Haha-Yes/node_modules/is-natural-number/index.jsnext.js
2018-09-09 21:20:36 +02:00

29 lines
774 B
JavaScript

/*!
* is-natural-number.js | MIT (c) Shinnosuke Watanabe
* https://github.com/shinnn/is-natural-number.js
*/
export default 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;
}