Module System

class Module {
  /** Module type identifier */
  type: string;
  
  /** Module context (directory path) */
  context: string;
  
  /** Module layer (for advanced module organization) */
  layer: string | null;
  
  /** Module needs identifier flag */
  needId: boolean;
  
  /** Debug identifier for the module */
  debugId: number;
  
  /** Hash for module content */
  hash: string | null;
  
  /** Rendered hash for optimization */
  renderedHash: string | null;
  
  /** Build information and metadata */
  buildInfo: Record<string, any>;
  
  /** Build metadata */
  buildMeta: Record<string, any>;
  
  /** Factory metadata */
  factoryMeta: Record<string, any>;
  
  /**
   * Get unique identifier for the module
   * @param context - Module context information
   * @returns Unique string identifier
   */
  identifier(): string;
  
  /**
   * Get readable identifier for debugging
   * @param requestShortener - Function to shorten request strings
   * @returns Human-readable identifier
   */
  readableIdentifier(requestShortener: RequestShortener): string;
  
  /**
   * Build the module from source
   * @param options - Build options and context
   * @param compilation - Current compilation instance
   * @param resolver - Module resolver
   * @param fs - File system interface
   * @param callback - Completion callback
   */
  build(
    options: WebpackOptionsNormalized,
    compilation: Compilation,
    resolver: ResolverWithOptions,
    fs: InputFileSystem,
    callback: (err?: Error | null) => void
  ): void;
  
  /**
   * Get module size in bytes
   * @param type - Source type to measure
   * @returns Size in bytes
   */
  size(type?: string): number;
  
  /**
   * Update hash with module content
   * @param hash - Hash instance to update
   * @param context - Hash update context
   */
  updateHash(hash: Hash, context: UpdateHashContext): void;
}

// Custom module implementation
class CustomModule extends Module {
  constructor(resource) {
    super("custom", resource);
    this.resource = resource;
  }
  
  identifier() {
    return `custom ${this.resource}`;
  }
  
  readableIdentifier(requestShortener) {
    return `custom ${requestShortener(this.resource)}`;
  }
  
  size() {
    return 42; // Custom size calculation
  }
}

class NormalModule extends Module {
  /** Module request string */
  request: string;
  
  /** User request (original import/require) */
  userRequest: string;
  
  /** Raw request before resolution */
  rawRequest: string;
  
  /** Resolved resource path */
  resource: string;
  
  /** Resource path with query and fragment */
  resourceResolveData: ResourceResolveData;
  
  /** Matched loaders for this module */
  loaders: LoaderItem[];
  
  /** Parser instance for this module */
  parser: Parser;
  
  /** Generator instance for code generation */
  generator: Generator;
  
  /** Source of the module */
  _source: Source | null;
  
  /** Source map for the module */
  _sourceMap: SourceMap | null;
  
  /**
   * Create a new NormalModule
   * @param options - Module creation options
   */
  constructor(options: NormalModuleCreateData);
  
  /**
   * Get loaders with their options
   * @param compilation - Current compilation
   * @returns Array of loader configurations
   */
  getCurrentLoader(compilation: Compilation): LoaderItem | null;
  
  /**
   * Create source for this module
   * @param dependencyTemplates - Dependency templates
   * @param runtimeTemplate - Runtime template
   * @param type - Source type
   * @returns Generated source
   */
  source(
    dependencyTemplates: DependencyTemplates,
    runtimeTemplate: RuntimeTemplate,
    type?: string
  ): Source;
  
  /**
   * Get original source from loaders
   * @returns Original source
   */
  originalSource(): Source | null;
}

// Creating a NormalModule programmatically
const normalModule = new NormalModule({
  type: "javascript/auto",
  request: "babel-loader!./src/component.js",
  userRequest: "./src/component.js",
  rawRequest: "./src/component.js",
  loaders: [{
    loader: "babel-loader",
    options: {}
  }],
  resource: "/path/to/src/component.js",
  resourceResolveData: {},
  context: "/path/to/project",
  layer: null
});

class ExternalModule extends Module {
  /** External module request */
  request: string;
  
  /** External type (e.g., "var", "commonjs", "amd") */
  externalType: string;
  
  /** User request string */
  userRequest: string;
  
  /** Whether this is optional */
  optional: boolean;
  
  /**
   * Create an external module
   * @param request - External module identifier
   * @param type - External module type
   * @param userRequest - Original user request
   */
  constructor(request: string, type: string, userRequest: string);
  
