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name : symlink.js
 'use strict'

const u = require('universalify').fromPromise
const path = require('path')
const fs = require('../fs')

const { mkdirs, mkdirsSync } = require('../mkdirs')

const { symlinkPaths, symlinkPathsSync } = require('./symlink-paths')
const { symlinkType, symlinkTypeSync } = require('./symlink-type')

const { pathExists } = require('../path-exists')

const { areIdentical } = require('../util/stat')

async function createSymlink (srcpath, dstpath, type) {
  let stats
  try {
    stats = await fs.lstat(dstpath)
  } catch { }

  if (stats && stats.isSymbolicLink()) {
    const [srcStat, dstStat] = await Promise.all([
      fs.stat(srcpath),
      fs.stat(dstpath)
    ])

    if (areIdentical(srcStat, dstStat)) return
  }

  const relative = await symlinkPaths(srcpath, dstpath)
  srcpath = relative.toDst
  const toType = await symlinkType(relative.toCwd, type)
  const dir = path.dirname(dstpath)

  if (!(await pathExists(dir))) {
    await mkdirs(dir)
  }

  return fs.symlink(srcpath, dstpath, toType)
}

function createSymlinkSync (srcpath, dstpath, type) {
  let stats
  try {
    stats = fs.lstatSync(dstpath)
  } catch { }
  if (stats && stats.isSymbolicLink()) {
    const srcStat = fs.statSync(srcpath)
    const dstStat = fs.statSync(dstpath)
    if (areIdentical(srcStat, dstStat)) return
  }

  const relative = symlinkPathsSync(srcpath, dstpath)
  srcpath = relative.toDst
  type = symlinkTypeSync(relative.toCwd, type)
  const dir = path.dirname(dstpath)
  const exists = fs.existsSync(dir)
  if (exists) return fs.symlinkSync(srcpath, dstpath, type)
  mkdirsSync(dir)
  return fs.symlinkSync(srcpath, dstpath, type)
}

module.exports = {
  createSymlink: u(createSymlink),
  createSymlinkSync
}
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