Add support for 3mf (#415)

core.d.ts

@@ -136,7 +136,8 @@ declare namespace core {
 		| 'pgp'
 		| 'asar'
 		| 'stl'
-		| 'chm';
+		| 'chm'
+		| '3mf';
 
 	type MimeType =
 		| 'image/jpeg'
@@ -266,7 +267,8 @@ declare namespace core {
 		| 'application/pgp-encrypted'
 		| 'application/x-asar'
 		| 'model/stl'
-		| 'application/vnd.ms-htmlhelp';
+		| 'application/vnd.ms-htmlhelp'
+		| 'model/3mf';
 
 	interface FileTypeResult {
 		/**

core.js

@@ -318,6 +318,13 @@ async function _fromTokenizer(tokenizer) {
 					};
 				}
 
+				if (zipHeader.filename.startsWith('3D/') && zipHeader.filename.endsWith('.model')) {
+					return {
+						ext: '3mf',
+						mime: 'model/3mf'
+					};
+				}
+
 				// The docx, xlsx and pptx file types extend the Office Open XML file format:
 				// https://en.wikipedia.org/wiki/Office_Open_XML_file_formats
 				// We look for:

package.json

@@ -180,7 +180,8 @@
 		"pgp",
 		"asar",
 		"stl",
-		"chm"
+		"chm",
+		"3mf"
 	],
 	"devDependencies": {
 		"@types/node": "^13.1.4",

readme.md

@@ -405,6 +405,7 @@ Returns a set of supported MIME types.
 - [`asar`](https://github.com/electron/asar#format) - Archive format primarily used to enclose Electron applications
 - [`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
 
 *Pull requests are welcome for additional commonly used file types.*
 

supported.js

@@ -134,7 +134,8 @@ module.exports = {
 		'pgp',
 		'asar',
 		'stl',
-		'chm'
+		'chm',
+		'3mf'
 	],
 	mimeTypes: [
 		'image/jpeg',
@@ -264,6 +265,7 @@ module.exports = {
 		'application/pgp-encrypted',
 		'application/x-asar',
 		'model/stl',
-		'application/vnd.ms-htmlhelp'
+		'application/vnd.ms-htmlhelp',
+		'model/3mf'
 	]
 };