  /**
   * Get external item for code generation
   * @param dependencyTemplates - Dependency templates
   * @param runtimeTemplate - Runtime template
   * @returns External item configuration
   */
  getSourceForGlobalVariableExternal(
    variableName: string,
    type: string
  ): Source;
}

// External module for React (not bundled)
const reactExternal = new ExternalModule(
  "React", 
  "var", 
  "react"
);

// External CommonJS module
const lodashExternal = new ExternalModule(
  "lodash",
  "commonjs",
  "lodash"
);

class DelegatedModule extends Module {
  /** Source request for the delegate */
  sourceRequest: string;
  
  /** Request in the delegated scope */
  request: string;
  
  /** Delegation scope */
  delegationType: string;
  
  /** User request string */
  userRequest: string;
  
  /** Original module reference */
  originalRequest: string;
  
  /**
   * Create a delegated module
   * @param sourceRequest - Source request string
   * @param data - Delegation data
   */
  constructor(sourceRequest: string, data: DelegatedModuleData);
  
  /**
   * Get delegated source
   * @param dependencyTemplates - Dependency templates
   * @param runtimeTemplate - Runtime template
   * @returns Generated source
   */
  source(
    dependencyTemplates: DependencyTemplates,
    runtimeTemplate: RuntimeTemplate
  ): Source;
}

// DLL module reference
const dllModule = new DelegatedModule("dll-reference vendor", {
  type: "require",
  request: "./node_modules/react/index.js"
});

class RuntimeModule extends Module {
  /** Runtime module name */
  name: string;
  
  /** Stage for runtime module execution */
  stage: number;
  
  /** Whether this module is cacheable */
  cacheable: boolean;
  
  /** Fresh flag for cache invalidation */
  fresh: boolean;
  
  /**
   * Create a runtime module
   * @param name - Runtime module name
   * @param stage - Execution stage
   */
  constructor(name: string, stage?: number);
  
  /**
   * Generate runtime code
   * @returns Runtime source code
   */
  generate(): Source | null;
  
  /**
   * Get runtime requirements
   * @returns Set of runtime requirements
   */
  getGeneratedRuntimeRequirements(): ReadonlySet<string>;
  
  /**
   * Attach to chunk
   * @param chunk - Target chunk
   */
  attach(compilation: Compilation, chunk: Chunk, chunkGraph: ChunkGraph): void;
}

// Custom runtime module
class CustomRuntimeModule extends RuntimeModule {
  constructor() {
    super("custom-runtime", 0);
  }
  
  generate() {
    return new RawSource(`
      // Custom runtime code
      __webpack_require__.custom = function() {
        return "custom functionality";
      };
    `);
  }
}

class ModuleGraph {
  /** 
   * Set parent module for a dependency
   * @param dependency - The dependency
   * @param parentModule - Parent module containing the dependency
   */
  setParents(
    dependency: Dependency, 
    parentModule: Module, 
    parentBlock?: DependenciesBlock
  ): void;
  
  /**
   * Get parent module of a dependency
   * @param dependency - The dependency
   * @returns Parent module or null
   */
  getParentModule(dependency: Dependency): Module | null;
  
  /**
   * Set resolved module for a dependency
   * @param originModule - Module containing the dependency
   * @param dependency - The dependency
   * @param module - Resolved target module
   */
  setResolvedModule(
    originModule: Module,
    dependency: Dependency,
    module: Module
  ): void;
  
  /**
   * Update module with new instance
   * @param dependency - The dependency
   * @param module - New module instance
   */
  updateModule(dependency: Dependency, module: Module): void;
  
  /**
   * Remove connection between modules
   * @param dependency - The dependency to remove
   */
  removeConnection(dependency: Dependency): void;
  
  /**
   * Get module resolved by dependency
   * @param dependency - The dependency
   * @returns Resolved module or null
   */
  getModule(dependency: Dependency): Module | null;
  
  /**
   * Get connection information
   * @param dependency - The dependency
   * @returns Connection details or undefined
   */
  getConnection(dependency: Dependency): ModuleGraphConnection | undefined;
  
  /**
   * Get all outgoing connections from a module
   * @param module - Source module
   * @returns Iterable of connections
   */
  getOutgoingConnections(module: Module): Iterable<ModuleGraphConnection>;
  
  /**
   * Get all incoming connections to a module
   * @param module - Target module
   * @returns Iterable of connections
   */
  getIncomingConnections(module: Module): Iterable<ModuleGraphConnection>;
  
