# All files / src/classify file-classifiers.ts

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75% Branches 84/112
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     import { DependencyNode } from '../types';
    import {
      BARREL_EXPORT_MIN_EXPORTS,
      BARREL_EXPORT_TOKEN_LIMIT,
      HANDLER_NAME_PATTERNS,
      SERVICE_NAME_PATTERNS,
      EMAIL_NAME_PATTERNS,
      PARSER_NAME_PATTERNS,
      SESSION_NAME_PATTERNS,
      NEXTJS_METADATA_EXPORTS,
      CONFIG_NAME_PATTERNS,
    } from './classification-patterns';

    /**
     * Detect if a file is a boilerplate barrel (architectural theater).
     * A boilerplate barrel re-exports from other sources without adding value.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file matches boilerplate barrel patterns.
     */
    export function isBoilerplateBarrel(node: DependencyNode): boolean {
      const { exports, tokenCost } = node;
      Iif (!exports || exports.length === 0) return false;

      // 1. Must be purely re-exports
      const isPurelyReexports = exports.every((exp: any) => !!exp.source);
      if (!isPurelyReexports) return false;

      // 2. Must be low local token cost (no actual logic)
      Iif (tokenCost > 500) return false;

      // 3. Detect "Architectural Theater"
      // If it re-exports everything from exactly ONE source, it's a pass-through
      const sources = new Set(exports.map((exp: any) => exp.source));

      // Pattern: export * from '../actual'
      const isSingleSourcePassThrough = sources.size === 1;

      // Pattern: multi-file 1-to-1 re-exports that don't aggregate much
      // (e.g., 6 files each re-exporting from exactly one other file)
      const isMeaninglessAggregation = sources.size > 0 && sources.size < 3;

      return isSingleSourcePassThrough || isMeaninglessAggregation;
    }

    /**
     * Detect if a file is a barrel export (index.ts).
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file matches barrel export patterns.
     * @lastUpdated 2026-03-20
     */
    export function isBarrelExport(node: DependencyNode): boolean {
      Iif (isBoilerplateBarrel(node)) return false; // Already handled by more specific check

      const { file, exports } = node;
      const fileName = file.split('/').pop()?.toLowerCase();

      const isIndexFile = fileName === 'index.ts' || fileName === 'index.js';
      const isSmallAndManyExports =
        node.tokenCost < BARREL_EXPORT_TOKEN_LIMIT &&
        (exports || []).length > BARREL_EXPORT_MIN_EXPORTS;

      const isReexportPattern =
        (exports || []).length >= BARREL_EXPORT_MIN_EXPORTS &&
        (exports || []).every((exp: any) =>
          ['const', 'function', 'type', 'interface'].includes(exp.type)
        );

      return !!isIndexFile || !!isSmallAndManyExports || !!isReexportPattern;
    }

    /**
     * Detect if a file is primarily type definitions.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file contains primarily types or matches type paths.
     * @lastUpdated 2026-03-18
     */
    export function isTypeDefinition(node: DependencyNode): boolean {
      const { file } = node;
      Iif (file.endsWith('.d.ts')) return true;

      const nodeExports = node.exports || [];
      const hasExports = nodeExports.length > 0;
      const areAllTypes =
        hasExports &&
        nodeExports.every(
          (exp: any) => exp.type === 'type' || exp.type === 'interface'
        );

      const isTypePath = /\/(types|interfaces|models)\//i.test(file);
      return !!areAllTypes || (isTypePath && hasExports);
    }

    /**
     * Detect if a file is a utility module.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file path or name suggests a utility/helper role.
     * @lastUpdated 2026-03-18
     */
    export function isUtilityModule(node: DependencyNode): boolean {
      const { file } = node;
      const isUtilPath = /\/(utils|helpers|util|helper)\//i.test(file);
      const fileName = file.split('/').pop()?.toLowerCase() || '';
      const isUtilName = /(utils\.|helpers\.|util\.|helper\.)/i.test(fileName);
      return isUtilPath || isUtilName;
    }

    /**
     * Detect if a file is a Lambda/API handler.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file serves as a coordination point for requests/lambdas.
     * @lastUpdated 2026-03-18
     */
    export function isLambdaHandler(node: DependencyNode): boolean {
      const { file, exports } = node;
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isHandlerName = HANDLER_NAME_PATTERNS.some((pattern: string) =>
        fileName.includes(pattern)
      );
      const isHandlerPath = /\/(handlers|lambdas|lambda|functions)\//i.test(file);
      const hasHandlerExport = (exports || []).some(
        (exp: any) =>
          ['handler', 'main', 'lambdahandler'].includes(exp.name.toLowerCase()) ||
          exp.name.toLowerCase().endsWith('handler')
      );
      return isHandlerName || isHandlerPath || hasHandlerExport;
    }

