<commit_before>const utils = require('./object-utils');
const parse = require('./parse');

module.exports = function (obj, mergeKey) {
    if (!utils.isObject(obj)) {
        throw new Error('invalid argument: obj is not an object');
    }
<commit_msg>Add some JSDoc<commit_after>const utils = require('./object-utils');
const parse = require('./parse');

/**
 * @param {object} obj An object with tokens in it
 * @param {string} [mergeKey] A key to a sub object within the first argument
 * @return {object}
 */
module.exports = function (obj, mergeKey) {
    if (!utils.isObject(obj)) {
        throw new Error('invalid argument: obj is not an object');
    }

{'fraction_non_alphanumeric': 0.14954682779456194, 'fraction_numerical': 0.0, 'mean_word_length': 3.7357142857142858, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '4348571', 'n_tokens_mistral': 191, 'n_tokens_neox': 192, 'n_words': 68}