Runtime: expose angular injector (#24262)

packages/grafana-runtime/src/services/index.ts

@@ -4,3 +4,4 @@ export * from './dataSourceSrv';
 export * from './LocationSrv';
 export * from './EchoSrv';
 export * from './templateSrv';
+export * from './legacyAngularInjector';

packages/grafana-runtime/src/services/legacyAngularInjector.ts

@@ -0,0 +1,23 @@
+import { auto } from 'angular';
+
+let singleton: auto.IInjectorService;
+
+/**
+ * Used during startup by Grafana to temporarily expose the angular injector to
+ * pure javascript plugins using {@link getLegacyAngularInjector}.
+ *
+ * @internal
+ */
+export const setLegacyAngularInjector = (instance: auto.IInjectorService) => {
+  singleton = instance;
+};
+
+/**
+ * WARNING: this function provides a temporary way for plugins to access anything in the
+ * angular injector.  While the migration from angular to react continues, there are a few
+ * options that do not yet have good alternatives.  Note that use of this function will
+ * be removed in the future.
+ *
+ * @beta
+ */
+export const getLegacyAngularInjector = (): auto.IInjectorService => singleton;