Add void builtin type

Author: swallez

compiler/src/steps/validate-model.ts

@@ -149,7 +149,7 @@ export default async function validateModel (apiModel: model.Model, restSpec: Ma
 
   // Register builtin types
   for (const name of [
-    'string', 'boolean', 'number', 'null'
+    'string', 'boolean', 'number', 'null', 'void'
   ]) {
     const typeName = {
       namespace: '_builtins',

output/schema/validation-errors.json

@@ -39,7 +39,6 @@
     "async_search.get": {
       "request": [],
       "response": [
-        "type_alias definition _spec_utils:Void / instance_of - No type definition for '_builtins:void'",
         "type_alias definition _global.search._types:Suggest - A tagged union should not have generic parameters",
         "type_alias definition _global.search._types:Suggest / instance_of / Generics / instance_of - No type definition for '_global.search._types.Suggest:TDocument'",
         "type_alias definition _global.search._types:Suggest - Expected 1 generic parameters but got 0"