fix: example types

src/distributions/normal.test.ts

@@ -1,6 +1,7 @@
 import seedrandom from 'seedrandom'
 import { assert, test } from 'vitest'
 
+import type { SeedType } from '../types'
 import { RNGFunction } from '../../src/generators/function'
 import { RNGMathRandom } from '../../src/generators/math-random'
 import { RNGXOR128 } from '../../src/generators/xor128'
@@ -15,7 +16,7 @@ test('random.normal() produces numbers', () => {
   }
 })
 
-const meanN = <T>(t: T) => {
+const meanN = <T extends SeedType>(t: T) => {
   const r = random.clone(t)
   const d = r.normal(120)
   let sum = 0

src/random.ts

@@ -1,4 +1,5 @@
 import type { RNG } from './rng'
+import type { SeedType } from './types'
 import { bates } from './distributions/bates'
 import { bernoulli } from './distributions/bernoulli'
 import { binomial } from './distributions/binomial'
@@ -50,7 +51,7 @@ export class Random {
   } = {}
   protected _patch?: typeof Math.random
 
-  constructor(rng: RNG = new RNGMathRandom()) {
+  constructor(rng: SeedType = new RNGMathRandom()) {
     this.use(rng)
   }
 
@@ -71,12 +72,8 @@ export class Random {
    * @param {object} [opts] - Optional config for new RNG options.
    * @return {Random}
    */
-  clone<T>(...args: [T]): Random {
-    if (args.length) {
-      return new Random(RNGFactory(...args))
-    } else {
-      return new Random(this.rng.clone())
-    }
+  clone(rng: SeedType = this.rng.clone()): Random {
+    return new Random(rng)
   }
 
   /**
@@ -97,8 +94,8 @@ export class Random {
    *
    * @param {...*} args
    */
-  use(...args: [RNG]) {
-    this._rng = RNGFactory(...args)
+  use(rng?: SeedType) {
+    this._rng = RNGFactory(rng)
   }
 
   /**

src/seed.test.ts

@@ -1,7 +1,7 @@
 import seedrandom from 'seedrandom'
 import { expect, test } from 'vitest'
 
-import random from '../src/random'
+import random, { Random } from '../src/random'
 
 test('random.clone with seedrandom rng is consistent', () => {
   const r = random.clone(seedrandom('ZjExZDczNWQxY2NlZjUzYmRiZWU0ZGIz'))
@@ -26,3 +26,17 @@ test('random.clone with string seed is consistent', () => {
 
   expect(o).toMatchSnapshot()
 })
+
+test('Random constructor', () => {
+  const rng = new Random()
+  expect(rng).toBeDefined()
+
+  const rng2 = new Random(seedrandom('my-seed-string'))
+  expect(rng2).toBeDefined()
+
+  const rng3 = new Random(Math.random)
+  expect(rng3).toBeDefined()
+
+  const rng4 = new Random('example--seed-string')
+  expect(rng4).toBeDefined()
+})