    /**
     * Detect if a file is a service file.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file orchestrates logic or matches service patterns.
     * @lastUpdated 2026-03-18
     */
    export function isServiceFile(node: DependencyNode): boolean {
      const { file, exports } = node;
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isServiceName = SERVICE_NAME_PATTERNS.some((pattern: string) =>
        fileName.includes(pattern)
      );
      const isServicePath = file.toLowerCase().includes('/services/');
      const hasServiceNamedExport = (exports || []).some((exp: any) =>
        exp.name.toLowerCase().includes('service')
      );
      const hasClassExport = (exports || []).some(
        (exp: any) => exp.type === 'class'
      );
      return (
        isServiceName || isServicePath || (hasServiceNamedExport && hasClassExport)
      );
    }

    /**
     * Detect if a file is an email template/layout.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file is used for rendering notifications or emails.
     * @lastUpdated 2026-03-18
     */
    export function isEmailTemplate(node: DependencyNode): boolean {
      const { file, exports } = node;
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isEmailName = EMAIL_NAME_PATTERNS.some((pattern: string) =>
        fileName.includes(pattern)
      );
      const isEmailPath = /\/(emails|mail|notifications)\//i.test(file);
      const hasTemplateFunction = (exports || []).some(
        (exp: any) =>
          exp.type === 'function' &&
          (exp.name.toLowerCase().startsWith('render') ||
            exp.name.toLowerCase().startsWith('generate'))
      );
      return isEmailPath || isEmailName || hasTemplateFunction;
    }

    /**
     * Detect if a file is a parser/transformer.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file handles data conversion or serialization.
     * @lastUpdated 2026-03-18
     */
    export function isParserFile(node: DependencyNode): boolean {
      const { file, exports } = node;
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isParserName = PARSER_NAME_PATTERNS.some((pattern: string) =>
        fileName.includes(pattern)
      );
      const isParserPath = /\/(parsers|transformers)\//i.test(file);
      const hasParseFunction = (exports || []).some(
        (exp: any) =>
          exp.type === 'function' &&
          (exp.name.toLowerCase().startsWith('parse') ||
            exp.name.toLowerCase().startsWith('transform'))
      );
      return isParserName || isParserPath || hasParseFunction;
    }

    /**
     * Detect if a file is a session/state management file.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file manages application state or sessions.
     * @lastUpdated 2026-03-18
     */
    export function isSessionFile(node: DependencyNode): boolean {
      const { file, exports } = node;
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isSessionName = SESSION_NAME_PATTERNS.some((pattern: string) =>
        fileName.includes(pattern)
      );
      const isSessionPath = /\/(sessions|state)\//i.test(file);
      const hasSessionExport = (exports || []).some((exp: any) =>
        ['session', 'state', 'store'].some((pattern: string) =>
          exp.name.toLowerCase().includes(pattern)
        )
      );
      return isSessionName || isSessionPath || hasSessionExport;
    }

    /**
     * Detect if a file is a Next.js App Router page.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file is a Next.js page or metadata entry.
     * @lastUpdated 2026-03-18
     */
    export function isNextJsPage(node: DependencyNode): boolean {
      const { file, exports } = node;
      const lowerPath = file.toLowerCase();
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isInAppDir =
        lowerPath.includes('/app/') || lowerPath.startsWith('app/');
      if (!isInAppDir || (fileName !== 'page.tsx' && fileName !== 'page.ts'))
        return false;

      const hasDefaultExport = (exports || []).some(
        (exp: any) => exp.type === 'default'
      );

      const hasNextJsExport = (exports || []).some((exp: any) =>
        NEXTJS_METADATA_EXPORTS.includes(exp.name.toLowerCase())
      );

      return hasDefaultExport || hasNextJsExport;
    }

    /**
     * Detect if a file is a configuration or schema file.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file matches configuration, setting, or schema patterns.
     * @lastUpdated 2026-03-18
     */
    export function isConfigFile(node: DependencyNode): boolean {
      const { file, exports } = node;
      const lowerPath = file.toLowerCase();
      const fileName = file.split('/').pop()?.toLowerCase() || '';

      const isConfigName = CONFIG_NAME_PATTERNS.some((pattern: string) =>
        fileName.includes(pattern)
      );
      const isConfigPath = /\/(config|settings|schemas)\//i.test(lowerPath);
      const hasSchemaExport = (exports || []).some((exp: any) =>
        ['schema', 'config', 'setting'].some((pattern: string) =>
          exp.name.toLowerCase().includes(pattern)
        )
      );

      return isConfigName || isConfigPath || hasSchemaExport;
    }

    /**
     * Detect if a file is part of a hub-and-spoke monorepo architecture.
     *
     * Many files spread across multiple packages (spokes) is intentional in
     * AIReady and shouldn't be penalized as heavily for fragmentation.
     *
     * @param node - The dependency node to analyze.
     * @returns True if the file path suggests it belongs to a spoke package.
     */
    export function isHubAndSpokeFile(node: DependencyNode): boolean {
      const { file } = node;
      return /\/packages\/[a-zA-Z0-9-]+\/src\//.test(file);
    }