From cca8ab61329d2a870a929b5e672f78665dc4ae85 Mon Sep 17 00:00:00 2001
From: Nicolas DUBIEN <github@dubien.org>
Date: Wed, 18 Mar 2026 00:07:23 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=EF=B8=8F=20No=20compute=20at=20import?=
 =?UTF-8?q?=20time=20(pre-computed)=20(#959)?=
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Instead of asking node to import the file and immediatelly run
computations to have shared globals ready for use, we just precomputed
their values ourself.
---
 src/distribution/uniformFloat32.ts | 5 ++---
 src/distribution/uniformFloat64.ts | 8 ++++----
 src/generator/congruential32.ts    | 2 +-
 src/generator/mersenne.ts          | 5 ++---
 4 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/src/distribution/uniformFloat32.ts b/src/distribution/uniformFloat32.ts
index b73abb0..04762c5 100644
--- a/src/distribution/uniformFloat32.ts
+++ b/src/distribution/uniformFloat32.ts
@@ -1,8 +1,7 @@
 import type { RandomGenerator } from '../types/RandomGenerator';
 
-const divisor = 1 << 24;
-const scale = 1 / divisor;
-const mask = divisor - 1;
+const scale = 5.960464477539063e-8; // = 1 / divisor (with divisor = 1 << 24)
+const mask = 16777215; // = divisor - 1
 
 /**
  * Uniformly generate random 32-bit floating point values between 0 (included) and 1 (excluded)
diff --git a/src/distribution/uniformFloat64.ts b/src/distribution/uniformFloat64.ts
index a540eed..91bc325 100644
--- a/src/distribution/uniformFloat64.ts
+++ b/src/distribution/uniformFloat64.ts
@@ -1,9 +1,9 @@
 import type { RandomGenerator } from '../types/RandomGenerator';
 
-const factor = 1 << 27;
-const scale = 2 ** -53;
-const mask1 = (1 << 26) - 1;
-const mask2 = (1 << 27) - 1;
+const factor = 134217728; // = 1 << 27
+const scale = 1.1102230246251565e-16; // = 2 ** -53
+const mask1 = 67108863; // = (1 << 26) - 1
+const mask2 = 134217727; // = (1 << 27) - 1
 
 /**
  * Uniformly generate random 64-bit floating point values between 0 (included) and 1 (excluded)
diff --git a/src/generator/congruential32.ts b/src/generator/congruential32.ts
index ee72dd3..81d9001 100644
--- a/src/generator/congruential32.ts
+++ b/src/generator/congruential32.ts
@@ -6,7 +6,7 @@ import type { JumpableRandomGenerator } from '../types/JumpableRandomGenerator';
 const MULTIPLIER: number = 0x000343fd;
 const INCREMENT: number = 0x00269ec3;
 const MASK: number = 0xffffffff;
-const MASK_2: number = (1 << 31) - 1;
+const MASK_2: number = -2147483649; // = (1 << 31) - 1
 
 // Jump constants: equivalent to 2^16 calls to next() (= 3 * 2^16 LCG steps).
 // Precomputed using the LCG jump-ahead algorithm from:
diff --git a/src/generator/mersenne.ts b/src/generator/mersenne.ts
index 7b70d44..77f9c3d 100644
--- a/src/generator/mersenne.ts
+++ b/src/generator/mersenne.ts
@@ -2,7 +2,6 @@ import type { JumpableRandomGenerator } from '../types/JumpableRandomGenerator';
 
 const N = 624;
 const M = 397;
-const R = 31;
 const A = 0x9908b0df;
 const F = 1812433253;
 const U = 11;
@@ -11,8 +10,8 @@ const B = 0x9d2c5680;
 const T = 15;
 const C = 0xefc60000;
 const L = 18;
-const MASK_LOWER = 2 ** R - 1;
-const MASK_UPPER = 2 ** R;
+const MASK_LOWER = 2147483647; // = 2 ** R - 1 (with R = 31)
+const MASK_UPPER = 2147483648; // = 2 ** R
 
 // Derived from https://github.com/numpy/numpy/blob/57fbc869cb10a65da0793ed3aebe00e7f595c0b1/numpy/random/src/mt19937/mt19937-jump.h#L26
 const JUMP_COEFS = [
-- 
2.51.2