more shims, path, crypto, url

shims/crypto/random-bytes.js

@@ -0,0 +1,20 @@
+// Shim for crypto.randomBytes
+// Uses Web Crypto API under the hood
+
+export function randomBytes(size) {
+  const buf = new Uint8Array(size);
+  crypto.getRandomValues(buf);
+
+  // Add Buffer-like convenience methods
+  buf.toString = function(encoding) {
+    if (encoding === 'hex') {
+      return Array.from(this).map(b => b.toString(16).padStart(2, '0')).join('');
+    }
+    if (encoding === 'base64') {
+      return btoa(String.fromCharCode(...this));
+    }
+    return new TextDecoder().decode(this);
+  };
+
+  return buf;
+}