56 lines
1.0 KiB
JavaScript
56 lines
1.0 KiB
JavaScript
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'use strict';
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const isPlainObj = require('is-plain-obj');
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module.exports = (obj, opts) => {
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if (!isPlainObj(obj)) {
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throw new TypeError('Expected a plain object');
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}
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opts = opts || {};
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// DEPRECATED
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if (typeof opts === 'function') {
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throw new TypeError('Specify the compare function as an option instead');
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}
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const deep = opts.deep;
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const seenInput = [];
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const seenOutput = [];
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const sortKeys = x => {
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const seenIndex = seenInput.indexOf(x);
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if (seenIndex !== -1) {
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return seenOutput[seenIndex];
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}
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const ret = {};
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const keys = Object.keys(x).sort(opts.compare);
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seenInput.push(x);
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seenOutput.push(ret);
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for (let i = 0; i < keys.length; i++) {
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const key = keys[i];
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const val = x[key];
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if (deep && Array.isArray(val)) {
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const retArr = [];
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for (let j = 0; j < val.length; j++) {
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retArr[j] = isPlainObj(val[j]) ? sortKeys(val[j]) : val[j];
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}
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ret[key] = retArr;
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continue;
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}
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ret[key] = deep && isPlainObj(val) ? sortKeys(val) : val;
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}
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return ret;
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};
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return sortKeys(obj);
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};
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