Ignore generic metadata files in counts

README.md

@@ -8,6 +8,7 @@ Tiny API that clones a Git repo and counts its non-empty lines of code.
 - Optional API key enforcement
 - Per-repo in-memory caching
 - Extension-based language breakdown
+- Generic project metadata files are ignored during counting
 - Basic rate limiting
 - Bounded concurrent scans so the host does not get hammered
 - SSH key file support for private repos
@@ -66,6 +67,12 @@ curl "http://localhost:3000/ssh/public-key?ssh_key=loc_via_git_ed25519"
 - The service also sweeps stale temp directories in case a process dies mid-scan.
 - Cache entries live in memory only and expire after `CACHE_TTL_MINUTES`.
 
+## Counting rules
+
+- Only text files are counted.
+- Empty lines are ignored.
+- Generic project metadata files are skipped with a filename blacklist, for example `package.json`, lockfiles, `tsconfig.json`, and similar config/build files.
+
 ## Configuration
 
 Copy `.env.example` to `.env` and adjust:

src/file-filter.ts

@@ -0,0 +1,57 @@
+import path from "node:path";
+
+const ignoredFileNames = new Set([
+  ".editorconfig",
+  ".gitattributes",
+  ".gitignore",
+  ".gitmodules",
+  ".npmrc",
+  ".nvmrc",
+  ".prettierignore",
+  ".prettierrc",
+  ".prettierrc.json",
+  ".yarnrc",
+  ".yarnrc.yml",
+  "bun.lock",
+  "bun.lockb",
+  "cargo.lock",
+  "composer.json",
+  "composer.lock",
+  "deno.json",
+  "deno.lock",
+  "docker-compose.yaml",
+  "docker-compose.yml",
+  "eslint.config.js",
+  "eslint.config.mjs",
+  "global.json",
+  "go.mod",
+  "go.sum",
+  "gradle.properties",
+  "makefile",
+  "package-lock.json",
+  "package.json",
+  "pnpm-lock.yaml",
+  "poetry.lock",
+  "pom.xml",
+  "requirements.txt",
+  "rollup.config.js",
+  "rollup.config.mjs",
+  "settings.gradle",
+  "settings.gradle.kts",
+  "tsconfig.base.json",
+  "tsconfig.build.json",
+  "tsconfig.json",
+  "tsconfig.node.json",
+  "turbo.json",
+  "vite.config.js",
+  "vite.config.mjs",
+  "vite.config.ts",
+  "webpack.config.js",
+  "webpack.config.ts",
+  "yarn.lock"
+]);
+
+export function shouldIgnoreCountFile(filePath: string): boolean {
+  const fileName = path.basename(filePath).toLowerCase();
+  return ignoredFileNames.has(fileName);
+}

src/services/repo-counter.ts

@@ -5,6 +5,7 @@ import path from "node:path";
 
 import type { RuntimeConfig } from "../config.js";
 import { HttpError } from "../errors.js";
+import { shouldIgnoreCountFile } from "../file-filter.js";
 import { detectLanguage } from "../language.js";
 import { Semaphore } from "../lib/semaphore.js";
 import type { CountRequest, CountResult, LanguageStat } from "../types.js";
@@ -183,6 +184,10 @@ async function countDirectory(rootDir: string): Promise<{
         continue;
       }
 
+      if (shouldIgnoreCountFile(fullPath)) {
+        continue;
+      }
+
       const lines = await countFileLines(fullPath);
       const language = detectLanguage(fullPath);
       const current = languages.get(language) ?? { language, files: 0, lines: 0 };

tests/file-filter.test.js

@@ -0,0 +1,12 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { shouldIgnoreCountFile } from "../dist/file-filter.js";
+
+test("shouldIgnoreCountFile skips generic project metadata files", () => {
+  assert.equal(shouldIgnoreCountFile("/tmp/package.json"), true);
+  assert.equal(shouldIgnoreCountFile("/tmp/tsconfig.json"), true);
+  assert.equal(shouldIgnoreCountFile("/tmp/docker-compose.yml"), true);
+  assert.equal(shouldIgnoreCountFile("/tmp/src/index.ts"), false);
+  assert.equal(shouldIgnoreCountFile("/tmp/README.md"), false);
+});