  /**
   * Get profile information for a module
   * @param module - The module
   * @returns Module profile or null
   */
  getProfile(module: Module): ModuleProfile | null;
  
  /**
   * Set profile for a module
   * @param module - The module
   * @param profile - Profile information
   */
  setProfile(module: Module, profile: ModuleProfile | null): void;
}

// Working with module graph
const moduleGraph = compilation.moduleGraph;

// Get dependencies of a module
const connections = moduleGraph.getOutgoingConnections(module);
for (const connection of connections) {
  console.log(`${module.identifier()} depends on ${connection.module.identifier()}`);
}

// Find modules that depend on a specific module
const incomingConnections = moduleGraph.getIncomingConnections(targetModule);
for (const connection of incomingConnections) {
  console.log(`${connection.originModule.identifier()} uses ${targetModule.identifier()}`);
}

class ChunkGraph {
  /**
   * Connect chunk and module
   * @param chunk - The chunk
   * @param module - The module
   */
  connectChunkAndModule(chunk: Chunk, module: Module): void;
  
  /**
   * Disconnect chunk and module
   * @param chunk - The chunk
   * @param module - The module
   */
  disconnectChunkAndModule(chunk: Chunk, module: Module): void;
  
  /**
   * Disconnect chunk from all modules
   * @param chunk - The chunk to disconnect
   */
  disconnectChunk(chunk: Chunk): void;
  
  /**
   * Attach runtime modules to chunk
   * @param chunk - Target chunk
   * @param module - Runtime module to attach
   */
  attachRuntimeModules(chunk: Chunk, modules: Iterable<RuntimeModule>): void;
  
  /**
   * Attach full hash modules to chunk
   * @param chunk - Target chunk
   * @param modules - Modules requiring full hash
   */
  attachFullHashModules(chunk: Chunk, modules: Iterable<RuntimeModule>): void;
  
  /**
   * Replace module in chunk
   * @param oldModule - Module to replace
   * @param newModule - Replacement module
   */
  replaceModule(oldModule: Module, newModule: Module): void;
  
  /**
   * Check if module is in chunk
   * @param module - The module
   * @param chunk - The chunk
   * @returns True if module is in chunk
   */
  isModuleInChunk(module: Module, chunk: Chunk): boolean;
  
  /**
   * Get modules in chunk
   * @param chunk - The chunk
   * @returns Iterable of modules
   */
  getChunkModules(chunk: Chunk): Iterable<Module>;
  
  /**
   * Get ordered chunk modules
   * @param chunk - The chunk
   * @param comparator - Module comparison function
   * @returns Ordered array of modules
   */
  getOrderedChunkModules(
    chunk: Chunk, 
    comparator: (a: Module, b: Module) => number
  ): Module[];
  
  /**
   * Get chunks containing module
   * @param module - The module
   * @returns Iterable of chunks
   */
  getModuleChunks(module: Module): Iterable<Chunk>;
  
  /**
   * Get number of chunk modules
   * @param chunk - The chunk
   * @returns Module count
   */
  getNumberOfChunkModules(chunk: Chunk): number;
  
  /**
   * Get chunk graph module
   * @param module - The module
   * @returns Chunk graph module data
   */
  getChunkGraphModule(module: Module): ChunkGraphModule;
  
  /**
   * Get module ID in chunk
   * @param module - The module
   * @param chunk - The chunk
   * @returns Module ID or null
   */
  getModuleId(module: Module): string | number | null;
  
  /**
   * Set module ID
   * @param module - The module
   * @param id - ID to assign
   */
  setModuleId(module: Module, id: string | number): void;
  
  /**
   * Get runtime requirements for chunk
   * @param chunk - The chunk
   * @returns Set of runtime requirements
   */
  getChunkRuntimeRequirements(chunk: Chunk): ReadonlySet<string>;
  
  /**
   * Add chunk runtime requirements
   * @param chunk - The chunk
   * @param requirements - Runtime requirements to add
   */
  addChunkRuntimeRequirements(
    chunk: Chunk, 
    requirements: Iterable<string>
  ): void;
}

// Working with chunk graph
const chunkGraph = compilation.chunkGraph;

// Add module to chunk
chunkGraph.connectChunkAndModule(chunk, module);

// Get all modules in a chunk
const modules = chunkGraph.getChunkModules(entryChunk);
for (const module of modules) {
  console.log(`Chunk contains: ${module.identifier()}`);
}

