Improve app build time: parallel builds and task deduplication

CHANGELOG.md

@@ -1,4 +1,7 @@
-## [55.2.2]
+## [55.2.3]
+- [Build] Improved app build time by running Android, iOS and Library builds in parallel, and ensuring `init` (dotnet restore) runs only once across dependent tasks.
+
+
 - [iOS26][Tip] Added more padding.
 
 ## [55.2.1]

build/AwesomeBuildsystem/Core/TaskRunner.csx

@@ -58,6 +58,7 @@ public class TaskDefinition
 public static class TaskRunner 
 {
     private static Dictionary<string, TaskDefinition> tasks = new Dictionary<string, TaskDefinition>();
+    private static System.Collections.Concurrent.ConcurrentDictionary<string, Task> _executedTasks = new System.Collections.Concurrent.ConcurrentDictionary<string, Task>();
 
     /// <summary>
     /// Creates a new async task definition
@@ -90,27 +91,44 @@ public static class TaskRunner
     }
 
     /// <summary>
-    /// Runs a single task by name or alias
+    /// Runs a single task by name or alias.
+    /// Dependencies declared with IsDependentOn are resolved and run first.
+    /// Each task is guaranteed to run at most once per build session.
     /// </summary>
     /// <param name="taskNameOrAlias">Name or alias of the task to run</param>
-    public static async Task RunAsync(string taskNameOrAlias)
+    public static Task RunAsync(string taskNameOrAlias)
     {
         var actualTaskName = ResolveTaskName(taskNameOrAlias);
 
-        if (actualTaskName != null && tasks.TryGetValue(actualTaskName, out var task))
+        if (actualTaskName == null || !tasks.TryGetValue(actualTaskName, out var task))
         {
-            Console.WriteLine($"Running task: {actualTaskName}" + (actualTaskName != taskNameOrAlias ? $" (alias: {taskNameOrAlias})" : ""));
-
-            if (task.BeforeAction != null) await task.BeforeAction();
-            if (task.Action != null) await task.Action();
-            if (task.AfterAction != null) await task.AfterAction();
-
-            Console.WriteLine($"Completed task: {actualTaskName}");
+            Console.WriteLine($"Task '{taskNameOrAlias}' not found");
+            return Task.CompletedTask;
         }
-        else
+
+        // GetOrAdd ensures the task body executes exactly once even when called concurrently.
+        return _executedTasks.GetOrAdd(actualTaskName, _ => ExecuteTaskAsync(task, actualTaskName, taskNameOrAlias));
+    }
+
+    private static async Task ExecuteTaskAsync(TaskDefinition task, string actualTaskName, string taskNameOrAlias)
+    {
+        // Run all dependencies first, in parallel when there are multiple.
+        if (task.Dependencies.Count == 1)
         {
-            Console.WriteLine($"Task '{taskNameOrAlias}' not found");
+            await RunAsync(task.Dependencies[0]);
         }
+        else if (task.Dependencies.Count > 1)
+        {
+            await Task.WhenAll(task.Dependencies.Select(dep => RunAsync(dep)));
+        }
+
+        Console.WriteLine($"Running task: {actualTaskName}" + (actualTaskName != taskNameOrAlias ? $" (alias: {taskNameOrAlias})" : ""));
+
+        if (task.BeforeAction != null) await task.BeforeAction();
+        if (task.Action != null) await task.Action();
+        if (task.AfterAction != null) await task.AfterAction();
+
+        Console.WriteLine($"Completed task: {actualTaskName}");
     }
 
     /// <summary>

build/build.csx

@@ -165,7 +165,7 @@ TaskRunner
     .Alias("bi")
     .IsDependentOn("init")
     .DoesBefore(() => { Console.WriteLine("##[group]buildiOS 🛠"); return Task.CompletedTask; })
-    .Does(() => iOS.Build(LibraryPath, "Debug"))
+    .Does(() => iOS.Build(ComponentsPath, "Debug"))
     .DoesAfter(() => { Console.WriteLine("##[endgroup]"); return Task.CompletedTask; });
 
 TaskRunner
@@ -332,7 +332,11 @@ TaskRunner
     .Alias("ball")
     .DoesBefore(() => { Console.WriteLine("##[group]buildAll 🛠"); return Task.CompletedTask; })
     .Does(async () => {
-        await TaskRunner.RunAsync(new[] { "buildAndroid", "buildiOS", "buildLibrary" }, false);
+        await Task.WhenAll(
+            TaskRunner.RunAsync("buildAndroid"),
+            TaskRunner.RunAsync("buildiOS"),
+            TaskRunner.RunAsync("buildLibrary")
+        );
     })
     .DoesAfter(() => { Console.WriteLine("##[endgroup]"); return Task.CompletedTask; });