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packages/lib-service-seq-tracker/.gitignore

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+dist

packages/lib-service-seq-tracker/package.json

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+{
+  "name": "@hereconnect/lib-service-seq-tracker",
+  "version": "1.0.0",
+  "main": "src/serviceSeqTracker.ts",
+  "exports": {
+    ".": {
+      "import": "./src/serviceSeqTracker.ts",
+      "default": "./src/serviceSeqTracker.ts"
+    }
+  },
+  "files": ["src/**/*"],
+  "private": true,
+  "scripts": {
+    "lint": "tsc --noEmit src/serviceSeqTracker.ts",
+    "build": "pnpm run lint"
+  },
+  "devDependencies": {
+    "typescript": "~5.6.3",
+    "@types/node": "^20.17.6",
+    "@types/pouchdb-core": "^7.0.15"
+  }
+}

packages/lib-service-seq-tracker/src/serviceSeqTracker.ts

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+import { type defaults as PouchDB } from "pouchdb-core";
+
+export interface ServiceSeqTrackerDocument {
+  lastSeq: string | number;
+}
+
+export type ServiceSeqTrackerDatabase =
+  PouchDB.Database<ServiceSeqTrackerDocument>;
+
+export class ServiceSeqTracker {
+  /**
+   * @param _id
+   * @param serviceSeqTrackerDb
+   * @constructor
+   */
+  static async Init(
+    _id: string,
+    serviceSeqTrackerDb: ServiceSeqTrackerDatabase,
+  ) {
+    const doc = await serviceSeqTrackerDb.get(_id).catch((error) => {
+      if (error.name === "not_found") {
+        return {
+          _id,
+          lastSeq: "0",
+        };
+      }
+      throw error; // Re-throw other errors
+    });
+    return new ServiceSeqTracker(doc, serviceSeqTrackerDb);
+  }
+
+  private constructor(
+    private doc: ServiceSeqTrackerDocument,
+    private serviceSeqTrackerDb: ServiceSeqTrackerDatabase,
+  ) {}
+
+  get lastSeq() {
+    return this.doc.lastSeq;
+  }
+
+  checkNextSeq(seq: number | string) {
+    if (!this.doc) {
+    }
+    const next = parseInt(seq as string, 10);
+    const current = parseInt(this.doc.lastSeq as string, 10);
+    if (next < current) {
+      throw new Error(
+        `Sequence number is too old: ${seq} (${next} < ${current})`,
+      );
+    }
+  }
+
+  saveSeq(seq: number | string) {
+    this.doc.lastSeq = seq;
+    return this.serviceSeqTrackerDb.put(this.doc);
+  }
+}

packages/lib-service-seq-tracker/tsconfig.json

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+{
+  "compilerOptions": {
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "outDir": "./dist",
+    "strict": true,
+    "types": ["node"]
+  },
+  "include": ["index.ts"]
+}