarations in the global scope.
   * 
   * @param {Object} node - The VariableDeclaration node.
   */
  processVariableDeclaration(node) {
    node.declarations.forEach((decl) => {
      if (decl.init && (decl.init.type === 'ArrowFunctionExpression' || decl.init.type === 'FunctionExpression')) {
        this.processFunctionExpression(decl, node.kind);
      } else {
        this.processGlobalVariable(decl, node.kind);
      }
    });
  }

  /**
   * Process a single global variable declaration.
   * 
   * @param {Object} decl - The VariableDeclarator node.
   * @param {string} kind - The kind of variable declaration (var, let, const).
   */
  processGlobalVariable(decl, kind) {
    const name = decl.id.name;
    const init = decl.init ? this.generateCode(decl.init) : 'undefined';
    // Prefix with 'this.' to assign as a class property
    this.globalVariables.push(`this.${name} = ${init};`);
  }

  /**
   * Process function declarations in the global scope.
   * 
   * @param {Object} node - The FunctionDeclaration node.
   */
  processFunctionDeclaration(node) {
    const name = node.id.name;
    const params = node.params.map(param => this.generateCode(param)).join(', ');
    const body = this.generateCode(node.body).trim();
    this.methods.push(`${name}(${params}) ${body}`);
  }

  /**
   * Process function expressions (including arrow functions) in the global scope as class methods.
   * 
   * @param {Object} decl - The VariableDeclarator node containing the function expression.
   * @param {string} kind - The kind of variable declaration (var, let, const).
   */
  processFunctionExpression(decl, kind) {
    const name = decl.id.name;
    const params = decl.init.params.map(param => this.generateCode(param)).join(', ');
    let methodString = '';

    if (decl.init.type === 'FunctionExpression' || decl.init.type === 'ArrowFunctionExpression') {
      if (decl.init.body.type === 'BlockStatement') {
        const body = this.generateCode(decl.init.body).trim();
        methodString = `${name}(${params}) ${body}`;
      } else {
        // Concise arrow function
        const expression = this.generateCode(decl.init.body).trim();
        methodString = `${name}(${params}) { return ${expression}; }`;
      }
      this.methods.push(methodString);
    }
  }

  /**
   * Process expression statements in the global scope.
   * 
   * @param {Object} node - The ExpressionStatement node.
   */
  processExpressionStatement(node) {
    const expression = node.expression;

    try {
      if (this.isFunctionAssignment(expression)) {
        this.processFunctionAssignment(expression);
      } else if (expression.type === 'CallExpression') {
        if (this.isImmediateFunction(expression)) {
          this.processImmediateFunction(expression);
        } else if (this.isEventListener(expression)) {
          this.processEventListener(expression);
        } else {
          this.processFunctionCall(expression);
        }
      }
    } catch (error) {
      console.error(`Error processing expression statement: ${error.message}`);
    }
  }

  /**
   * Check if an expression is a function assignment (e.g., window.onload = function() {}).
   * 
   * @param {Object} expression - The expression node.
   * @returns {boolean} True if it's a function assignment, false otherwise.
   */
  isFunctionAssignment(expression) {
    return (
      expression.type === 'AssignmentExpression' &&
      (expression.right.type === 'FunctionExpression' || expression.right.type === 'ArrowFunctionExpression')
    );
  }

  /**
   * Process function assignments (e.g., window.onload = function() {}).
   * 
   * @param {Object} expression - The AssignmentExpression node.
   */
  processFunctionAssignment(expression) {
    const left = this.generateCode(expression.left).trim();
    const name = this.generateUniqueMethodName('assignedFunction');
    const params = expression.right.params.map(param => this.generateCode(param)).join(', ');
    let body = '';

    if (expression.right.body.type === 'BlockStatement') {
      body = this.generateCode(expression.right.body).trim();
    } else {
      // Concise arrow function
      const expressionBody = this.generateCode(expression.right.body).trim();
      body = `{ return ${expressionBody}; }`;
    }

    this.methods.push(`${name}(${params}) ${body}`);
    this.calls.push(`${left} = this.${name}.bind(this);`);
  }

  /**
   * Check if a CallExpression node is an event listener.
   * 
   * @param {Object} expression - The CallExpression node.
   * @returns {boolean} True if it's an event listener, false otherwise.
   */
  isEventListener(expression) {
    return (
      expression.callee.type === 'MemberExpression' &&
      expression.callee.property.name === 'addEventListener' &&
      expression.arguments.length >= 2
    );
  }

