consolidate bootstrap templates

Signed-off-by: Josh Romero <rmerqg@amazon.com>

src/legacy/ui/ui_render/bootstrap/app_bootstrap.js

@@ -36,14 +36,15 @@ import { resolve } from 'path';
 import { osdBundlesLoaderSource } from './osd_bundles_loader_source';
 
 export class AppBootstrap {
-  constructor({ templateData }) {
+  constructor({ templateData }, templateName = 'bootstrap') {
     this.templateData = { ...templateData, osdBundlesLoaderSource };
     this._rawTemplate = undefined;
+    this.templateName = templateName;
   }
 
   async getJsFile() {
     if (!this._rawTemplate) {
-      this._rawTemplate = await loadRawTemplate();
+      this._rawTemplate = await loadRawTemplate(this.templateName);
     }
 
     const template = Handlebars.compile(this._rawTemplate, {
@@ -63,8 +64,8 @@ export class AppBootstrap {
   }
 }
 
-function loadRawTemplate() {
-  const templatePath = resolve(__dirname, 'template.js.hbs');
+function loadRawTemplate(templateName) {
+  const templatePath = resolve(__dirname, `${templateName}.js.hbs`);
   return readFileAsync(templatePath);
 }
 

src/legacy/ui/ui_render/ui_render_mixin.js

@@ -38,7 +38,6 @@ import * as v8dark from '@elastic/eui/dist/eui_theme_next_dark.json';
 import * as UiSharedDeps from '@osd/ui-shared-deps';
 import { OpenSearchDashboardsRequest } from '../../../core/server';
 import { AppBootstrap } from './bootstrap';
-import { AppStartup } from './startup';
 import { getApmConfig } from '../apm';
 
 /**
@@ -231,15 +230,18 @@ export function uiRenderMixin(osdServer, server, config) {
         v8: 'Source Code Pro',
       });
 
-      const startup = new AppStartup({
-        templateData: {
-          configDarkMode,
-          configThemeVersion,
-          THEME_SOURCES,
-          fontText,
-          fontCode,
+      const startup = new AppBootstrap(
+        {
+          templateData: {
+            configDarkMode,
+            configThemeVersion,
+            THEME_SOURCES,
+            fontText,
+            fontCode,
+          },
         },
-      });
+        'startup'
+      );
 
       const body = await startup.getJsFile();
       const etag = await startup.getJsFileHash();