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