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17 lines
446 B
JavaScript
17 lines
446 B
JavaScript
'use strict';
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var escapeStringRegexp = require('escape-string-regexp');
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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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var reSep = escapeStringRegexp(sep);
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return str.replace(/([a-z\d])([A-Z])/g, '$1' + sep + '$2')
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.replace(new RegExp('(' + reSep + '[A-Z])([A-Z])', 'g'), '$1' + reSep + '$2')
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.toLowerCase();
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};
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