ubdate

node_modules/is-natural-number/index.js

@@ -0,0 +1,31 @@
+/*!
+ * is-natural-number.js | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/is-natural-number.js
+*/
+'use strict';
+
+module.exports = function isNaturalNumber(val, option) {
+  if (option) {
+    if (typeof option !== 'object') {
+      throw new TypeError(
+        String(option) +
+        ' is not an object. Expected an object that has boolean `includeZero` property.'
+      );
+    }
+
+    if ('includeZero' in option) {
+      if (typeof option.includeZero !== 'boolean') {
+        throw new TypeError(
+          String(option.includeZero) +
+          ' is neither true nor false. `includeZero` option must be a Boolean value.'
+        );
+      }
+
+      if (option.includeZero && val === 0) {
+        return true;
+      }
+    }
+  }
+
+  return Number.isSafeInteger(val) && val >= 1;
+};