Redesign File writing and some tweaks

src/lock.ts

@@ -0,0 +1,36 @@
+export type Release = { release: () => void };
+export default class Lock {
+   private _locked: boolean = false;
+   get locked() {
+      return this._locked;
+   }
+   private toCome: (() => void)[] = [];
+
+   constructor() {
+      this.release = this.release.bind(this);
+   }
+
+   async getLock(): Promise<Release> {
+      if (!this._locked) return { release: this.lock() };
+      else {
+         return new Promise<Release>((resolve) => {
+            this.toCome.push(() => {
+               resolve({ release: this.lock() });
+            })
+         })
+      }
+   }
+
+   private lock() {
+      this._locked = true;
+      return this.release;
+   }
+
+   private async release() {
+      if (this.toCome.length > 0) {
+         this.toCome.shift()();
+      } else {
+         this._locked = false;
+      }
+   }
+}