function preprocessAliases(ast) {
  // Create a symbol table to track what each variable references
  const symbolTable = new Map();
  const MAX_ITERATIONS = 5;
  let iterations = 0;
  
  // Keep preprocessing until no more changes can be made
  let changesMade;
  do {
    changesMade = false;
    
    // First pass: Identify all variables
    findVariableDefinitions(ast, symbolTable);
    
    // Second pass: Replace all variable references with their resolved values
    changesMade = resolveVariableReferences(ast, symbolTable) || false;
    
    // Third pass: Clean up variable declarations that are no longer needed
    changesMade = removeResolvedDeclarations(ast, symbolTable) || false;

    iterations++;
    
  } while (changesMade && iterations < MAX_ITERATIONS);
}
Preprocess all variable aliases in the AST to simplify later transformations
@param {Object} ast - jscodeshift AST