guard against using reserved words for function names

internal/commands/deploy/deploy.go

@@ -80,6 +80,9 @@ func (d *DeployCmd) deploySync() error {
 	}
 	updates = append(updates, su...)
 	d.updates = updates
+	if err := d.validateUpdates(); err != nil {
+		return fmt.Errorf("deployment failed - %v", err)
+	}
 	return nil
 }
 
@@ -426,3 +429,12 @@ func (d *DeployCmd) refreshCredentials() error {
 	d.aws = awsClient
 	return nil
 }
+
+func (d *DeployCmd) validateUpdates() error {
+	for _, u := range d.updates {
+		if u.Function != nil && u.Action == mantil.Add && !mantil.FunctionNameAvailable(u.Function.Name) {
+			return fmt.Errorf("api name \"%s\" is reserved", u.Function.Name)
+		}
+	}
+	return nil
+}

internal/commands/generate/generate.go

@@ -15,6 +15,9 @@ import (
 )
 
 func Api(name string, methods []string) error {
+	if !mantil.FunctionNameAvailable(name) {
+		return fmt.Errorf("could not generate api - name \"%s\" is reserved", name)
+	}
 	projectPath, err := mantil.FindProjectRoot(".")
 	if err != nil {
 		return err

internal/mantil/validate.go

@@ -0,0 +1,14 @@
+package mantil
+
+var reservedFunctionNames = []string{
+	"public",
+}
+
+func FunctionNameAvailable(name string) bool {
+	for _, rn := range reservedFunctionNames {
+		if name == rn {
+			return false
+		}
+	}
+	return true
+}