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node_modules/opener/lib/opener.js

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+"use strict";
+var childProcess = require("child_process");
+var os = require("os");
+
+module.exports = function opener(args, options, callback) {
+    var platform = process.platform;
+
+    // Attempt to detect Windows Subystem for Linux (WSL). WSL  itself as Linux (which works in most cases), but in
+    // this specific case we need to treat it as actually being Windows. The "Windows-way" of opening things through
+    // cmd.exe works just fine here, whereas using xdg-open does not, since there is no X Windows in WSL.
+    if (platform === "linux" && os.release().indexOf("Microsoft") !== -1) {
+        platform = "win32";
+    }
+
+    // http://stackoverflow.com/q/1480971/3191, but see below for Windows.
+    var command;
+    switch (platform) {
+        case "win32": {
+            command = "cmd.exe";
+            break;
+        }
+        case "darwin": {
+            command = "open";
+            break;
+        }
+        default: {
+            command = "xdg-open";
+            break;
+        }
+    }
+
+    if (typeof args === "string") {
+        args = [args];
+    }
+
+    if (typeof options === "function") {
+        callback = options;
+        options = {};
+    }
+
+    if (options && typeof options === "object" && options.command) {
+        if (platform === "win32") {
+            // *always* use cmd on windows
+            args = [options.command].concat(args);
+        } else {
+            command = options.command;
+        }
+    }
+
+    if (platform === "win32") {
+        // On Windows, we really want to use the "start" command. But, the rules regarding arguments with spaces, and
+        // escaping them with quotes, can get really arcane. So the easiest way to deal with this is to pass off the
+        // responsibility to "cmd /c", which has that logic built in.
+        //
+        // Furthermore, if "cmd /c" double-quoted the first parameter, then "start" will interpret it as a window title,
+        // so we need to add a dummy empty-string window title: http://stackoverflow.com/a/154090/3191
+        //
+        // Additionally, on Windows ampersand and caret need to be escaped when passed to "start"
+        args = args.map(function (value) {
+            return value.replace(/[&^]/g, "^$&");
+        });
+        args = ["/c", "start", "\"\""].concat(args);
+    }
+
+    return childProcess.execFile(command, args, options, callback);
+};