implement some GEO commands, improve scan generic transformer, expose RPUSHX

lib/commands/GEOSEARCHSTORE.ts

@@ -0,0 +1,40 @@
+import { GeoSearchFrom, GeoSearchBy, GeoSearchOptions, pushGeoSearchArguments, transformReplyNumber } from './generic-transformers';
+
+export const FIRST_KEY_INDEX = 1;
+
+export const IS_READ_ONLY = true;
+
+interface GeoSearchStoreOptions extends GeoSearchOptions {
+    STOREDIST?: true;
+}
+
+export function transformArguments(
+    destination: string,
+    source: string,
+    from: GeoSearchFrom,
+    by: GeoSearchBy,
+    options?: GeoSearchStoreOptions
+): Array<string> {
+    const args = pushGeoSearchArguments(
+        ['GEOSEARCHSTORE', destination],
+        source,
+        from,
+        by,
+        options
+    );
+
+    if (options?.STOREDIST) {
+        args.push('STOREDIST');
+    }
+
+    return args;
+}
+
+
+// in versions 6.2.0-6.2.4 Redis will return an empty array when `src` is empty
+// TODO: issue/PR
+export function transformReply(reply: number | []): number {
+    if (typeof reply === 'number') return reply;
+
+    return 0;
+}