fix: restore RxJS 6 compatibility for Angular 21

Revert the branch to RxJS 6 and align published peer
constraints with upstream hyperdash requirements.
Add a shared Vitest runner config so Angular 21 tests
resolve correctly when RxJS 6 is installed.

Author: knagurski

README.md

@@ -11,6 +11,13 @@ Install Node + NPM
 
 `npm install`
 
+## RxJS Compatibility
+
+`@hypertrace/hyperdash-angular` currently uses `rxjs` `^6.5.5`.
+
+The library code is kept compatible with both RxJS 6 and RxJS 7 import styles where practical, but
+published compatibility currently follows `@hypertrace/hyperdash` peer requirements.
+
 ## Development server
 
 Run `npm start` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.

angular.json

@@ -83,6 +83,7 @@
             "buildTarget": "hyperdash-angular-app:build",
             "tsConfig": "tsconfig.spec.json",
             "runner": "vitest",
+            "runnerConfig": "vitest.config.ts",
             "reporters": ["default", ["junit", { "outputFile": "test-results/hyperdash-angular-app/results.xml" }]]
           }
         },
@@ -118,6 +119,7 @@
             "buildTarget": "hyperdash-angular:build",
             "tsConfig": "projects/hyperdash-angular/tsconfig.spec.json",
             "runner": "vitest",
+            "runnerConfig": "vitest.config.ts",
             "coverage": true,
             "coverageInclude": ["projects/hyperdash-angular/src/**/*.ts"],
             "coverageExclude": ["**/*.module.ts", "**/public_api.ts", "projects/hyperdash-angular/src/test/**"],

package-lock.json

@@ -26,7 +26,7 @@
     "@angular/platform-browser-dynamic": "^21.1.5",
     "@hypertrace/hyperdash": "^1.4.1",
     "lodash-es": "^4.17.21",
-    "rxjs": "^7.8.2",
+    "rxjs": "^6.5.5",
     "tslib": "^2.8.1"
   },
   "devDependencies": {

package.json

@@ -17,7 +17,7 @@
     "@angular/common": "^21.0.0",
     "@angular/core": "^21.0.0",
     "@angular/platform-browser": "^21.0.0",
-    "rxjs": "^7.8.2",
+    "rxjs": "^6.5.5",
     "lodash-es": "^4.17.21",
     "@hypertrace/hyperdash": "^1.3.0"
   },

projects/hyperdash-angular/package.json

@@ -0,0 +1,26 @@
+import { defineConfig } from 'vitest/config';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+const rxjsVersion: string = require('rxjs/package.json').version;
+const isRxjs6 = rxjsVersion.startsWith('6.');
+
+export default defineConfig({
+  resolve: {
+    alias: isRxjs6
+      ? {
+          // RxJS 6 does not expose directory imports through package exports.
+          'rxjs/operators': 'rxjs/operators/index.js',
+          'rxjs/testing': 'rxjs/testing/index.js'
+        }
+      : {}
+  },
+  test: {
+    server: {
+      deps: {
+        // Ensure Vite transforms dependencies instead of externalizing to Node.
+        inline: true
+      }
+    }
+  }
+});