Migrate to TypeScript Native preview (tsgo)

Co-authored-by: mrlubos <12529395+mrlubos@users.noreply.github.com>

Author: Copilot

packages/codegen-core/package.json

@@ -44,7 +44,7 @@
     "check-exports": "attw --pack . --profile esm-only --ignore-rules cjs-resolves-to-esm",
     "dev": "tsdown --watch",
     "prepublishOnly": "pnpm build",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "dependencies": {
     "@hey-api/types": "workspace:*",

packages/json-schema-ref-parser/package.json

@@ -47,7 +47,7 @@
     "check-exports": "attw --pack . --profile esm-only --ignore-rules cjs-resolves-to-esm",
     "dev": "tsdown --watch",
     "prepublishOnly": "pnpm build",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "dependencies": {
     "@jsdevtools/ono": "7.1.3",

packages/openapi-python/package.json

@@ -56,7 +56,7 @@
     "check-exports": "attw --pack . --profile esm-only --ignore-rules cjs-resolves-to-esm",
     "dev": "tsdown --watch",
     "prepublishOnly": "pnpm build",
-    "typecheck": "tsc --noEmit",
+    "typecheck": "tsgo --noEmit",
     "typecheck:next": "tsc --noEmit && uv run mypy src/ts-python/__snapshots__"
   },
   "dependencies": {

packages/openapi-ts-tests/main/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "21.1.2",

packages/openapi-ts-tests/sdks/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "devDependencies": {
     "@hey-api/openapi-ts": "workspace:*",

packages/openapi-ts/package.json

@@ -66,7 +66,7 @@
     "check-exports": "attw --pack . --profile esm-only --ignore-rules cjs-resolves-to-esm",
     "dev": "tsdown --watch",
     "prepublishOnly": "pnpm build",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "dependencies": {
     "@hey-api/codegen-core": "workspace:*",

packages/shared/package.json

@@ -37,7 +37,7 @@
     "check-exports": "attw --pack . --profile esm-only --ignore-rules cjs-resolves-to-esm",
     "dev": "tsdown --watch",
     "prepublishOnly": "pnpm build",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "dependencies": {
     "@hey-api/codegen-core": "workspace:*",

packages/shared/src/index.ts

@@ -67,7 +67,15 @@ export type {
 export { createSchemaProcessor } from './ir/schema-processor';
 export type { SchemaVisitor, SchemaVisitorContext, Walker } from './ir/schema-walker';
 export { childContext, createSchemaWalker } from './ir/schema-walker';
-export type { IR } from './ir/types';
+export type {
+  IR,
+  IRModel,
+  IROperationObject,
+  IRParameterObject,
+  IRParametersObject,
+  IRSchemaObject,
+  IRServerObject,
+} from './ir/types';
 export { addItemsToSchema } from './ir/utils';
 export { parseOpenApiSpec } from './openApi';
 export type { OpenApiV2_0_X, OpenApiV2_0_XTypes } from './openApi/2.0.x';

packages/shared/src/ir/types.ts

@@ -52,14 +52,14 @@ export interface IROperationObject extends SpecificationExtensions {
   tags?: ReadonlyArray<string>;
 }
 
-interface IRParametersObject {
+export interface IRParametersObject {
   cookie?: Record<string, IRParameterObject>;
   header?: Record<string, IRParameterObject>;
   path?: Record<string, IRParameterObject>;
   query?: Record<string, IRParameterObject>;
 }
 
-interface IRParameterObject
+export interface IRParameterObject
   extends Pick<JsonSchemaDraft2020_12, 'deprecated' | 'description'>, SpecificationExtensions {
   /**
    * Determines whether the parameter value SHOULD allow reserved characters, as defined by RFC3986 `:/?#[]@!$&'()*+,;=` to be included without percent-encoding. The default value is `false`. This property SHALL be ignored if the request body media type is not `application/x-www-form-urlencoded` or `multipart/form-data`. If a value is explicitly defined, then the value of `contentType` (implicit or explicit) SHALL be ignored.
@@ -124,7 +124,7 @@ interface IRResponseObject {
   schema: IRSchemaObject;
 }
 
-interface IRSchemaObject
+export interface IRSchemaObject
   extends
     Pick<
       JsonSchemaDraft2020_12,
@@ -221,11 +221,12 @@ interface IRSchemaObject
 
 type IRSecurityObject = SecuritySchemeObject;
 
-type IRServerObject = ServerObject;
+// eslint-disable-next-line @typescript-eslint/no-empty-object-type -- Interface rather than type alias avoids TS4023 errors when bundled dist is consumed by tsgo/TypeScript 7
+export interface IRServerObject extends ServerObject {}
 
 type IRWebhookObject = IRPathItemObject;
 
-interface IRModel {
+export interface IRModel {
   components?: IRComponentsObject;
   paths?: IRPathsObject;
   servers?: ReadonlyArray<IRServerObject>;

packages/shared/src/openApi/3.1.x/parser/operation.ts

@@ -14,7 +14,7 @@ import { contentToSchema, mediaTypeObjects } from './mediaType';
 import { paginationField } from './pagination';
 import { parseExtensions, schemaToIrSchema } from './schema';
 
-interface Operation
+export interface Operation
   extends Omit<OperationObject, 'parameters'>, Pick<IR.OperationObject, 'parameters'> {}
 
 const parseOperationJsDoc = ({