ui: Add HEIC/HEIF image support (#24137)

* Add boilerplate for file types

* Add heic-to and implement conversion

* Load heic library from CDN

* Use jpg instead of png for conversion

* Move const to constants file

tools/ui/src/lib/utils/file-type.ts

@@ -30,6 +30,8 @@ export function getFileTypeCategory(mimeType: string): FileTypeCategory | null {
 		case MimeTypeImage.GIF:
 		case MimeTypeImage.WEBP:
 		case MimeTypeImage.SVG:
+		case MimeTypeImage.HEIC:
+		case MimeTypeImage.HEIF:
 			return FileTypeCategory.IMAGE;
 
 		// Audio
@@ -118,6 +120,8 @@ export function getFileTypeCategoryByExtension(filename: string): FileTypeCatego
 		case FileExtensionImage.GIF:
 		case FileExtensionImage.WEBP:
 		case FileExtensionImage.SVG:
+		case FileExtensionImage.HEIC:
+		case FileExtensionImage.HEIF:
 			return FileTypeCategory.IMAGE;
 
 		// Audio

tools/ui/src/lib/utils/heic-to-jpeg.ts

@@ -0,0 +1,56 @@
+import { MimeTypeImage } from '$lib/enums';
+import { HEIC_JPEG_QUALITY } from '$lib/constants/image-size';
+
+// heic requires a relatively large decoder, in order to reduce primary bundle size
+// we lazily load this decoder from a CDN when needed, and cache it for future conversions
+const HEIC_TO_CDN_URL = 'https://cdn.jsdelivr.net/npm/heic-to@1.5.2/dist/heic-to.js';
+
+interface HeicToModule {
+	heicTo(args: { blob: Blob; type: string; quality?: number }): Promise<Blob>;
+}
+
+let modulePromise: Promise<HeicToModule> | null = null;
+
+/**
+ * Lazily load the heic-to decoder from the CDN and cache it
+ * @returns Promise resolving to the heic-to module
+ */
+function getHeicTo(): Promise<HeicToModule> {
+	if (!modulePromise) {
+		modulePromise = import(/* @vite-ignore */ HEIC_TO_CDN_URL) as Promise<HeicToModule>;
+	}
+
+	return modulePromise;
+}
+
+/**
+ * Convert a HEIC/HEIF file to a compressed JPEG data URL
+ * @param file - The HEIC/HEIF file to convert
+ * @returns Promise resolving to JPEG data URL
+ */
+export async function heicFileToJpegDataURL(file: File | Blob): Promise<string> {
+	const { heicTo } = await getHeicTo();
+	const jpegBlob = await heicTo({
+		blob: file,
+		type: MimeTypeImage.JPEG,
+		quality: HEIC_JPEG_QUALITY
+	});
+
+	return new Promise((resolve, reject) => {
+		const reader = new FileReader();
+		reader.onload = () => resolve(reader.result as string);
+		reader.onerror = () => reject(reader.error);
+		reader.readAsDataURL(jpegBlob);
+	});
+}
+
+/**
+ * Check if a MIME type represents a HEIC/HEIF image
+ * @param mimeType - The MIME type to check
+ * @returns True if the MIME type is image/heic or image/heif
+ */
+export function isHeicMimeType(mimeType: string): boolean {
+	const normalized = mimeType.trim().toLowerCase();
+
+	return normalized === MimeTypeImage.HEIC || normalized === MimeTypeImage.HEIF;
+}

tools/ui/src/lib/utils/process-uploaded-files.ts

@@ -1,5 +1,6 @@
 import { isSvgMimeType, svgBase64UrlToPngDataURL } from './svg-to-png';
 import { isWebpMimeType, webpBase64UrlToPngDataURL } from './webp-to-png';
+import { heicFileToJpegDataURL, isHeicMimeType } from './heic-to-jpeg';
 import { FileTypeCategory } from '$lib/enums';
 import { SETTINGS_KEYS } from '$lib/constants';
 import { modelsStore } from '$lib/stores/models.svelte';
@@ -68,7 +69,7 @@ export async function processFilesToChatUploaded(
 			if (getFileTypeCategory(file.type) === FileTypeCategory.IMAGE) {
 				let preview = await readFileAsDataURL(file);
 
-				// Normalize SVG and WebP to PNG in previews
+				// Normalize SVG and WebP to PNG, and HEIC to compressed JPEG, in previews
 				if (isSvgMimeType(file.type)) {
 					try {
 						preview = await svgBase64UrlToPngDataURL(preview);
@@ -81,6 +82,13 @@ export async function processFilesToChatUploaded(
 					} catch (err) {
 						console.error('Failed to convert WebP to PNG:', err);
 					}
+				} else if (isHeicMimeType(file.type)) {
+					try {
+						preview = await heicFileToJpegDataURL(file);
+					} catch (err) {
+						console.error('Failed to convert HEIC to PNG:', err);
+						continue;
+					}
 				}
 
 				results.push({ ...base, preview });