Replace use of mobx from runManyFor with custom barrier

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/common/runnable/run-many-for.ts

@@ -4,11 +4,12 @@
  */
 import type { DiContainerForInjection, InjectionToken } from "@ogre-tools/injectable";
 import type { SingleOrMany } from "../utils";
-import { getOrInsertSetFor, isDefined } from "../utils";
+import { getOrInsert, getOrInsertSetFor, isDefined } from "../utils";
-import { observable, when } from "mobx";
 import * as uuid from "uuid";
 import assert from "assert";
 import type { Asyncify } from "type-fest";
+import type TypedEventEmitter from "typed-emitter";
+import EventEmitter from "events";
 
 export interface Runnable<TParameter = void> {
   id: string;
@@ -80,18 +81,50 @@ const verifyRunnablesAreDAG = <Param>(injectionToken: InjectionToken<Runnable<Pa
   }
 };
 
+interface BarrierEvent {
+  finish: (id: string) => void;
+}
+
+class DynamicBarrier {
+  private readonly finishedIds = new Map<string, Promise<void>>();
+  private readonly events: TypedEventEmitter<BarrierEvent> = new EventEmitter();
+
+  private initFinishingPromise(id: string): Promise<void> {
+    return getOrInsert(this.finishedIds, id, new Promise(resolve => {
+      const handler = (finishedId: string) => {
+        if (finishedId === id) {
+          resolve();
+          this.events.removeListener("finish", handler);
+        }
+      };
+
+      this.events.addListener("finish", handler);
+    }));
+  }
+
+  setFinished(id: string): void {
+    void this.initFinishingPromise(id);
+
+    this.events.emit("finish", id);
+  }
+
+  async blockOn(id: string): Promise<void> {
+    await this.initFinishingPromise(id);
+  }
+}
+
 const executeRunnableWith = <Param>(param: Param) => {
-  const finishedIds = observable.set<string>();
+  const barrier = new DynamicBarrier();
 
   return async (runnable: Runnable<Param>): Promise<void> => {
     const parentRunnables = [runnable.runAfter].flat().filter(isDefined);
 
     for (const parentRunnable of parentRunnables) {
-      await when(() => finishedIds.has(parentRunnable.id));
+      await barrier.blockOn(parentRunnable.id);
     }
 
     await runnable.run(param);
-    finishedIds.add(runnable.id);
+    barrier.setFinished(runnable.id);
   };
 };