// Find which chunks contain a module
const chunks = chunkGraph.getModuleChunks(module);
for (const chunk of chunks) {
  console.log(`Module is in chunk: ${chunk.name || chunk.id}`);
}

class Chunk {
  /** Chunk identifier */
  id: string | number | null;
  
  /** Chunk IDs (can have multiple) */
  ids: (string | number)[] | null;
  
  /** Debug ID for development */
  debugId: number;
  
  /** Chunk name */
  name: string | null;
  
  /** ID name mapping */
  idNameHints: Set<string>;
  
  /** Whether chunk prevents integration */
  preventIntegration: boolean;
  
  /** Files generated by this chunk */
  files: Set<string>;
  
  /** Auxiliary files */
  auxiliaryFiles: Set<string>;
  
  /** Runtime requirements */
  runtime: RuntimeSpec;
  
  /** Chunk hash */
  hash: string | null;
  
  /** Content hash by type */
  contentHash: Record<string, string>;
  
  /** Rendered hash */
  renderedHash: string | null;
  
  /** Chunk reason for creation */
  chunkReason: string | null;
  
  /**
   * Create a new chunk
   * @param name - Optional chunk name
   */
  constructor(name?: string);
  
  /**
   * Check if chunk has entry module
   * @returns True if chunk is an entry chunk
   */
  hasEntryModule(): boolean;
  
  /**
   * Add group to chunk
   * @param chunkGroup - Chunk group to add
   */
  addGroup(chunkGroup: ChunkGroup): void;
  
  /**
   * Remove group from chunk
   * @param chunkGroup - Chunk group to remove
   */
  removeGroup(chunkGroup: ChunkGroup): void;
  
  /**
   * Check if chunk is in group
   * @param chunkGroup - Chunk group to check
   * @returns True if chunk is in group
   */
  isInGroup(chunkGroup: ChunkGroup): boolean;
  
  /**
   * Get number of groups
   * @returns Group count
   */
  getNumberOfGroups(): number;
  
  /**
   * Get all chunk groups
   * @returns Iterable of chunk groups
   */
  groupsIterable: Iterable<ChunkGroup>;
  
  /**
   * Compare chunks for sorting
   * @param otherChunk - Chunk to compare with
   * @returns Comparison result
   */
  compareTo(otherChunk: Chunk): number;
  
  /**
   * Check if chunk contains module
   * @param module - Module to check
   * @returns True if chunk contains module
   */
  containsModule(module: Module): boolean;
  
  /**
   * Get chunk modules
   * @returns Iterable of modules
   */
  modulesIterable: Iterable<Module>;
  
  /**
   * Get chunk size
   * @param options - Size calculation options
   * @returns Chunk size
   */
  size(options?: ChunkSizeOptions): number;
  
  /**
   * Get integrated size
   * @param otherChunk - Chunk to integrate with
   * @param options - Size options
   * @returns Integrated size
   */
  integratedSize(otherChunk: Chunk, options: ChunkSizeOptions): number;
  
  /**
   * Check if chunk can be integrated
   * @param otherChunk - Chunk to check integration with
   * @returns True if chunks can be integrated
   */
  canBeIntegrated(otherChunk: Chunk): boolean;
  
  /**
   * Integrate with other chunk
   * @param otherChunk - Chunk to integrate
   * @returns True if integration was successful
   */
  integrate(otherChunk: Chunk): boolean;
  
  /**
   * Check if chunk can be initial
   * @returns True if chunk can be initial
   */
  canBeInitial(): boolean;
  
  /**
   * Check if chunk is only initial
   * @returns True if chunk is only initial
   */
  isOnlyInitial(): boolean;
  
  /**
   * Get chunk hash based on modules
   * @param chunkGraph - Chunk graph instance
   * @returns Chunk hash
   */
  getChunkMaps(chunkGraph: ChunkGraph): ChunkMaps;
}

// Create and configure a chunk
const chunk = new Chunk("my-chunk");
chunk.name = "vendor";
chunk.chunkReason = "split vendor code";

// Check chunk properties
if (chunk.hasEntryModule()) {
  console.log("This is an entry chunk");
}

// Get chunk size
const sizeOptions = { chunkOverhead: 10000, entryChunkMultiplicator: 10 };
const size = chunk.size(sizeOptions);
console.log(`Chunk size: ${size} bytes`);

class ChunkGroup {
  /** Group options */
  groupDebugId: number;
  
  /** Group options */
  options: ChunkGroupOptions;
  
