Add ES module

alea.esm.js

@@ -0,0 +1,92 @@
+/*!
+Alea
+Copyright (C) 2010 by Johannes Baagøe <baagoe@baagoe.org>
+https://github.com/coverslide/node-alea
+*/
+
+export default function Alea() {
+  return (function (args) {
+    // Johannes Baagøe <baagoe@baagoe.com>, 2010
+    var s0 = 0;
+    var s1 = 0;
+    var s2 = 0;
+    var c = 1;
+
+    if (args.length == 0) {
+      args = [+new Date];
+    }
+    var mash = Mash();
+    s0 = mash(' ');
+    s1 = mash(' ');
+    s2 = mash(' ');
+
+    for (var i = 0; i < args.length; i++) {
+      s0 -= mash(args[i]);
+      if (s0 < 0) {
+        s0 += 1;
+      }
+      s1 -= mash(args[i]);
+      if (s1 < 0) {
+        s1 += 1;
+      }
+      s2 -= mash(args[i]);
+      if (s2 < 0) {
+        s2 += 1;
+      }
+    }
+    mash = null;
+
+    var random = function () {
+      var t = 2091639 * s0 + c * 2.3283064365386963e-10; // 2^-32
+      s0 = s1;
+      s1 = s2;
+      return s2 = t - (c = t | 0);
+    };
+    random.next = random;
+    random.uint32 = function () {
+      return random() * 0x100000000; // 2^32
+    };
+    random.fract53 = function () {
+      return random() +
+        (random() * 0x200000 | 0) * 1.1102230246251565e-16; // 2^-53
+    };
+    random.version = 'Alea 0.9';
+    random.args = args;
+
+    // my own additions to sync state between two generators
+    random.exportState = function () {
+      return [s0, s1, s2, c];
+    };
+    random.importState = function (i) {
+      s0 = +i[0] || 0;
+      s1 = +i[1] || 0;
+      s2 = +i[2] || 0;
+      c = +i[3] || 0;
+    };
+
+    return random;
+
+  }(Array.prototype.slice.call(arguments)));
+}
+
+function Mash() {
+  var n = 0xefc8249d;
+
+  var mash = function (data) {
+    data = data.toString();
+    for (var i = 0; i < data.length; i++) {
+      n += data.charCodeAt(i);
+      var h = 0.02519603282416938 * n;
+      n = h >>> 0;
+      h -= n;
+      h *= n;
+      n = h >>> 0;
+      h -= n;
+      n += h * 0x100000000; // 2^32
+    }
+    return (n >>> 0) * 2.3283064365386963e-10; // 2^-32
+  };
+
+  mash.version = 'Mash 0.9';
+  return mash;
+}

package.json

@@ -3,6 +3,7 @@
   "version": "1.0.1",
   "description": "Implementation of the Alea PRNG by Johannes Baagøe",
   "main": "alea.js",
+  "module": "alea.esm.js",
   "scripts": {
     "test": "node test"
   },