Add support for new JSON struct tag option "omitzero"

README.md

@@ -41,6 +41,7 @@ type UserEntry struct {
 	MaybeFieldWithStar *string  `json:"address"`
 	Nickname           string   `json:"nickname,omitempty"`
 	Role               UserRole `json:"role"`
+  CreatedAt          time.Time `json:"created_at,omitzero"`
 
 	Complex    ComplexType `json:"complex"`
 	unexported bool        // Unexported fields are omitted
@@ -85,6 +86,7 @@ export interface UserEntry {
   address?: string;
   nickname?: string;
   role: UserRole;
+  created_at?: string /* RFC3339 */;
   complex: ComplexType;
 }
 export interface ListUsersResponse {

examples/simple/index.ts

@@ -27,6 +27,7 @@ export interface UserEntry {
   address?: string;
   nickname?: string;
   role: UserRole;
+  created_at?: string /* RFC3339 */;
   complex: ComplexType;
 }
 export interface ListUsersResponse {

examples/simple/simple.go

@@ -1,6 +1,10 @@
 package simple
 
-import "github.com/google/uuid"
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
 
 // Comments are kept :)
 type ComplexType map[string]map[uint16]*uint32
@@ -24,9 +28,10 @@ type UserEntry struct {
 		Bar uuid.UUID `json:"bar"`
 	} `json:"prefs"`
 
-	MaybeFieldWithStar *string  `json:"address"`
-	Nickname           string   `json:"nickname,omitempty"`
-	Role               UserRole `json:"role"`
+	MaybeFieldWithStar *string   `json:"address"`
+	Nickname           string    `json:"nickname,omitempty"`
+	Role               UserRole  `json:"role"`
+	CreatedAt          time.Time `json:"created_at,omitzero"`
 
 	Complex    ComplexType `json:"complex"`
 	unexported bool        // Unexported fields won't be in the output

tygo/write.go

@@ -320,7 +320,7 @@ func (g *PackageGenerator) writeStructFields(s *strings.Builder, fields []*ast.F
 					continue
 				}
 
-				optional = jsonTag.HasOption("omitempty")
+				optional = jsonTag.HasOption("omitempty") || jsonTag.HasOption("omitzero")
 			}
 			yamlTag, err := tags.Get("yaml")
 			if err == nil {