chore(helpers): move unique store into faker instance (#2072)

src/modules/helpers/index.ts

@@ -83,6 +83,14 @@ function getRepetitionsBasedOnQuantifierParameters(
  * A number of methods can generate strings according to various patterns: [`replaceSymbols()`](https://next.fakerjs.dev/api/helpers.html#replacesymbols), [`replaceSymbolWithNumber()`](https://next.fakerjs.dev/api/helpers.html#replacesymbolwithnumber), and [`fromRegExp()`](https://next.fakerjs.dev/api/helpers.html#fromregexp).
  */
 export class HelpersModule {
+  /**
+   * Global store of unique values.
+   * This means that faker should *never* return duplicate values across all API methods when using `faker.helpers.unique` without passing `options.store`.
+   *
+   * @internal
+   */
+  private readonly uniqueStore: Record<RecordKey, RecordKey> = {};
+
   constructor(private readonly faker: Faker) {
     // Bind `this` so namespaced is working correctly
     for (const name of Object.getOwnPropertyNames(
@@ -1335,13 +1343,20 @@ export class HelpersModule {
       until: '9.0',
     });
 
-    const { maxTime = 50, maxRetries = 50 } = options;
+    const {
+      maxTime = 50,
+      maxRetries = 50,
+      exclude = [],
+      store = this.uniqueStore,
+    } = options;
     return uniqueExec.exec(method, args, {
       ...options,
       startTime: new Date().getTime(),
       maxTime,
       maxRetries,
       currentIterations: 0,
+      exclude,
+      store,
     });
   }
 

src/modules/helpers/unique.ts

@@ -2,18 +2,6 @@ import { FakerError } from '../../errors/faker-error';
 
 export type RecordKey = string | number | symbol;
 
-/**
- * Global store of unique values.
- * This means that faker should *never* return duplicate values across all API methods when using `Faker.helpers.unique` without passing `options.store`.
- */
-const GLOBAL_UNIQUE_STORE: Record<RecordKey, RecordKey> = {};
-
-/**
- * Global exclude list of results.
- * Defaults to nothing excluded.
- */
-const GLOBAL_UNIQUE_EXCLUDE: RecordKey[] = [];
-
 /**
  * Uniqueness compare function.
  * Default behavior is to check value as key against object hash.
@@ -108,9 +96,9 @@ export function exec<
     maxTime = 50,
     maxRetries = 50,
     compare = defaultCompare,
-    store = GLOBAL_UNIQUE_STORE,
+    store,
   } = options;
-  let { exclude = GLOBAL_UNIQUE_EXCLUDE } = options;
+  let { exclude } = options;
   options.currentIterations = options.currentIterations ?? 0;
 
   // Support single exclude argument as string