Add support for Apple Silicon and other ARM builds (#115)

* Add arm_64 platforms

* Update lib/aliases.js

Co-authored-by: Leo Lamprecht <mindrun@icloud.com>

* Apply suggestions from code review

Co-authored-by: Leo Lamprecht <mindrun@icloud.com>

Co-authored-by: Leo Lamprecht <mindrun@icloud.com>

lib/aliases.js

@@ -7,6 +7,11 @@ const aliases = {
   dmg: ['dmg']
 }
 
+for (const existingPlatform of Object.keys(aliases)) {
+  const newPlatform = existingPlatform + '_arm64';
+  aliases[newPlatform] = aliases[existingPlatform].map(alias => `${alias}_arm64`);
+}
+
 module.exports = platform => {
   if (typeof aliases[platform] !== 'undefined') {
     return platform

lib/platform.js

@@ -3,14 +3,15 @@ const { extname } = require('path')
 
 module.exports = fileName => {
   const extension = extname(fileName).slice(1)
+  const arch = (fileName.includes('arm64') || fileName.includes('aarch64')) ? '_arm64' : ''
 
   if (
     (fileName.includes('mac') || fileName.includes('darwin')) &&
     extension === 'zip'
   ) {
-    return 'darwin'
+    return 'darwin' + arch
   }
 
   const directCache = ['exe', 'dmg', 'rpm', 'deb', 'AppImage']
-  return directCache.find(ext => ext === extension) || false
+  return directCache.includes(extension) ? (extension + arch) : false
 }

lib/routes.js

@@ -81,6 +81,10 @@ module.exports = ({ cache, config }) => {
       platform = 'dmg'
     }
 
+    if (platform === 'mac_arm64' && !isUpdate) {
+      platform = 'dmg_arm64'
+    }
+
     // Get the latest version from the cache
     const latest = await loadCache()