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