chore: moved sentinel errors into appropriate file

Signed-off-by: Bernd Warmuth <[email protected]>

openfeature/error.go

@@ -1,23 +1 @@
 package openfeature
-
-import (
-	"errors"
-	"fmt"
-)
-
-// ProviderInitError represents an error that occurs during provider initialization.
-type ProviderInitError struct {
-	ErrorCode ErrorCode // Field to store the specific error code
-	Message   string    // Custom error message
-}
-
-// Error implements the error interface for ProviderInitError.
-func (e *ProviderInitError) Error() string {
-	return fmt.Sprintf("ProviderInitError: %s (code: %s)", e.Message, e.ErrorCode)
-}
-
-// ProviderNotReadyError signifies that an operation failed because the provider is in a NOT_READY state.
-var ProviderNotReadyError = errors.New("provider not yet initialized")
-
-// ProviderFatalError signifies that an operation failed because the provider is in a FATAL state.
-var ProviderFatalError = errors.New("provider is in an irrecoverable error state")

openfeature/resolution_error.go

@@ -1,6 +1,9 @@
 package openfeature
 
-import "fmt"
+import (
+	"errors"
+	"fmt"
+)
 
 type ErrorCode string
 
@@ -104,3 +107,21 @@ func NewGeneralResolutionError(msg string) ResolutionError {
 		message: msg,
 	}
 }
+
+// ProviderInitError represents an error that occurs during provider initialization.
+type ProviderInitError struct {
+	ErrorCode ErrorCode // Field to store the specific error code
+	Message   string    // Custom error message
+}
+
+// Error implements the error interface for ProviderInitError.
+func (e *ProviderInitError) Error() string {
+	return fmt.Sprintf("ProviderInitError: %s (code: %s)", e.Message, e.ErrorCode)
+}
+
+var (
+	// ProviderNotReadyError signifies that an operation failed because the provider is in a NOT_READY state.
+	ProviderNotReadyError = errors.New("provider not yet initialized")
+	// ProviderFatalError signifies that an operation failed because the provider is in a FATAL state.
+	ProviderFatalError = errors.New("provider is in an irrecoverable error state")
+)