chore: Add helper function

src/tools/injection.ts

@@ -0,0 +1,25 @@
+import { BrandedService, IInstantiationService, _util } from 'vs/platform/instantiation/common/instantiation'
+
+function getInjectedParameters<Ctor extends new (...args: any[]) => InstanceType<Ctor>> (instantiationService: IInstantiationService, ctor: Ctor) {
+  return instantiationService.invokeFunction((accessor) => {
+    return _util.getServiceDependencies(ctor).sort((a, b) => a.index - b.index).map(d => accessor.get(d.id))
+  })
+}
+
+declare type GetLeadingNonServiceArgs<Args> = Args extends [...BrandedService[]] ? [] : Args extends [infer A, ...BrandedService[]] ? [A] : Args extends [infer A, ...infer R] ? [A, ...GetLeadingNonServiceArgs<R>] : never
+
+/**
+ * Takes a class with injected services as parameters and returns a child class that only takes the injector as parameter
+ * @param ctor The class to inject
+ * @returns A class that only needs the injector
+ */
+export function createInjectedClass<Ctor extends new (...args: any[]) => InstanceType<Ctor>>(ctor: Ctor): new (instantiationService: IInstantiationService, ...args: GetLeadingNonServiceArgs<ConstructorParameters<Ctor>>) => InstanceType<Ctor> {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const _ctor = (ctor as (new (...args: any[]) => any))
+  return class extends _ctor {
+    constructor (...args: any[]) {
+      super(...args.slice(1), ...getInjectedParameters(args[0], ctor))
+    }
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  } as any
+}