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14 lines
323 B
JavaScript
14 lines
323 B
JavaScript
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'use strict';
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module.exports = function (str, sep) {
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if (typeof str !== 'string') {
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throw new TypeError('Expected a string');
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}
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sep = typeof sep === 'undefined' ? '_' : sep;
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return str
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.replace(/([a-z\d])([A-Z])/g, '$1' + sep + '$2')
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.replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + sep + '$2')
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.toLowerCase();
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};
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