lib: add validateInteger() validator

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

PR-URL: #20851
Fixes: #20844
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>

Author: cjihrig

lib/internal/validators.js

@@ -48,6 +48,20 @@ function validateAndMaskMode(value, name, def) {
   throw new ERR_INVALID_ARG_VALUE(name, value, modeDesc);
 }
 
+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) {
   // The defaults for min and max correspond to the limits of 32-bit integers.
   if (!isInt32(value)) {
@@ -93,6 +107,7 @@ module.exports = {
   isInt32,
   isUint32,
   validateAndMaskMode,
+  validateInteger,
   validateInt32,
   validateUint32
 };