  /**
   * Process event listeners in the global scope.
   * 
   * @param {Object} expression - The CallExpression node representing the event listener.
   */
  processEventListener(expression) {
    const element = this.generateCode(expression.callee.object).trim();
    const event = this.generateCode(expression.arguments[0]).trim().replace(/^['"]|['"]$/g, '');

    let listener = '';

    if (expression.arguments[1].type === 'FunctionExpression' || expression.arguments[1].type === 'ArrowFunctionExpression') {
      const func = expression.arguments[1];
      const name = this.generateUniqueMethodName('eventListener');
      const params = func.params.map(param => this.generateCode(param)).join(', ');
      let body = '';

      if (func.body.type === 'BlockStatement') {
        body = this.generateCode(func.body).trim();
      } else {
        // Concise arrow function
        const expressionBody = this.generateCode(func.body).trim();
        body = `{ return ${expressionBody}; }`;
      }

      this.methods.push(`${name}(${params}) ${body}`);
      listener = `this.${name}.bind(this)`;
    } else if (expression.arguments[1].type === 'Identifier') {
      // Listener is a named function
      const listenerName = expression.arguments[1].name;
      listener = `this.${listenerName}.bind(this)`;
    } else {
      // Other types (e.g., bound methods)
      listener = this.generateCode(expression.arguments[1]).trim();
    }

    // Attach 'this.' if not already present
    const formattedElement = this.ensureThisPrefix(element);
    
    // Add to 'connect' event listeners
    this.eventListeners.connect.push(`${formattedElement}.addEventListener('${event}', ${listener});`);
    
    // Add corresponding remover to 'disconnect' event listeners
    this.eventListeners.disconnect.push(`${formattedElement}.removeEventListener('${event}', ${listener});`);
  }

  /**
   * Ensures that the given identifier is prefixed with 'this.' if it's not already.
   * 
   * @param {string} identifier - The identifier to check.
   * @returns {string} The identifier with 'this.' prefix if needed.
   */
  ensureThisPrefix(identifier) {
    // If the identifier starts with 'this.', return as is
    if (/^this\./.test(identifier)) {
      return identifier;
    }

    // Otherwise, prefix with 'this.'
    return `this.${identifier}`;
  }

  /**
   * Check if a CallExpression node is an Immediately Invoked Function Expression (IIFE).
   * 
   * @param {Object} expression - The CallExpression node.
   * @returns {boolean} True if it's an IIFE, false otherwise.
   */
  isImmediateFunction(expression) {
    return (
      (expression.callee.type === 'FunctionExpression' || expression.callee.type === 'ArrowFunctionExpression') &&
      // Allow both named and anonymous function expressions
      true
    );
  }

  /**
   * Process Immediately Invoked Function Expressions (IIFE) in the global scope.
   * 
   * @param {Object} expression - The CallExpression node representing the IIFE.
   */
  processImmediateFunction(expression) {
    const name = this.generateUniqueMethodName('immediateFunction');
    let params = '';
    let args = '';
    let body = '';

    if (expression.callee.type === 'FunctionExpression' || expression.callee.type === 'ArrowFunctionExpression') {
      params = expression.callee.params.map(param => this.generateCode(param)).join(', ');
      if (expression.callee.body.type === 'BlockStatement') {
        body = this.generateCode(expression.callee.body).trim();
      } else {
        // Concise arrow function
        const expressionBody = this.generateCode(expression.callee.body).trim();
        body = `{ return ${expressionBody}; }`;
      }
    }

    this.methods.push(`${name}(${params}) ${body}`);
    const callArgs = expression.arguments.map(arg => this.generateCode(arg)).join(', ');
    this.calls.push(`this.${name}(${callArgs});`);
  }

  /**
   * Process function calls in the global scope.
   * 
   * @param {Object} expression - The CallExpression node.
   */
  processFunctionCall(expression) {
    const callExpression = this.generateCode(expression).trim();
    this.calls.push(`${callExpression};`);
  }

  /**
   * Generate unique method names to avoid conflicts.
   * 
   * @param {string} base - The base name for the method.
   * @returns {string} A unique method name.
   */
  generateUniqueMethodName(base) {
    const name = `${base}_${this.uniqueMethodCounter}`;
    this.uniqueMethodCounter += 1;
    return name;
  }

