fix: arm64 detection

browser.js

@@ -20,15 +20,45 @@ module.exports = function arch () {
     return 'x64'
   }
 
+  if ([
+    'ARM64',
+    'AArch64'
+  ].some(function (str) {
+    return userAgent.indexOf(str) > -1
+  })) {
+    return 'arm64'
+  }
+
   /**
    * Platform strings that indicate a 64-bit OS.
    * See: http://stackoverflow.com/a/19883965/292185
    */
   var platform = navigator.platform
-  if (platform === 'MacIntel' || platform === 'Linux x86_64') {
+  if (platform === 'Linux x86_64' || platform === 'Linux x86_64 X11') {
     return 'x64'
   }
 
+  if (platform === 'Linux aarch64' || platform === 'Linux armv8l') {
+    return 'arm64'
+  }
+
+  /**
+   * 
+   * Detect if the browser is running on an Mac ARM64 architecture.
+   * See: https://stackoverflow.com/a/65412357
+   */
+  if (platform === 'MacIntel') {
+    var canvas = OffscreenCanvas(1, 1);
+    var w = canvas.getContext("webgl");
+    var d = w.getExtension('WEBGL_debug_renderer_info');
+    var g = d && w.getParameter(d.UNMASKED_RENDERER_WEBGL) || "";
+    if (g.match(/Apple/) && !g.match(/Apple GPU/)) {
+      return 'arm64'
+    } else {
+      return 'x64'
+    }
+  }
+
   /**
    * CPU class strings that indicate a 64-bit OS.
    * See: http://stackoverflow.com/a/6267019/292185

index.js

@@ -34,6 +34,10 @@ module.exports = function arch () {
    * See: https://twitter.com/feross/status/776949077208510464
    */
   if (process.platform === 'win32') {
+    if (process.arch === 'arm64') {
+      return 'arm64'
+    }
+
     var useEnv = false
     try {
       useEnv = !!(process.env.SYSTEMROOT && fs.statSync(process.env.SYSTEMROOT))
@@ -54,6 +58,10 @@ module.exports = function arch () {
    * On Linux, use the `getconf` command to get the architecture.
    */
   if (process.platform === 'linux') {
+    if (process.arch === 'arm64') {
+      return 'arm64'
+    }
+
     var output = cp.execSync('getconf LONG_BIT', { encoding: 'utf8' })
     return output === '64\n' ? 'x64' : 'x86'
   }