Fix pg-query-stream by adding a compatible overload to query() (#15351)

pg-query-stream/index.d.ts

@@ -3,6 +3,10 @@
 // Definitions by: António Marques <https://github.com/asmarques>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+/// <reference types="node" />
+
+import stream = require("stream");
+
 declare namespace QueryStream {
     interface Options {
         highWaterMark?: number;
@@ -10,7 +14,7 @@ declare namespace QueryStream {
     }
 }
 
-declare class QueryStream {
+declare class QueryStream extends stream.Readable {
     batchSize: number;
     text: string;
     values?: any[];

pg-query-stream/pg-query-stream-tests.ts

@@ -10,10 +10,10 @@ const query = new QueryStream('SELECT * FROM generate_series(0, $1) num', [10000
 
 pg.connect('', (err, client, done) => {
     const stream = client.query(query);
-    stream.then(() => {
+    stream.on('end', () => {
         client.end();
     });
-    stream.then((data: any) => {
+    stream.on('data', (data: any) => {
         console.log(data);
     });
 });

pg/index.d.ts

@@ -89,6 +89,7 @@ export declare class Client extends events.EventEmitter {
     end(callback?: (err: Error) => void): void;
     release(): void;
 
+    query(queryStream: QueryConfig & stream.Readable): stream.Readable;
     query(queryTextOrConfig: string | QueryConfig): Promise<QueryResult>;
     query(queryText: string, values: any[]): Promise<QueryResult>;