chore: cleanup repo

.golangci.yaml

@@ -5,6 +5,10 @@ run:
   tests: false
   allow-parallel-runners: true
 linters:
+  exclusions:
+    paths:
+      - samples
+
   default: none
   enable:
     - bodyclose

README.md

@@ -86,15 +86,6 @@ func (c *Container) Resolve(target interface{}) error
 func (c *Container) MustResolve(target interface{})
 ```
 
-## ⚠️ Current Limitations
-
-- **Exact Type Matching Only** - No interface binding support
-- **Basic Named Dependencies** - No tags or name-based resolution
-- **No Lifecycle Hooks** - Basic startup/shutdown only
-- **Limited ctor return types** - Only support ctors which returns pointers
-- **Only types in ctor return** - Doesn't support interfaces as ctor return value
-- **Only one return value** - one ctor = one value
-
 ## 🛣️ Roadmap
 
 - [x] Basic dependency resolution with reflection
@@ -104,6 +95,15 @@ func (c *Container) MustResolve(target interface{})
 - [x] Error handling
 - [ ] Named dependency resolution
 - [x] Dependency graph visualization
+- [x] Error handling
+- [ ] Scope support
+- [ ] Lifecycle support
+
+## ⚠️ Current Limitations
+- **Basic Named Dependencies** - No tags or name-based resolution
+- **No Lifecycle Hooks** - Basic startup/shutdown only
+- **Limited ctor return types** - Only support ctors which returns pointers (*T) or (*T, error)
+- **Only types in ctor return** - Doesn't support interfaces as ctor return value
 
 ## 📊 Benefits
 

container.go

@@ -1,4 +1,3 @@
-// container.go
 package compoapp
 
 import (
@@ -25,6 +24,8 @@ type Container struct {
 	typesCtors map[reflect.Type]*constructorInfo
 
 	debug bool
+	// mark if container resolved
+	resolved bool
 }
 
 // Debug enables debug mode
@@ -211,6 +212,8 @@ func (c *Container) Resolve(target any) error {
 		instanceValue := reflect.ValueOf(instance)
 		if instanceValue.Type().AssignableTo(targetType) {
 			targetValue.Elem().Set(instanceValue)
+
+			c.resolved = true
 			return nil
 		}
 		return fmt.Errorf("resolved instance type %s is not assignable to target type %s",
@@ -455,6 +458,10 @@ const dotHeader string = `digraph DependencyGraph {
 func (c *Container) Visualize(filepath string) error {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
+
+	if !c.resolved {
+		return fmt.Errorf("you must call MustResolve or Resolve first")
+	}
 	//nolint:gosec
 	f, err := os.Create(filepath)
 	if err != nil {