diff --git a/.changeset/rich-insects-jog.md b/.changeset/rich-insects-jog.md
new file mode 100644
index 0000000000..ed4edfda8d
--- /dev/null
+++ b/.changeset/rich-insects-jog.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+export Random.make taking hashable values as seed
diff --git a/packages/effect/src/Random.ts b/packages/effect/src/Random.ts
index 48af9ac255..8f6639a1e3 100644
--- a/packages/effect/src/Random.ts
+++ b/packages/effect/src/Random.ts
@@ -118,3 +118,12 @@ export const randomWith: (f: (random: Random) => Effect.Effect
* @category context
*/
export const Random: Context.Tag = internal.randomTag
+
+/**
+ * Constructs the `Random` service, seeding the pseudo-random number generator
+ * with an hash of the specified seed.
+ *
+ * @since 3.4.9
+ * @category constructors
+ */
+export const make: (seed: A) => Random = internal.make
diff --git a/packages/effect/src/internal/defaultServices.ts b/packages/effect/src/internal/defaultServices.ts
index bcc2ccda98..f8c6ade906 100644
--- a/packages/effect/src/internal/defaultServices.ts
+++ b/packages/effect/src/internal/defaultServices.ts
@@ -22,7 +22,7 @@ export const liveServices: Context.Context = pi
Context.empty(),
Context.add(clock.clockTag, clock.make()),
Context.add(console_.consoleTag, console_.defaultConsole),
- Context.add(random.randomTag, random.make((Math.random() * 4294967296) >>> 0)),
+ Context.add(random.randomTag, random.make(Math.random())),
Context.add(configProvider.configProviderTag, configProvider.fromEnv()),
Context.add(tracer.tracerTag, tracer.nativeTracer)
)
diff --git a/packages/effect/src/internal/random.ts b/packages/effect/src/internal/random.ts
index 609f2d0417..bb831d7ae1 100644
--- a/packages/effect/src/internal/random.ts
+++ b/packages/effect/src/internal/random.ts
@@ -2,6 +2,7 @@ import * as Chunk from "../Chunk.js"
import * as Context from "../Context.js"
import type * as Effect from "../Effect.js"
import { pipe } from "../Function.js"
+import * as Hash from "../Hash.js"
import type * as Random from "../Random.js"
import * as PCGRandom from "../Utils.js"
import * as core from "./core.js"
@@ -85,4 +86,4 @@ const swap = (buffer: Array, index1: number, index2: number): Array =>
return buffer
}
-export const make = (seed: number): Random.Random => new RandomImpl(seed)
+export const make = (seed: A): Random.Random => new RandomImpl(Hash.hash(seed))
diff --git a/packages/effect/test/Random.test.ts b/packages/effect/test/Random.test.ts
index b4fad2a5bc..5bcf690a09 100644
--- a/packages/effect/test/Random.test.ts
+++ b/packages/effect/test/Random.test.ts
@@ -1,4 +1,4 @@
-import { Array, Chunk, Effect, Random } from "effect"
+import { Array, Chunk, Data, Effect, Random } from "effect"
import * as it from "effect/test/utils/extend"
import { assert, describe } from "vitest"
@@ -10,4 +10,19 @@ describe("Random", () => {
assert.isTrue(Chunk.every(end, (n) => n !== undefined))
assert.deepStrictEqual(start.sort(), Array.fromIterable(end).sort())
}).pipe(Effect.repeatN(100)))
+
+ it.effect("make", () =>
+ Effect.gen(function*() {
+ const random0 = Random.make("foo")
+ const random1 = Random.make("foo")
+ const random2 = Random.make(Data.struct({ foo: "bar" }))
+ const random3 = Random.make(Data.struct({ foo: "bar" }))
+ const n0 = yield* random0.next
+ const n1 = yield* random1.next
+ const n2 = yield* random2.next
+ const n3 = yield* random3.next
+ assert.strictEqual(n0, n1)
+ assert.strictEqual(n2, n3)
+ assert.notStrictEqual(n0, n2)
+ }))
})