Add batch image jobs runtime

src/image.ts

@@ -1,7 +1,16 @@
 import { mkdir, writeFile } from "node:fs/promises";
 import { join } from "node:path";
 
-const IMAGES_DIR = "images";
+const OUTPUT_DIR = "output";
+
+function sanitizeFileNamePart(value: string): string {
+	return value
+		.trim()
+		.toLowerCase()
+		.replace(/[^a-z0-9]+/g, "-")
+		.replace(/^-+|-+$/g, "")
+		.slice(0, 60);
+}
 
 function mediaTypeToExtension(mediaType: string): string {
 	switch (mediaType) {
@@ -18,19 +27,21 @@ function mediaTypeToExtension(mediaType: string): string {
 	}
 }
 
-function createTimestampFileName(mediaType: string): string {
+function createTimestampFileName(mediaType: string, name?: string): string {
 	const extension = mediaTypeToExtension(mediaType);
 	const timestamp = new Date().toISOString().replace(/[.:]/g, "-");
-	return `${timestamp}.${extension}`;
+	const prefix = name ? `${sanitizeFileNamePart(name)}-` : "";
+	return `${prefix}${timestamp}.${extension}`;
 }
 
 export async function saveImage(
 	bytes: Uint8Array,
 	mediaType: string,
+	name?: string,
 ): Promise<string> {
-	await mkdir(IMAGES_DIR, { recursive: true });
+	await mkdir(OUTPUT_DIR, { recursive: true });
 
-	const filePath = join(IMAGES_DIR, createTimestampFileName(mediaType));
+	const filePath = join(OUTPUT_DIR, createTimestampFileName(mediaType, name));
 	await writeFile(filePath, bytes);
 
 	return filePath;