  /** Chunks in this group */
  _chunks: Chunk[];
  
  /** Parent groups */
  _parents: Set<ChunkGroup>;
  
  /** Children groups */
  _children: Set<ChunkGroup>;
  
  /** Async chunks */
  _asyncEntrypoints: Set<ChunkGroup>;
  
  /** Block origins */
  _origins: OriginRecord[];
  
  /**
   * Create chunk group
   * @param options - Group configuration options
   */
  constructor(options?: ChunkGroupOptions);
  
  /**
   * Add chunk to group
   * @param chunk - Chunk to add
   * @returns True if chunk was added
   */
  insertChunk(chunk: Chunk, before?: Chunk): boolean;
  
  /**
   * Remove chunk from group
   * @param chunk - Chunk to remove
   * @returns True if chunk was removed
   */
  removeChunk(chunk: Chunk): boolean;
  
  /**
   * Check if group is initial
   * @returns True if initial group
   */
  isInitial(): boolean;
  
  /**
   * Add child group
   * @param child - Child group to add
   * @returns True if child was added
   */
  addChild(child: ChunkGroup): boolean;
  
  /**
   * Get children groups
   * @returns Array of child groups
   */
  getChildren(): ChunkGroup[];
  
  /**
   * Get parent groups
   * @returns Array of parent groups
   */
  getParents(): ChunkGroup[];
  
  /**
   * Add parent group
   * @param parent - Parent group to add
   * @returns True if parent was added
   */
  addParent(parent: ChunkGroup): boolean;
  
  /**
   * Remove parent group
   * @param parent - Parent group to remove
   */
  removeParent(parent: ChunkGroup): void;
  
  /**
   * Remove child group
   * @param child - Child group to remove
   */
  removeChild(child: ChunkGroup): void;
  
  /**
   * Get all chunks in group
   * @returns Array of chunks
   */
  getChunks(): Chunk[];
  
  /**
   * Get number of chunks
   * @returns Chunk count
   */
  getNumberOfChunks(): number;
  
  /**
   * Check if group has chunk
   * @param chunk - Chunk to check
   * @returns True if group has chunk
   */
  hasChunk(chunk: Chunk): boolean;
  
  /**
   * Compare chunk groups
   * @param otherGroup - Group to compare with
   * @returns Comparison result
   */
  compareTo(otherGroup: ChunkGroup): number;
  
  /**
   * Get module pre order index
   * @param module - Module to get index for
   * @returns Pre order index
   */
  getModulePreOrderIndex(module: Module): number | null;
  
  /**
   * Get module post order index
   * @param module - Module to get index for
   * @returns Post order index
   */
  getModulePostOrderIndex(module: Module): number | null;
  
  /**
   * Set module pre order index
   * @param module - Module to set index for
   * @param index - Index value
   */
  setModulePreOrderIndex(module: Module, index: number): boolean;
  
  /**
   * Set module post order index
   * @param module - Module to set index for
   * @param index - Index value
   */
  setModulePostOrderIndex(module: Module, index: number): boolean;
}

// Create chunk group for vendor libraries
const vendorGroup = new ChunkGroup({
  name: "vendor"
});

// Add chunks to group
vendorGroup.insertChunk(vendorChunk);
vendorGroup.insertChunk(runtimeChunk);

// Set up parent-child relationships
vendorGroup.addChild(asyncGroup);
mainGroup.addChild(vendorGroup);

class Entrypoint extends ChunkGroup {
  /** Entry options */
  options: EntrypointOptions;
  
  /** Runtime chunk */
  _runtimeChunk: Chunk | null;
  
  /** Entry module */
  _entrypointChunk: Chunk | null;
  
  /**
   * Create entrypoint
   * @param options - Entry configuration
   */
  constructor(options: EntrypointOptions);
  
  /**
   * Check if this is an entrypoint
   * @returns Always true for Entrypoint
   */
  isInitial(): boolean;
  
  /**
   * Set runtime chunk
   * @param chunk - Runtime chunk
   */
  setRuntimeChunk(chunk: Chunk): void;
  
  /**
   * Get runtime chunk
   * @returns Runtime chunk or null
   */
  getRuntimeChunk(): Chunk | null;
  
  /**
   * Set entrypoint chunk  
   * @param chunk - Entrypoint chunk
   */
  setEntrypointChunk(chunk: Chunk): void;
  
  /**
   * Get entrypoint chunk
   * @returns Entrypoint chunk or null
   */
  getEntrypointChunk(): Chunk | null;
  
