Make struct fields optional if they have default values (fixes #85)

Author: luttje

__tests__/test-data/offline-sites/gmod-wiki/struct-custom-entity-fields.ts

@@ -34,6 +34,8 @@ This can also be set from map, see <page>Sandbox Specific Mapping</page></item>
 <item name="CanProperty" type="function">Documented at <page>ENTITY:CanProperty</page>.</item>
 <item name="CanTool" type="function">Documented at <page>ENTITY:CanTool</page>.</item>
 
+<item name="DoNotDuplicate" type="boolean" default="false" realm="server">If set, the entity will not be duplicated via the built-in duplicator system.</item>
+
 <item name="CalcAbsolutePosition" type="function">Documented at <page>ENTITY:CalcAbsolutePosition</page>.</item>
 <item name="RenderOverride" type="function">Documented at <page>ENTITY:RenderOverride</page>.</item>
 
@@ -117,6 +119,10 @@ Custom_Entity_Fields.CanProperty = nil
 ---@type function
 Custom_Entity_Fields.CanTool = nil
 
+---If set, the entity will not be duplicated via the built-in duplicator system.
+---@type boolean?
+Custom_Entity_Fields.DoNotDuplicate = false
+
 ---Documented at ENTITY:CalcAbsolutePosition.
 ---@type function
 Custom_Entity_Fields.CalcAbsolutePosition = nil

src/api-writer/glua-api-writer.ts

@@ -325,7 +325,8 @@ export class GluaApiWriter {
       api += `---${wrapInComment(field.description)}\n`;
 
       const type = GluaApiWriter.transformType(field.type, field.callback);
-      api += `---@type ${type}\n`;
+      const optional = field.default ? '?' : '';
+      api += `---@type ${type}${optional}\n`;
       api += `${struct.name}.${GluaApiWriter.safeName(field.name)} = ${field.default ? this.writeType(type, field.default) : 'nil'}\n\n`;
     }