infra: update file structure for util/internal (#3141)

1 files changed, 48 insertions, 0 deletions

diff --git a/src/utils/mersenne.ts b/src/utils/mersenne.ts
new file mode 100644
index 00000000..de415f91
--- /dev/null
+++ b/src/utils/mersenne.ts
@@ -0,0 +1,48 @@
+import { MersenneTwister19937 } from '../internal/mersenne';
+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.
+ */
+export function generateMersenne32Randomizer(): Randomizer {
+  const twister = new MersenneTwister19937();
+
+  twister.initGenrand(Math.ceil(Math.random() * Number.MAX_SAFE_INTEGER));
+
+  return {
+    next(): number {
+      return twister.genrandReal2();
+    },
+    seed(seed: number | number[]): void {
+      if (typeof seed === 'number') {
+        twister.initGenrand(seed);
+      } else if (Array.isArray(seed)) {
+        twister.initByArray(seed, seed.length);
+      }
+    },
+  };
+}
+
+/**
+ * Generates a MersenneTwister19937 randomizer with 53 bits of precision.
+ * This is the default randomizer used by faker starting with v9.0.
+ */
+export function generateMersenne53Randomizer(): Randomizer {
+  const twister = new MersenneTwister19937();
+
+  twister.initGenrand(Math.ceil(Math.random() * Number.MAX_SAFE_INTEGER));
+
+  return {
+    next(): number {
+      return twister.genrandRes53();
+    },
+    seed(seed: number | number[]): void {
+      if (typeof seed === 'number') {
+        twister.initGenrand(seed);
+      } else if (Array.isArray(seed)) {
+        twister.initByArray(seed, seed.length);
+      }
+    },
+  };
+}