From 102e89c56bb7db90d537328ade82d58c198a4891 Mon Sep 17 00:00:00 2001
From: LandonTClipp <11232769+LandonTClipp@users.noreply.github.com>
Date: Fri, 15 Nov 2024 19:04:25 -0600
Subject: [PATCH] Add `resolve-type-alias` parameter

---
 pkg/config/config.go | 28 +++++++++++++++-------------
 pkg/generator.go     |  4 ++++
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/pkg/config/config.go b/pkg/config/config.go
index d3928e6ab..97b6a7e90 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -33,7 +33,7 @@ type Interface struct {
 
 type Config struct {
 	All                  bool                   `mapstructure:"all"`
-	MockBuildTags        string                 `mapstructure:"mock-build-tags"`
+	BoilerplateFile      string                 `mapstructure:"boilerplate-file"`
 	BuildTags            string                 `mapstructure:"tags"`
 	Case                 string                 `mapstructure:"case"`
 	Config               string                 `mapstructure:"config"`
@@ -43,38 +43,38 @@ type Config struct {
 	DisableFuncMocks     bool                   `mapstructure:"disable-func-mocks"`
 	DisableVersionString bool                   `mapstructure:"disable-version-string"`
 	DryRun               bool                   `mapstructure:"dry-run"`
+	Exclude              []string               `mapstructure:"exclude"`
 	ExcludeRegex         string                 `mapstructure:"exclude-regex"`
 	Exported             bool                   `mapstructure:"exported"`
 	FileName             string                 `mapstructure:"filename"`
-	IncludeAutoGenerated bool                   `mapstructure:"include-auto-generated"`
-	IncludeRegex         string                 `mapstructure:"include-regex"`
 	InPackage            bool                   `mapstructure:"inpackage"`
 	InPackageSuffix      bool                   `mapstructure:"inpackage-suffix"`
+	IncludeAutoGenerated bool                   `mapstructure:"include-auto-generated"`
+	IncludeRegex         string                 `mapstructure:"include-regex"`
 	KeepTree             bool                   `mapstructure:"keeptree"`
 	LogLevel             string                 `mapstructure:"log-level"`
+	MockBuildTags        string                 `mapstructure:"mock-build-tags"`
 	MockName             string                 `mapstructure:"mockname"`
 	Name                 string                 `mapstructure:"name"`
 	Note                 string                 `mapstructure:"note"`
 	Outpkg               string                 `mapstructure:"outpkg"`
 	Output               string                 `mapstructure:"output"`
-	Packages             map[string]interface{} `mapstructure:"packages"`
 	Packageprefix        string                 `mapstructure:"packageprefix"`
+	Packages             map[string]interface{} `mapstructure:"packages"`
 	Print                bool                   `mapstructure:"print"`
 	Profile              string                 `mapstructure:"profile"`
 	Quiet                bool                   `mapstructure:"quiet"`
 	Recursive            bool                   `mapstructure:"recursive"`
-	Exclude              []string               `mapstructure:"exclude"`
+	ReplaceType          []string               `mapstructure:"replace-type"`
+	ResolveTypeAlias     bool                   `mapstructure:"resolve-type-alias"`
 	SrcPkg               string                 `mapstructure:"srcpkg"`
-	BoilerplateFile      string                 `mapstructure:"boilerplate-file"`
 	// StructName overrides the name given to the mock struct and should only be nonempty
 	// when generating for an exact match (non regex expression in -name).
-	StructName     string   `mapstructure:"structname"`
-	TestOnly       bool     `mapstructure:"testonly"`
-	UnrollVariadic bool     `mapstructure:"unroll-variadic"`
-	Version        bool     `mapstructure:"version"`
-	WithExpecter   bool     `mapstructure:"with-expecter"`
-	ReplaceType    []string `mapstructure:"replace-type"`
-
+	StructName     string `mapstructure:"structname"`
+	TestOnly       bool   `mapstructure:"testonly"`
+	UnrollVariadic bool   `mapstructure:"unroll-variadic"`
+	Version        bool   `mapstructure:"version"`
+	WithExpecter   bool   `mapstructure:"with-expecter"`
 	// Viper throws away case-sensitivity when it marshals into this struct. This
 	// destroys necessary information we need, specifically around interface names.
 	// So, we re-read the config into this map outside of viper.
@@ -98,6 +98,7 @@ func NewConfigFromViper(v *viper.Viper) (*Config, error) {
 		v.SetDefault("case", "camel")
 		v.SetDefault("dir", ".")
 		v.SetDefault("output", "./mocks")
+		v.SetDefault("resolve-type-alias", true)
 	} else {
 		v.SetDefault("dir", "mocks/{{.PackagePath}}")
 		v.SetDefault("filename", "mock_{{.InterfaceName}}.go")
@@ -107,6 +108,7 @@ func NewConfigFromViper(v *viper.Viper) (*Config, error) {
 		v.SetDefault("with-expecter", true)
 		v.SetDefault("dry-run", false)
 		v.SetDefault("log-level", "info")
+		v.SetDefault("resolve-type-alias", false)
 	}
 
 	if err := v.UnmarshalExact(c); err != nil {
diff --git a/pkg/generator.go b/pkg/generator.go
index 4f600c78b..91a8ed305 100644
--- a/pkg/generator.go
+++ b/pkg/generator.go
@@ -64,6 +64,7 @@ type GeneratorConfig struct {
 	UnrollVariadic       bool
 	WithExpecter         bool
 	ReplaceType          []string
+	ResolveTypeAlias     bool
 }
 
 // Generator is responsible for generating the string containing
@@ -521,6 +522,9 @@ func (g *Generator) renderType(ctx context.Context, typ types.Type) string {
 	case *types.Named:
 		return g.renderNamedType(ctx, t)
 	case *types.Alias:
+		if g.config.ResolveTypeAlias {
+			return g.renderType(ctx, t.Underlying())
+		}
 		return g.renderNamedType(ctx, t)
 	case *types.TypeParam:
 		if t.Constraint() != nil {