Commit With Frontend and Backend in MERN

backend/node_modules/mongodb/src/operations/count.ts

@@ -0,0 +1,74 @@
+import type { Document } from '../bson';
+import type { Collection } from '../collection';
+import type { Server } from '../sdam/server';
+import type { ClientSession } from '../sessions';
+import { type TimeoutContext } from '../timeout';
+import type { MongoDBNamespace } from '../utils';
+import { CommandOperation, type CommandOperationOptions } from './command';
+import { Aspect, defineAspects } from './operation';
+
+/** @public */
+export interface CountOptions extends CommandOperationOptions {
+  /** The number of documents to skip. */
+  skip?: number;
+  /** The maximum amounts to count before aborting. */
+  limit?: number;
+  /**
+   * Number of milliseconds to wait before aborting the query.
+   */
+  maxTimeMS?: number;
+  /** An index name hint for the query. */
+  hint?: string | Document;
+}
+
+/** @internal */
+export class CountOperation extends CommandOperation<number> {
+  override options: CountOptions;
+  collectionName?: string;
+  query: Document;
+
+  constructor(namespace: MongoDBNamespace, filter: Document, options: CountOptions) {
+    super({ s: { namespace: namespace } } as unknown as Collection, options);
+
+    this.options = options;
+    this.collectionName = namespace.collection;
+    this.query = filter;
+  }
+
+  override get commandName() {
+    return 'count' as const;
+  }
+
+  override async execute(
+    server: Server,
+    session: ClientSession | undefined,
+    timeoutContext: TimeoutContext
+  ): Promise<number> {
+    const options = this.options;
+    const cmd: Document = {
+      count: this.collectionName,
+      query: this.query
+    };
+
+    if (typeof options.limit === 'number') {
+      cmd.limit = options.limit;
+    }
+
+    if (typeof options.skip === 'number') {
+      cmd.skip = options.skip;
+    }
+
+    if (options.hint != null) {
+      cmd.hint = options.hint;
+    }
+
+    if (typeof options.maxTimeMS === 'number') {
+      cmd.maxTimeMS = options.maxTimeMS;
+    }
+
+    const result = await super.executeCommand(server, session, cmd, timeoutContext);
+    return result ? result.n : 0;
+  }
+}
+
+defineAspects(CountOperation, [Aspect.READ_OPERATION, Aspect.RETRYABLE]);