Make manifest generation accept configurable paths

Update generateManifest.ts to accept source and dist directories as
command-line arguments instead of using hard-coded relative paths,
improving flexibility and testability.

Author: mkobayashime

Makefile

@@ -36,7 +36,7 @@ build: node_modules clear PHONY
 	@make docgen
 
 build.manifest: node_modules PHONY
-	bun run ./bin/generateManifest.ts
+	bun run ./bin/generateManifest.ts ./src ./dist
 
 docgen: node_modules PHONY
 	bun run bin/docgen/index.ts

bin/generateManifest.ts

@@ -10,8 +10,10 @@ type ManifestJson = Array<{
 }>;
 
 const generateManifest = async (): Promise<void> => {
-	const srcDir = path.resolve(import.meta.dirname, "../src");
-	const distDir = path.resolve(import.meta.dirname, "../dist");
+	const [relativeSrcDir, relativeDistDir] = process.argv.slice(2);
+
+	const srcDir = path.resolve(process.cwd(), relativeSrcDir);
+	const distDir = path.resolve(process.cwd(), relativeDistDir);
 	const outputPath = path.join(distDir, "manifest.json");
 
 	const files = await readdir(srcDir);