39 lines
1014 B
JavaScript
39 lines
1014 B
JavaScript
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const isObj = val => !!val && !Array.isArray(val) && typeof val === 'object'
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const compare = (ak, bk, prefKeys) =>
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prefKeys.includes(ak) && !prefKeys.includes(bk) ? -1
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: prefKeys.includes(bk) && !prefKeys.includes(ak) ? 1
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: prefKeys.includes(ak) && prefKeys.includes(bk)
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? prefKeys.indexOf(ak) - prefKeys.indexOf(bk)
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: ak.localeCompare(bk, 'en')
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const sort = (replacer, seen) => (key, val) => {
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const prefKeys = Array.isArray(replacer) ? replacer : []
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if (typeof replacer === 'function')
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val = replacer(key, val)
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if (!isObj(val))
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return val
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if (seen.has(val))
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return seen.get(val)
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const ret = Object.entries(val).sort(
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([ak, av], [bk, bv]) =>
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isObj(av) === isObj(bv) ? compare(ak, bk, prefKeys)
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: isObj(av) ? 1
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: -1
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).reduce((set, [k, v]) => {
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set[k] = v
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return set
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}, {})
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seen.set(val, ret)
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return ret
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}
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module.exports = (obj, replacer, space = 2) =>
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JSON.stringify(obj, sort(replacer, new Map()), space)
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+ (space ? '\n' : '')
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