Don't send argv with spawn if set to undefined

This is important as argv is not supported when spawning Android apps,
and so this must be set to false.

README.md

@@ -145,10 +145,12 @@ Injects a given Frida script into a target process, specified by PID. Returns a
 
 Injects real JavaScript into Node.JS processes specifically. Rather than requiring a full Frida script, this takes any normal JS script, and conveniently wraps it with a script to inject it into the V8 event loop for you, so you can just write JS and run it in a target directly.
 
-### `fridaClient.spawnWithScript(command: string, args: string[], script: string)`
+### `fridaClient.spawnWithScript(command: string, args: string[] | undefined, script: string)`
 
 Takes a command to run and arguments, launches the process via Frida, injects the given Frida script before it starts, and then resumes the process.
 
+Note that to launch apps on Android, `command` should be a package name like `com.android.dialer` and `args` must be undefined.
+
 ### `fridaClient.disconnect()`
 
 When you're done, it's polite to disconnect from Frida. This returns a promise which resolves once the WebSocket connection has been closed.

src/index.ts

@@ -129,11 +129,13 @@ export class FridaSession {
         return this.injectIntoProcess(pid, fridaScript);
     }
 
-    async spawnWithScript(command: string, args: string[], fridaScript: string) {
+    async spawnWithScript(command: string, args: string[] | undefined, fridaScript: string) {
         const hostSession: any = await this.getHostSession();
 
         const pid = await hostSession.Spawn(command, [
-            true, [command, ...args],
+            ...(args
+                ? [true, [command, ...args]]
+                : [false, []]),
             false, [],
             false, [],
             "",