  /**
   * Replace chunk in entrypoint
   * @param oldChunk - Chunk to replace
   * @param newChunk - Replacement chunk
   */
  replaceChunk(oldChunk: Chunk, newChunk: Chunk): boolean;
}

// Create application entrypoint
const mainEntry = new Entrypoint({
  name: "main"
});

// Set up entry and runtime chunks
mainEntry.setEntrypointChunk(entryChunk);
mainEntry.setRuntimeChunk(runtimeChunk);

// Add to compilation
compilation.entrypoints.set("main", mainEntry);

class Dependency {
  /** Dependency type */
  type: string;
  
  /** Category for grouping */
  category: string;
  
  /** Location in source code */
  loc: SourceLocation | null;
  
  /** Weak dependency flag */
  weak: boolean;
  
  /** Optional dependency flag */
  optional: boolean;
  
  /**
   * Get dependency type
   * @returns Dependency type string
   */
  getType(): string;
  
  /**
   * Get dependency category
   * @returns Category string
   */
  getCategory(): string;
  
  /**
   * Get reference exports
   * @param moduleGraph - Module graph instance
   * @param runtime - Runtime information
   * @returns Export references
   */
  getReferencedExports(
    moduleGraph: ModuleGraph,
    runtime: RuntimeSpec
  ): (string[] | ReferencedExport)[] | null;
  
  /**
   * Get resource identifier
   * @returns Resource identifier or null
   */
  getResourceIdentifier(): string | null;
  
  /**
   * Get module evaluation side effects
   * @param moduleGraph - Module graph instance
   * @returns Side effects flag
   */
  getModuleEvaluationSideEffectsState(
    moduleGraph: ModuleGraph
  ): ConnectionState;
  
  /**
   * Create hash of dependency
   * @param hash - Hash instance
   */
  updateHash(hash: Hash): void;
  
  /**
   * Serialize dependency
   * @param context - Serialization context
   */
  serialize(context: ObjectSerializerContext): void;
  
  /**
   * Deserialize dependency
   * @param context - Deserialization context
   */
  deserialize(context: ObjectDeserializerContext): void;
}

class ModuleDependency extends Dependency {
  /** Module request string */
  request: string;
  
  /** User request (original) */
  userRequest: string;
  
  /** Request range in source */
  range: [number, number] | null;
  
  /**
   * Create module dependency
   * @param request - Module request string
   */
  constructor(request: string);
  
  /**
   * Get request string
   * @returns Request string
   */
  getRequest(): string;
  
  /**
   * Get condition for module evaluation
   * @param moduleGraph - Module graph instance
   * @returns Connection state
   */
  getCondition(moduleGraph: ModuleGraph): ConnectionState | null;
}

class HarmonyImportDependency extends ModuleDependency {
  /** Import source range */
  sourceOrder: number;
  
  /** Parser scope */
  parserScope: any;
  
  /**
   * Create harmony import dependency
   * @param request - Import request
   * @param sourceOrder - Source order number
   * @param parserScope - Parser scope information
   */
  constructor(request: string, sourceOrder: number, parserScope?: any);
  
  /**
   * Get import variable
   * @returns Import variable name
   */
  getImportVar(moduleGraph: ModuleGraph): string;
  
  /**
   * Get imported module
   * @param moduleGraph - Module graph instance
   * @returns Imported module or null
   */
  getImportedModule(moduleGraph: ModuleGraph): Module | null;
}

class ConstDependency extends Dependency {
  /** Expression to replace */
  expression: string;
  
  /** Range to replace */
  range: [number, number] | null;
  
  /** Runtime requirements */
  runtimeRequirements: Set<string> | null;
  
  /**
   * Create const dependency
   * @param expression - Replacement expression
   * @param range - Source range to replace
   * @param runtimeRequirements - Runtime requirements
   */
  constructor(
    expression: string, 
    range?: [number, number] | null,
    runtimeRequirements?: string[]
  );
  
  /**
   * Update hash with expression
   * @param hash - Hash instance
   */
  updateHash(hash: Hash): void;
}

class NullDependency extends Dependency {
  /**
   * Create null dependency
   */
  constructor();
  
  /**
   * Compare with other dependency
   * @param other - Other dependency
   * @returns True if equal
   */
  compare(other: Dependency): boolean;
}

// Create module dependency
const moduleDep = new ModuleDependency("./utils/helper");
moduleDep.range = [10, 30]; // Character range in source

