perf(core): Remove Zod from startup path and optimize output generation

src/core/output/outputGenerate.ts

@@ -4,7 +4,7 @@ import XMLBuilder from 'fast-xml-builder';
 import Handlebars from 'handlebars';
 import type { RepomixConfigMerged } from '../../config/configSchema.js';
 import { RepomixError } from '../../shared/errorHandle.js';
-import { type FileSearchResult, listDirectories, listFiles, searchFiles } from '../file/fileSearch.js';
+import { listDirectories, listFiles, searchFiles } from '../file/fileSearch.js';
 import { type FilesByRoot, generateTreeString, generateTreeStringWithRoots } from '../file/fileTreeGenerate.js';
 import type { ProcessedFile } from '../file/fileTypes.js';
 import type { GitDiffResult } from '../git/gitDiffHandle.js';
@@ -347,7 +347,8 @@ export const buildOutputGeneratorContext = async (
       const additionalFiles = allRepoFiles.filter((p) => !includedSet.has(p));
 
       directoryPathsForTree = allDirectories;
-      filePathsForTree = Array.from(new Set([...allFilePaths, ...additionalFiles]));
+      // additionalFiles is already disjoint from allFilePaths (filtered above), so no dedup needed
+      filePathsForTree = allFilePaths.concat(additionalFiles);
     } catch (error) {
       throw new RepomixError(
         `Failed to build full directory structure: ${error instanceof Error ? error.message : String(error)}`,
@@ -357,14 +358,8 @@ export const buildOutputGeneratorContext = async (
   } else if (config.output.directoryStructure && config.output.includeEmptyDirectories) {
     // Default behavior: include empty directories only
     try {
-      const merged = (await Promise.all(rootDirs.map((rootDir) => deps.searchFiles(rootDir, config)))).reduce(
-        (acc: FileSearchResult, curr: FileSearchResult) =>
-          ({
-            filePaths: [...acc.filePaths, ...curr.filePaths],
-            emptyDirPaths: [...acc.emptyDirPaths, ...curr.emptyDirPaths],
-          }) as FileSearchResult,
-        { filePaths: [], emptyDirPaths: [] },
-      ).emptyDirPaths;
+      const results = await Promise.all(rootDirs.map((rootDir) => deps.searchFiles(rootDir, config)));
+      const merged = results.flatMap((r) => r.emptyDirPaths);
       directoryPathsForTree = [...new Set(merged)].sort();
     } catch (error) {
       throw new RepomixError(

src/core/output/outputSort.ts

@@ -50,9 +50,8 @@ const getFileChangeCounts = async (
     const fileChangeCounts = await deps.getFileChangeCount(cwd, maxCommits);
     fileChangeCountsCache.set(cacheKey, fileChangeCounts);
 
-    const sortedFileChangeCounts = Object.entries(fileChangeCounts).sort((a, b) => b[1] - a[1]);
     logger.trace('Git File change counts max commits:', maxCommits);
-    logger.trace('Git File change counts:', sortedFileChangeCounts);
+    logger.trace('Git File change counts:', fileChangeCounts);
 
     return fileChangeCounts;
   } catch {

src/shared/errorHandle.ts

@@ -1,5 +1,4 @@
 import { inspect } from 'node:util';
-import { z } from 'zod';
 import { REPOMIX_DISCORD_URL, REPOMIX_ISSUES_URL } from './constants.js';
 import { logger, repomixLogLevels } from './logger.js';
 
@@ -115,9 +114,19 @@ const isRepomixError = (error: unknown): error is RepomixError => {
   );
 };
 
+/**
+ * Checks if an error is a ZodError using duck typing to avoid eagerly importing Zod.
+ * ZodErrors have a `name` of 'ZodError' and an `issues` array.
+ */
 export const rethrowValidationErrorIfZodError = (error: unknown, message: string): void => {
-  if (error instanceof z.ZodError) {
-    const zodErrorText = error.issues.map((err) => `[${err.path.join('.')}] ${err.message}`).join('\n  ');
+  if (
+    error instanceof Error &&
+    error.name === 'ZodError' &&
+    'issues' in error &&
+    Array.isArray((error as { issues: unknown[] }).issues)
+  ) {
+    const issues = (error as { issues: Array<{ path: string[]; message: string }> }).issues;
+    const zodErrorText = issues.map((err) => `[${err.path.join('.')}] ${err.message}`).join('\n  ');
     throw new RepomixConfigValidationError(
       `${message}\n\n  ${zodErrorText}\n\n  Please check the config file and try again.`,
     );