chore: strengthen backend eslint profile

src/modules/investments/instruments/application/instrument-market.ts

@@ -1,15 +1,16 @@
-import { MILLISECONDS_PER_SECOND } from '../../../../common/time';
 import type {
   TbankCandle,
   TbankTimestamp,
 } from '../../../../integrations/tbank/tbank.api';
 
+import { MILLISECONDS_PER_SECOND } from '../../../../common/time';
+
 const MOSCOW_OFFSET_MS = 10_800_000;
-export function timestamp(value?: TbankTimestamp): string | null {
+export function timestamp(value?: TbankTimestamp): null | string {
   const seconds = Number(value?.seconds);
-  return Number.isFinite(seconds) && seconds > 0
-    ? new Date(seconds * MILLISECONDS_PER_SECOND).toISOString()
-    : null;
+  return Number.isFinite(seconds) && seconds > 0 ?
+      new Date(seconds * MILLISECONDS_PER_SECOND).toISOString() :
+    null;
 }
 export function moscowDay(iso: string): string {
   return new Date(Date.parse(iso) + MOSCOW_OFFSET_MS)
@@ -19,7 +20,7 @@ export function moscowDay(iso: string): string {
 export function previousClose(
   candles: TbankCandle[],
   priceAt: string,
-): TbankCandle | null {
+): null | TbankCandle {
   return (
     candles
       .filter((candle) => {
@@ -32,6 +33,6 @@ export function previousClose(
         );
       })
       .sort((a, b) => Number(b.time?.seconds) - Number(a.time?.seconds))[0] ??
-    null
+      null
   );
 }