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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' : '')
|
|