  /**
   * Generate code from an AST node based on its start and end positions.
   * 
   * @param {Object} node - The AST node.
   * @returns {string} The generated code as a string.
   */
  generateCode(node) {
    return this.scriptContent.slice(node.start, node.end);
  }
}

module.exports = ScriptInterpreter;
```

### cat\src\transformer.js

```javascript
/**
 * Transform parsed HTML into JavaScript DOM manipulation code
 * @param {Object} parsedHTML - The parsed HTML structure
 * @returns {string} - JavaScript code to create the DOM structure
 */
function transformToJavaScript(parsedHTML) {
  let code = ``;
  let varCounter = 0;

  function generateVarName() {
    return `el_${varCounter++}`;
  }

  function escapeString(str) {
    return str.replace(/\\/g, `\\\\`).replace(/`/g, `\\\``).replace(/\n/g, `\\n`);
  }

  function transformNode(node, parentVar) {
    let nodeCode = ``;
    const varName = generateVarName();

    if (node.type === `tag` && ![`style`, `script`].includes(node.name)) {
      nodeCode += `const ${varName} = document.createElement(\`${node.name}\`);\n`;
      
      Object.entries(node.attributes).forEach(([attr, value]) => {
        nodeCode += `${varName}.setAttribute(\`${attr}\`, \`${escapeString(value)}\`);\n`;
      });

      node.children.forEach(child => {
        nodeCode += transformNode(child, varName);
      });

    } else if (node.type === `text`) {
      const trimmedContent = node.content.trim();
      if (trimmedContent) {
        nodeCode += `const ${varName} = document.createTextNode(\`${escapeString(trimmedContent)}\`);\n`;
        if (parentVar) {
          nodeCode += `${parentVar}.appendChild(${varName});\n`;
        }
      }
      return nodeCode;
    } else if (node.type === `comment`) {
      nodeCode += `const ${varName} = document.createComment(\`${escapeString(node.data)}\`);\n`;
    } else {
      return ``;
    }

    if (parentVar) {
      nodeCode += `${parentVar}.appendChild(${varName});\n`;
    }

    return nodeCode;
  }

  // Initialize the fragment
  code += `const fragment = document.createDocumentFragment();\n\n`;

  parsedHTML.forEach(node => {
    code += transformNode(node, `fragment`);
  });

  // Return the fragment variable
  code += `\nfragment;`;

  return code.trim();
}

module.exports = { transformToJavaScript };
```

### cat\src\typeof.js

```javascript
/**
 * Determine the type of HTML file based on its name
 * @param {string} fileName - Name of the HTML file
 * @returns {string} - Type of the file ('component', 'page', or 'other')
 */
function determineFileType(fileName) {
  if (fileName.endsWith('.comp.html')) {
    return 'component';
  } else if (fileName.endsWith('.page.html')) {
    return 'page';
  } else {
    return 'other';
  }
}

module.exports = { determineFileType };
```

### Compiled Class:
```
class TodoComp extends HTMLElement {
    /**
     * DocumentFragment shared across all instances.
     * Built once to optimize memory usage.
     */
    _masterFragment = (function() {
        // Build the DOM once
        const fragment = document.createDocumentFragment();

const el_0 = document.createElement(`h2`);
const el_1 = document.createTextNode(`This is a counter`);
el_0.appendChild(el_1);
fragment.appendChild(el_0);
const el_2 = document.createElement(`p`);
const el_3 = document.createTextNode(`When you click, the' counter goes up!`);
el_2.appendChild(el_3);
fragment.appendChild(el_2);
const el_4 = document.createTextNode(`${this.name}`);
fragment.appendChild(el_4);

fragment;
        return fragment;
    })();

    /**
     * Constructor initializes properties.
     */
    constructor() {
        super();
        // Initialize properties
        this.counter = 0;
        this.button = document.querySelector('h1');
        this.name = 'John';
        this.age = 30;
    }

    /**
     * Invoked each time the custom element is appended into a document-connected element.
     */
    connectedCallback() {
        // Clone the master fragment and append to the DOM
        const clonedFragment = TodoComp._masterFragment.cloneNode(true);
        this.appendChild(clonedFragment);

        // Initialize event listeners
        this.button.addEventListener('click', this.eventListener_2.bind(this));

        // Execute any additional function calls
        this.immediateFunction_1();
    }

    /**
     * Invoked each time the custom element is disconnected from the document's DOM.
     */
    disconnectedCallback() {
        // Remove event listeners
        this.button.removeEventListener('click', this.eventListener_2.bind(this));
    }

    increment() { return counter++; }

    greet() {
        let burr = 'd';
        console.log(`Hello, ${name}!`);
    }

    celebrate() {
        age++;
        console.log(`Happy birthday! You are now ${age}`);
    }

    immediateFunction_1() {
        name = name.toUpperCase();
    }

    eventListener_2() {console.log('hello')}
}

customElements.define('todo-comp', TodoComp);
```

Error received:
Uncaught TypeError: Cannot read properties of undefined (reading 'name')
    at (index):90:46
    at <instance_members_initializer> ((index):95:7)
    at new TodoComp ((index):101:9)

---

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