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444 B
JavaScript

'use strict';
const get = require('../get');
module.exports = function isDefaultIdIndex(index) {
if (Array.isArray(index)) {
// Mongoose syntax
const keys = Object.keys(index[0]);
return keys.length === 1 && keys[0] === '_id' && index[0]._id !== 'hashed';
}
if (typeof index !== 'object') {
return false;
}
const key = get(index, 'key', {});
return Object.keys(key).length === 1 && key.hasOwnProperty('_id');
};