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import assertString from './util/assertString';
export default function rtrim(str, chars) {
assertString(str); // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#Escaping
var pattern = chars ? new RegExp("[".concat(chars.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), "]+$"), 'g') : /\s+$/g;
return str.replace(pattern, '');
}
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