// ES6 import dependency
const importDep = new HarmonyImportDependency(
  "./components/Button", 
  0, 
  parserScope
);

// Constant replacement
const constDep = new ConstDependency(
  '"production"', 
  [45, 60], 
  [RuntimeGlobals.require]
);

// Add dependencies to module
module.addDependency(moduleDep);
module.addDependency(importDep);
module.addDependency(constDep);

class ModuleFactory {
  /**
   * Create module from dependency
   * @param data - Module creation data
   * @param callback - Completion callback
   */
  create(
    data: ModuleFactoryCreateData,
    callback: (err?: Error, result?: ModuleFactoryResult) => void
  ): void;
}

class NormalModuleFactory extends ModuleFactory {
  /** Resolver for modules */
  resolverFactory: ResolverFactory;
  
  /** Rule set for matching loaders */
  ruleSet: RuleSet;
  
  /** Context for resolution */
  context: string;
  
  /** File system interface */
  fs: InputFileSystem;
  
  /** Factory hooks */
  hooks: NormalModuleFactoryHooks;
  
  /**
   * Create normal module factory
   * @param options - Factory options
   */
  constructor(options: NormalModuleFactoryOptions);
  
  /**
   * Create module from request
   * @param data - Creation data including context and dependencies
   * @param callback - Module creation callback
   */
  create(
    data: ModuleFactoryCreateData,
    callback: (err?: Error, result?: NormalModuleFactoryResult) => void
  ): void;
  
  /**
   * Resolve module request
   * @param contextInfo - Context information
   * @param context - Base context path
   * @param request - Module request string
   * @param resolveOptions - Resolution options
   * @param callback - Resolution callback
   */
  resolveRequestArray(
    contextInfo: ModuleFactoryCreateDataContextInfo,
    context: string,
    request: string,
    resolveOptions: ResolveOptionsWithDependencyType,
    callback: (err?: Error, result?: any[]) => void
  ): void;
}

class ContextModuleFactory extends ModuleFactory {
  /** Resolver factory */
  resolverFactory: ResolverFactory;
  
  /**
   * Create context module factory
   * @param resolverFactory - Resolver factory instance
   */
  constructor(resolverFactory: ResolverFactory);
  
  /**
   * Create context module
   * @param data - Context creation data
   * @param callback - Creation callback
   */
  create(
    data: ModuleFactoryCreateData,
    callback: (err?: Error, result?: ContextModuleFactoryResult) => void
  ): void;
}

// Using normal module factory
const normalModuleFactory = compilation.dependencyFactories.get(Dependency);

const createData = {
  contextInfo: {
    issuer: "/path/to/issuer.js"
  },
  context: "/path/to/context",
  dependencies: [dependency]
};

normalModuleFactory.create(createData, (err, result) => {
  if (err) {
    console.error("Module creation failed:", err);
    return;
  }
  
  const module = result.module;
  console.log("Created module:", module.identifier());
});

class Parser {
  /**
   * Parse module source
   * @param source - Module source code
   * @param state - Parser state
   * @returns Parser result
   */
  parse(source: string | Buffer, state: ParserState): ParserResult;
}

// JavaScript parser extracts dependencies
const parser = new JavascriptParser("auto");

// Parse result contains AST and dependencies
const result = parser.parse(source, {
  current: normalModule,
  module: normalModule,
  compilation: compilation,
  options: compilation.options
});

class Generator {
  /**
   * Generate code for module
   * @param module - Module to generate code for
   * @param generateContext - Generation context
   * @returns Generated source
   */
  generate(module: Module, generateContext: GenerateContext): Source;
  
  /**
   * Get concatenation bailout reason
   * @param module - Module to check
   * @param generateContext - Generation context
   * @returns Bailout reason or undefined
   */
  getConcatenationBailoutReason(
    module: Module, 
    generateContext: GenerateContext
  ): string | undefined;
  
  /**
   * Update hash with generator state
   * @param hash - Hash instance
   * @param generateContext - Generation context
   */
  updateHash(hash: Hash, generateContext: GenerateContext): void;
}

// JavaScript generator creates output code
const generator = new JavascriptGenerator();

const source = generator.generate(module, {
  dependencyTemplates,
  runtimeTemplate,
  moduleGraph,
  chunkGraph,
  runtimeRequirements,
  runtime,
  type: "javascript"
});

