refactor: replace ignored numeric literals with constants

src/integrations/moex/moex.client.ts

@@ -1,6 +1,12 @@
 import { Injectable, ServiceUnavailableException } from '@nestjs/common';
 import { constants as httpStatus } from 'node:http2';
 
+const MIN_PRICE_PERCENT_EXCLUSIVE = 0;
+const FIRST_PAGE_OFFSET = 0;
+const EXPECTED_CURSOR_ROWS = 1;
+const EMPTY_PAGE_SIZE = 0;
+const MIN_CURSOR_VALUE = 0;
+
 const FALLBACK_PAGE_SIZE = 100;
 
 const baseUrl = 'https://iss.moex.com/iss';
@@ -52,7 +58,7 @@ export class MoexClient {
     if (
       value === null ||
       pricePercent === null ||
-      Number(pricePercent) <= 0 ||
+      Number(pricePercent) <= MIN_PRICE_PERCENT_EXCLUSIVE ||
       !date ||
       !/^\d{4}-\d{2}-\d{2}$/.test(date) ||
       !Number.isFinite(Date.parse(date)) ||
@@ -114,7 +120,7 @@ export class MoexClient {
     paginated = true,
   ): Promise<Record<string, unknown>[]> {
     const rows: Record<string, unknown>[] = [];
-    let start = 0;
+    let start = FIRST_PAGE_OFFSET;
     for (;;) {
       const query = new URLSearchParams({
         'iss.meta': 'off',
@@ -139,11 +145,11 @@ export class MoexClient {
       const total = integer(cursor?.total);
       const pageSize = integer(cursor?.pagesize);
       if (
-        cursors.length !== 1 ||
+        cursors.length !== EXPECTED_CURSOR_ROWS ||
         index !== start ||
         total === null ||
         pageSize === null ||
-        pageSize === 0 ||
+        pageSize === EMPTY_PAGE_SIZE ||
         current.length !== Math.min(pageSize, total - start)
       ) {
         throw new ServiceUnavailableException({ code: 'MOEX_UNAVAILABLE' });
@@ -207,5 +213,5 @@ function currencyText(value: unknown): null | string {
 
 function integer(value: unknown): null | number {
   const result = Number(numberText(value) ?? NaN);
-  return Number.isSafeInteger(result) && result >= 0 ? result : null;
+  return Number.isSafeInteger(result) && result >= MIN_CURSOR_VALUE ? result : null;
 }