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'use strict'; const { isFunction } = require('../helpers/is'); module.exports = function sole(key, operator, value) { let collection; if (isFunction(key)) { collection = this.filter(key); } else { collection = this.where(key, operator, value); } if (collection.isEmpty()) { throw new Error('Item not found.'); } if (collection.count() > 1) { throw new Error('Multiple items found.'); } return collection.first(); };