// Module type constants
const MODULE_TYPE = {
  JAVASCRIPT_AUTO: "javascript/auto",
  JAVASCRIPT_DYNAMIC: "javascript/dynamic", 
  JAVASCRIPT_ESM: "javascript/esm",
  JSON: "json",
  WEBASSEMBLY_SYNC: "webassembly/sync",
  WEBASSEMBLY_ASYNC: "webassembly/async",
  ASSET_RESOURCE: "asset/resource",
  ASSET_INLINE: "asset/inline",
  ASSET: "asset",
  RUNTIME: "runtime"
};

// Dependency categories
const DEPENDENCY_CATEGORY = {
  ESM: "esm",
  COMMONJS: "commonjs", 
  AMD: "amd",
  REQUIRE_CONTEXT: "require.context",
  WORKER: "worker",
  URL: "url"
};

// Connection states for dependencies
const CONNECTION_STATE = {
  BOOL_TRUE: true,
  BOOL_FALSE: false,
  CIRCULAR_CONNECTION: Symbol("circular connection"),
  TRANSITIVE_CONNECTION: Symbol("transitive connection")
};

// Custom module factory
class CustomModuleFactory extends ModuleFactory {
  create(data, callback) {
    const { context, dependencies } = data;
    const dependency = dependencies[0];
    
    // Create custom module based on request pattern
    if (dependency.request.startsWith("custom:")) {
      const module = new CustomModule(dependency.request);
      callback(null, { module });
    } else {
      callback(new Error("Invalid custom module request"));
    }
  }
}

// Register factory in compilation
compilation.dependencyFactories.set(CustomDependency, customModuleFactory);

// Analyze module relationships
function analyzeModuleGraph(compilation) {
  const moduleGraph = compilation.moduleGraph;
  const modules = compilation.modules;
  
  const analysis = {
    totalModules: modules.size,
    circularDependencies: [],
    largestModules: [],
    dependencyDepth: new Map()
  };
  
  // Find circular dependencies
  for (const module of modules) {
    const visited = new Set();
    if (hasCycle(module, moduleGraph, visited)) {
      analysis.circularDependencies.push(module);
    }
  }
  
  // Calculate dependency depths
  for (const module of modules) {
    analysis.dependencyDepth.set(
      module, 
      calculateDepth(module, moduleGraph)
    );
  }
  
  return analysis;
}

function hasCycle(module, moduleGraph, visited, path = new Set()) {
  if (path.has(module)) return true;
  if (visited.has(module)) return false;
  
  visited.add(module);
  path.add(module);
  
  const connections = moduleGraph.getOutgoingConnections(module);
  for (const connection of connections) {
    if (connection.module && hasCycle(connection.module, moduleGraph, visited, path)) {
      return true;
    }
  }
  
  path.delete(module);
  return false;
}

// Custom chunk splitting strategy
class CustomChunkSplitter {
  apply(compiler) {
    compiler.hooks.compilation.tap("CustomChunkSplitter", (compilation) => {
      compilation.hooks.optimizeChunks.tap("CustomChunkSplitter", (chunks) => {
        const chunkGraph = compilation.chunkGraph;
        
        // Split large chunks
        for (const chunk of chunks) {
          const modules = chunkGraph.getChunkModules(chunk);
          const moduleArray = Array.from(modules);
          
          if (moduleArray.length > 50) {
            const newChunk = compilation.addChunk(`${chunk.name}-split`);
            const halfSize = Math.floor(moduleArray.length / 2);
            
            // Move half the modules to new chunk
            for (let i = halfSize; i < moduleArray.length; i++) {
              chunkGraph.disconnectChunkAndModule(chunk, moduleArray[i]);
              chunkGraph.connectChunkAndModule(newChunk, moduleArray[i]);
            }
          }
        }
      });
    });
  }
}

// Custom runtime functionality
class CustomRuntimeModule extends RuntimeModule {
  constructor() {
    super("custom-loader", RuntimeModule.STAGE_NORMAL);
  }
  
  generate() {
    return new RawSource(`
      // Custom runtime functionality
      __webpack_require__.customLoader = function(moduleId) {
        console.log('Loading module:', moduleId);
        return __webpack_require__(moduleId);
      };
      
      // Add custom module cache
      __webpack_require__.customCache = Object.create(null);
    `);
  }
  
  getGeneratedRuntimeRequirements() {
    return new Set([RuntimeGlobals.require, RuntimeGlobals.moduleCache]);
  }
}

// Add to compilation
compilation.addRuntimeModule(chunk, new CustomRuntimeModule());