Fix package build with explicit index.js imports (#677)

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----

> [!IMPORTANT]
> Fixes ESM import issue by adding a plugin for implicit `index.js` and
renames interface files for consistency.
> 
>   - **Behavior**:
> - Adds `fixImportExtensions` plugin in `configs/tsup/js-library.ts` to
handle ESM imports with implicit `index.js`.
>   - **Renames**:
> - Renames `adminInterface.ts` to `admin-interface.ts` and updates
imports in `index.ts` and `admin-app-impl.ts`.
> - Renames `clientInterface.ts` to `client-interface.ts` and updates
imports in `server-interface.ts`.
> - Renames `serverInterface.ts` to `server-interface.ts` and updates
imports in `adminInterface.ts`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=stack-auth%2Fstack-auth&utm_source=github&utm_medium=referral)<sup>
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---------

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>
Co-authored-by: Konsti Wohlwend <n2d4xc@gmail.com>

configs/tsup/js-library.ts

@@ -1,10 +1,35 @@
+import fs from 'fs';
+import path from 'path';
 import { defineConfig } from 'tsup';
 import { createBasePlugin } from './plugins';
 
+
 const customNoExternal = new Set([
   "oauth4webapi",
 ]);
 
+// https://github.com/egoist/tsup/issues/953
+const fixImportExtensions = (extension: string = ".js")  => ({
+  name: "fix-import-extensions",
+  setup(build) {
+    build.onResolve({ filter: /.*/ }, (args) => {
+      if (args.importer) {
+        const filePath = path.join(args.resolveDir, args.path);
+        let resolvedPath;
+
+        
+        if (fs.existsSync(filePath + ".ts") || fs.existsSync(filePath + ".tsx")) {
+          resolvedPath = args.path + extension;
+        } else if (fs.existsSync(path.join(filePath, `index.ts`)) || fs.existsSync(path.join(filePath, `index.tsx`))) {
+          resolvedPath = args.path.endsWith("/") ? args.path + "index" + extension : args.path + "/index" + extension;
+        }
+        return { path: resolvedPath ?? args.path, external: true };
+      }
+    });
+  },
+});
+
+
 export default function createJsLibraryTsupConfig(options: { barrelFile: boolean }) {
   return defineConfig({
     entryPoints: ['src/**/*.(ts|tsx|js|jsx)'],
@@ -16,6 +41,7 @@ export default function createJsLibraryTsupConfig(options: { barrelFile: boolean
     format: ['esm', 'cjs'],
     legacyOutput: true,
     esbuildPlugins: [
+      fixImportExtensions(),
       createBasePlugin({}),
       {
         name: 'stackframe: force most files to be external',

packages/stack-shared/src/index.ts

@@ -1,12 +1,12 @@
 export {
   StackAdminInterface
-} from "./interface/adminInterface";
+} from "./interface/admin-interface";
 export {
   StackClientInterface
-} from "./interface/clientInterface";
+} from "./interface/client-interface";
 export {
   StackServerInterface
-} from "./interface/serverInterface";
+} from "./interface/server-interface";
 export {
   KnownError,
   KnownErrors

packages/stack-shared/src/interface/admin-interface.ts

@@ -6,7 +6,7 @@ import { ProjectPermissionDefinitionsCrud } from "./crud/project-permissions";
 import { ProjectsCrud } from "./crud/projects";
 import { SvixTokenCrud } from "./crud/svix-token";
 import { TeamPermissionDefinitionsCrud } from "./crud/team-permissions";
-import { ServerAuthApplicationOptions, StackServerInterface } from "./serverInterface";
+import { ServerAuthApplicationOptions, StackServerInterface } from "./server-interface";
 
 export type AdminAuthApplicationOptions = ServerAuthApplicationOptions &(
   | {

packages/stack-shared/src/interface/server-interface.ts

@@ -7,7 +7,7 @@ import { urlString } from "../utils/urls";
 import {
   ClientInterfaceOptions,
   StackClientInterface
-} from "./clientInterface";
+} from "./client-interface";
 import { ContactChannelsCrud } from "./crud/contact-channels";
 import { CurrentUserCrud } from "./crud/current-user";
 import { ConnectedAccountAccessTokenCrud } from "./crud/oauth";

packages/template/src/lib/stack-app/apps/implementations/admin-app-impl.ts

@@ -1,6 +1,6 @@
 import { StackAdminInterface } from "@stackframe/stack-shared";
 import { getProductionModeErrors } from "@stackframe/stack-shared/dist/helpers/production-mode";
-import { InternalApiKeyCreateCrudResponse } from "@stackframe/stack-shared/dist/interface/adminInterface";
+import { InternalApiKeyCreateCrudResponse } from "@stackframe/stack-shared/dist/interface/admin-interface";
 import { EmailTemplateCrud, EmailTemplateType } from "@stackframe/stack-shared/dist/interface/crud/email-templates";
 import { InternalApiKeysCrud } from "@stackframe/stack-shared/dist/interface/crud/internal-api-keys";
 import { ProjectsCrud } from "@stackframe/stack-shared/dist/interface/crud/projects";

packages/template/src/lib/stack-app/internal-api-keys/index.ts

@@ -1,4 +1,5 @@
-import { InternalApiKeyCreateCrudRequest } from "@stackframe/stack-shared/dist/interface/adminInterface";
+
+import { InternalApiKeyCreateCrudRequest } from "@stackframe/stack-shared/dist/interface/admin-interface";
 import { InternalApiKeysCrud } from "@stackframe/stack-shared/dist/interface/crud/internal-api-keys";
 
 export type InternalApiKeyBase = {