lib: add validateInteger() validator

This allows validation of integers that are not int32 or uint32.

PR-URL: #20851
Fixes: #20844
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Backport-PR-URL: #21171
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

lib/internal/validators.js

@@ -13,7 +13,21 @@ function isUint32(value) {
   return value === (value >>> 0);
 }
 
-function validateInt32(value, name) {
+function validateInteger(value, name) {
+  let err;
+
+  if (typeof value !== 'number')
+    err = new ERR_INVALID_ARG_TYPE(name, 'number', value);
+  else if (!Number.isSafeInteger(value))
+    err = new ERR_OUT_OF_RANGE(name, 'an integer', value);
+
+  if (err) {
+    Error.captureStackTrace(err, validateInteger);
+    throw err;
+  }
+}
+
+function validateInt32(value, name, min = -2147483648, max = 2147483647) {
   if (!isInt32(value)) {
     let err;
     if (typeof value !== 'number') {
@@ -53,6 +67,7 @@ function validateUint32(value, name, positive) {
 module.exports = {
   isInt32,
   isUint32,
+  validateInteger,
   validateInt32,
   validateUint32
 };