Add support for JPEG XL image format (#455)

Author: TheDecryptor

core.d.ts

@@ -140,6 +140,7 @@ declare namespace core {
 		| 'chm'
 		| '3mf'
 		| 'zst'
+		| 'jxl'
 		| 'vcf';
 
 	type MimeType =
@@ -274,6 +275,7 @@ declare namespace core {
 		| 'model/stl'
 		| 'application/vnd.ms-htmlhelp'
 		| 'model/3mf'
+		| 'image/jxl'
 		| 'application/zstd';
 
 	interface FileTypeResult {

core.js

@@ -1162,6 +1162,16 @@ async function _fromTokenizer(tokenizer) {
 		}
 	}
 
+	if (
+		check([0xFF, 0x0A]) ||
+		check([0x00, 0x00, 0x00, 0x0C, 0x4A, 0x58, 0x4C, 0x20, 0x0D, 0x0A, 0x87, 0x0A])
+	) {
+		return {
+			ext: 'jxl',
+			mime: 'image/jxl'
+		};
+	}
+
 	// -- Unsafe signatures --
 
 	if (

fixture/fixture.jxl

@@ -184,6 +184,7 @@
 		"chm",
 		"3mf",
 		"zst",
+		"jxl",
 		"vcf"
 	],
 	"devDependencies": {

fixture/fixture2.jxl

@@ -409,6 +409,7 @@ Returns a set of supported MIME types.
 - [`stl`](https://en.wikipedia.org/wiki/STL_(file_format)) - Standard Tesselated Geometry File Format (ASCII only)
 - [`chm`](https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help) - Microsoft Compiled HTML Help
 - [`3mf`](https://en.wikipedia.org/wiki/3D_Manufacturing_Format) - 3D Manufacturing Format
+- [`jxl`](https://en.wikipedia.org/wiki/JPEG_XL) - JPEG XL image format
 
 *Pull requests are welcome for additional commonly used file types.*
 

package.json

@@ -138,6 +138,7 @@ module.exports = {
 		'chm',
 		'3mf',
 		'zst',
+		'jxl',
 		'vcf'
 	],
 	mimeTypes: [
@@ -272,6 +273,7 @@ module.exports = {
 		'model/stl',
 		'application/vnd.ms-htmlhelp',
 		'model/3mf',
+		'image/jxl',
 		'application/zstd'
 	]
 };

readme.md

@@ -189,6 +189,10 @@ const names = {
 		'fixture-normal', // Normal AI
 		'fixture-without-pdf-compatibility' // AI without the PDF compatibility (cannot be opened by PDF viewers I guess)
 	],
+	jxl: [
+		'fixture', // Image data stored within JXL container
+		'fixture2' // Bare image data with no container
+	],
 	pdf: [
 		'fixture',
 		'fixture-adobe-illustrator', // PDF saved from Adobe Illustrator, using the default "[Illustrator Default]" preset