feat(NODE-5590): deprecate GridFS fields (#3905)

Author: alenakhineika

src/gridfs/download.ts

@@ -44,10 +44,12 @@ export interface GridFSFile {
   length: number;
   chunkSize: number;
   filename: string;
-  contentType?: string;
-  aliases?: string[];
   metadata?: Document;
   uploadDate: Date;
+  /** @deprecated Will be removed in the next major version. */
+  contentType?: string;
+  /** @deprecated Will be removed in the next major version. */
+  aliases?: string[];
 }
 
 /** @internal */

src/gridfs/upload.ts

@@ -26,9 +26,15 @@ export interface GridFSBucketWriteStreamOptions extends WriteConcernOptions {
   id?: ObjectId;
   /** Object to store in the file document's `metadata` field */
   metadata?: Document;
-  /** String to store in the file document's `contentType` field */
+  /**
+   * String to store in the file document's `contentType` field.
+   * @deprecated Will be removed in the next major version. Add a contentType field to the metadata document instead.
+   */
   contentType?: string;
-  /** Array of strings to store in the file document's `aliases` field */
+  /**
+   * Array of strings to store in the file document's `aliases` field.
+   * @deprecated Will be removed in the next major version. Add an aliases field to the metadata document instead.
+   */
   aliases?: string[];
 }