Refactor implementation to replace Express with native Deno HTTP server and add cross-platform URL opening functionality. Update implementation plan to reflect completed tasks for dependency management.

src/lib/deno-open.ts

@@ -0,0 +1,70 @@
+/**
+ * Opens a URL in the default browser.
+ * This is a cross-platform implementation using Deno subprocess API
+ * @param url The URL to open
+ * @returns A promise that resolves when the command has been executed
+ */
+export default async function open(url: string): Promise<void> {
+  let command: string[];
+  const isWindows = Deno.build.os === "windows";
+  const isMac = Deno.build.os === "darwin";
+  const isLinux = Deno.build.os === "linux";
+
+  if (isWindows) {
+    command = ["cmd", "/c", "start", "", url];
+  } else if (isMac) {
+    command = ["open", url];
+  } else if (isLinux) {
+    // On Linux, try several common browser-opener commands
+    const linuxCommands = [
+      ["xdg-open", url],
+      ["gnome-open", url],
+      ["kde-open", url],
+      ["wslview", url] // For Windows Subsystem for Linux
+    ];
+
+    // Try each command in order until one succeeds
+    for (const cmd of linuxCommands) {
+      try {
+        const process = new Deno.Command(cmd[0], {
+          args: cmd.slice(1),
+          stdout: "null",
+          stderr: "null"
+        }).spawn();
+
+        const status = await process.status;
+
+        if (status.success) {
+          return; // Command succeeded, so exit the function
+        }
+      } catch {
+        // If this command fails, try the next one
+      }
+    }
+
+    // If we get here, none of the commands worked
+    throw new Error("Could not open browser on Linux. Please open URL manually.");
+  } else {
+    throw new Error(`Unsupported platform: ${Deno.build.os}`);
+  }
+
+  // For Windows and Mac, execute the chosen command
+  if (isWindows || isMac) {
+    try {
+      const process = new Deno.Command(command[0], {
+        args: command.slice(1),
+        stdout: "null",
+        stderr: "null"
+      }).spawn();
+
+      const status = await process.status;
+
+      if (!status.success) {
+        throw new Error(`Failed to open ${url} in browser`);
+      }
+    } catch (error: unknown) {
+      const errorMessage = error instanceof Error ? error.message : String(error);
+      throw new Error(`Failed to open ${url} in browser: ${errorMessage}`);
+    }
+  }
+}