fix: do not use fs/promises for Node.js 12 compatibility

lib/resolveGitRepo.js

@@ -2,22 +2,26 @@
 
 const normalize = require('normalize-path')
 const debugLog = require('debug')('lint-staged:resolveGitRepo')
-const fs = require('fs/promises')
+const fs = require('fs')
 const path = require('path')
+const { promisify } = require('util')
 
 const execGit = require('./execGit')
 
+const fsLstat = promisify(fs.lstat)
+const fsReadFile = promisify(fs.readFile)
+
 /**
  * Resolve path to the .git directory, with special handling for
  * submodules and worktrees
  */
 const resolveGitConfigDir = async (gitDir) => {
   const defaultDir = normalize(path.join(gitDir, '.git'))
-  const stats = await fs.lstat(defaultDir)
+  const stats = await fsLstat(defaultDir)
   // If .git is a directory, use it
   if (stats.isDirectory()) return defaultDir
   // Otherwise .git is a file containing path to real location
-  const file = (await fs.readFile(defaultDir)).toString()
+  const file = (await fsReadFile(defaultDir)).toString()
   return path.resolve(gitDir, file.replace(/^gitdir: /, '')).trim()
 }
 

lib/unlink.js

@@ -1,7 +1,10 @@
 'use strict'
 
 const debug = require('debug')('lint-staged:file')
-const fs = require('fs/promises')
+const fs = require('fs')
+const { promisify } = require('util')
+
+const fsUnlink = promisify(fs.unlink)
 
 /**
  * Remove a file if it exists
@@ -10,7 +13,7 @@ const fs = require('fs/promises')
 const unlink = async (filename) => {
   debug('Removing file `%s`', filename)
   try {
-    await fs.unlink(filename)
+    await fsUnlink(filename)
   } catch (error) {
     debug("File `%s` doesn't exist, ignoring...", filename)
   }