refactor(frontend): scripts -> utility

packages/frontend/src/utility/upload/compress-config.ts

@@ -0,0 +1,36 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import isAnimated from 'is-file-animated';
+import { isWebpSupported } from './isWebpSupported.js';
+import type { BrowserImageResizerConfigWithConvertedOutput } from '@misskey-dev/browser-image-resizer';
+
+const compressTypeMap = {
+	'image/jpeg': { quality: 0.90, mimeType: 'image/webp' },
+	'image/png': { quality: 1, mimeType: 'image/webp' },
+	'image/webp': { quality: 0.90, mimeType: 'image/webp' },
+	'image/svg+xml': { quality: 1, mimeType: 'image/webp' },
+} as const;
+
+const compressTypeMapFallback = {
+	'image/jpeg': { quality: 0.85, mimeType: 'image/jpeg' },
+	'image/png': { quality: 1, mimeType: 'image/png' },
+	'image/webp': { quality: 0.85, mimeType: 'image/jpeg' },
+	'image/svg+xml': { quality: 1, mimeType: 'image/png' },
+} as const;
+
+export async function getCompressionConfig(file: File): Promise<BrowserImageResizerConfigWithConvertedOutput | undefined> {
+	const imgConfig = (isWebpSupported() ? compressTypeMap : compressTypeMapFallback)[file.type];
+	if (!imgConfig || await isAnimated(file)) {
+		return;
+	}
+
+	return {
+		maxWidth: 2048,
+		maxHeight: 2048,
+		debug: true,
+		...imgConfig,
+	};
+}