feat: add initial seed parameter to constructors (#3220)

1 files changed, 13 insertions, 4 deletions

diff --git a/src/utils/mersenne.ts b/src/utils/mersenne.ts
index 315335ab..585f84b5 100644
--- a/src/utils/mersenne.ts
+++ b/src/utils/mersenne.ts
@@ -1,10 +1,13 @@
 import { MersenneTwister19937 } from '../internal/mersenne';
+import { randomSeed } from '../internal/seed';
 import type { Randomizer } from '../randomizer';
 
 /**
  * Generates a MersenneTwister19937 randomizer with 32 bits of precision.
  * This is the default randomizer used by faker prior to v9.0.
  *
+ * @param seed The initial seed to use. Defaults to a random number.
+ *
  * @example
  * import { de, en, generateMersenne32Randomizer, Faker } from '@faker-js/faker';
  *
@@ -16,10 +19,12 @@ import type { Randomizer } from '../randomizer';
  *
  * @since 8.2.0
  */
-export function generateMersenne32Randomizer(): Randomizer {
+export function generateMersenne32Randomizer(
+  seed: number = randomSeed()
+): Randomizer {
   const twister = new MersenneTwister19937();
 
-  twister.initGenrand(Math.ceil(Math.random() * Number.MAX_SAFE_INTEGER));
+  twister.initGenrand(seed);
 
   return {
     next(): number {
@@ -39,6 +44,8 @@ export function generateMersenne32Randomizer(): Randomizer {
  * Generates a MersenneTwister19937 randomizer with 53 bits of precision.
  * This is the default randomizer used by faker starting with v9.0.
  *
+ * @param seed The initial seed to use. Defaults to a random number.
+ *
  * @example
  * import { de, en, generateMersenne53Randomizer, Faker } from '@faker-js/faker';
  *
@@ -50,10 +57,12 @@ export function generateMersenne32Randomizer(): Randomizer {
  *
  * @since 9.0.0
  */
-export function generateMersenne53Randomizer(): Randomizer {
+export function generateMersenne53Randomizer(
+  seed: number = randomSeed()
+): Randomizer {
   const twister = new MersenneTwister19937();
 
-  twister.initGenrand(Math.ceil(Math.random() * Number.MAX_SAFE_INTEGER));
+  twister.initGenrand(seed);
 
   return {
     next(): number {