From 0eab275b44c336c67c565ebe161b90aa6817100d Mon Sep 17 00:00:00 2001
From: Feross Aboukhadijeh <feross@feross.org>
Date: Thu, 1 Aug 2019 19:13:31 -0700
Subject: [PATCH] Remove deprecated flatten dependency

For: https://github.com/brave/brave-browser/issues/5490
---
 index.js     | 15 ++++++++++++---
 package.json |  1 -
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 2fd62662..be17c614 100644
--- a/index.js
+++ b/index.js
@@ -3,7 +3,6 @@ const BlockStream = require('block-stream2')
 const calcPieceLength = require('piece-length')
 const corePath = require('path')
 const FileReadStream = require('filestream/read')
-const flatten = require('flatten')
 const fs = require('fs')
 const isFile = require('is-file')
 const junk = require('junk')
@@ -13,6 +12,16 @@ const parallel = require('run-parallel')
 const sha1 = require('simple-sha1')
 const stream = require('readable-stream')
 
+// TODO: When Node 10 support is dropped, replace this Array.prototype.flat
+function flat (arr1) {
+  return arr1.reduce(
+    (acc, val) => Array.isArray(val)
+      ? acc.concat(flat(val))
+      : acc.concat(val),
+    []
+  )
+}
+
 const announceList = [
   ['udp://tracker.leechers-paradise.org:6969'],
   ['udp://tracker.coppersurfer.tk:6969'],
@@ -192,7 +201,7 @@ function _parseInput (input, opts, cb) {
       cb(null, file)
     }), (err, files) => {
       if (err) return cb(err)
-      files = flatten(files)
+      files = flat(files)
       cb(null, files, isSingleFileTorrent)
     })
   }
@@ -202,7 +211,7 @@ function getFiles (path, keepRoot, cb) {
   traversePath(path, getFileInfo, (err, files) => {
     if (err) return cb(err)
 
-    if (Array.isArray(files)) files = flatten(files)
+    if (Array.isArray(files)) files = flat(files)
     else files = [files]
 
     path = corePath.normalize(path)
diff --git a/package.json b/package.json
index 8458862b..9f267d5f 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,6 @@
     "bencode": "^2.0.0",
     "block-stream2": "^2.0.0",
     "filestream": "^5.0.0",
-    "flatten": "^1.0.2",
     "is-file": "^1.0.0",
     "junk": "^3.1.0",
     "minimist": "^1.1.0",