Add support for Java class (#591)

Author: dcfreire

core.d.ts

@@ -144,7 +144,8 @@ export type FileExtension =
 	| 'jls'
 	| 'pst'
 	| 'dwg'
-	| 'parquet';
+	| 'parquet'
+	| 'class';
 
 export type MimeType =
 	| 'image/jpeg'
@@ -284,7 +285,8 @@ export type MimeType =
 	| 'image/jls'
 	| 'application/vnd.ms-outlook'
 	| 'image/vnd.dwg'
-	| 'application/x-parquet';
+	| 'application/x-parquet'
+	| 'application/java-vm';
 
 export type FileTypeResult = {
 	/**

core.js

@@ -917,6 +917,13 @@ class FileTypeParser {
 			};
 		}
 
+		if (this.check([0xCA, 0xFE, 0xBA, 0xBE])) {
+			return {
+				ext: 'class',
+				mime: 'application/java-vm',
+			};
+		}
+
 		// -- 6-byte signatures --
 
 		if (this.check([0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00])) {

fixture/fixture.class

@@ -197,7 +197,8 @@
 		"jls",
 		"pst",
 		"dwg",
-		"parquet"
+		"parquet",
+		"class"
 	],
 	"dependencies": {
 		"readable-web-to-node-stream": "^3.0.2",

package.json

@@ -364,6 +364,7 @@ Returns a `Set<string>` of supported MIME types.
 - [`cab`](https://en.wikipedia.org/wiki/Cabinet_(file_format)) - Cabinet file
 - [`cfb`](https://en.wikipedia.org/wiki/Compound_File_Binary_Format) - Compount File Binary Format
 - [`chm`](https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help) - Microsoft Compiled HTML Help
+- [`class`](https://en.wikipedia.org/wiki/Java_class_file) - Java class file
 - [`cr2`](https://fileinfo.com/extension/cr2) - Canon Raw image file (v2)
 - [`cr3`](https://fileinfo.com/extension/cr3) - Canon Raw image file (v3)
 - [`crx`](https://developer.chrome.com/extensions/crx) - Google Chrome extension

readme.md

@@ -142,6 +142,7 @@ export const extensions = [
 	'pst',
 	'dwg',
 	'parquet',
+	'class',
 ];
 
 export const mimeTypes = [
@@ -283,4 +284,5 @@ export const mimeTypes = [
 	'application/vnd.ms-outlook',
 	'image/vnd.dwg',
 	'application/x-parquet',
+	'application/java-vm',
 ];