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