Deprecation Warning: The util.isArray API is deprecated. Please use Array.isArray() instead.

[Hari-Shankar-Karthik]

To the devs of connect-flash,

In my nodejs project, I used connect-flash to display messages like 'Comment created successfully', etc. when I got the following warning:

(node:4588) [DEP0044] DeprecationWarning: The util.isArray API is deprecated. Please use Array.isArray() instead.

The stacktrace tells me it originated from connect-flash\lib\flash.js:67:16 when I used node --trace-deprecation

Kindly change it as soon as possible.

Thank you!

[kukielski]

@Hari-Shankar-Karthik
I went into node_modules/connect-flash/lib/flash.js
Then I changed the line: var isArray = require('util').isArray;

to: var isArray = Array.isArray;

I know next to nothing in coding, but now the deprecation error went away for me. Not sure if this is the right solution, as I am still new to all this, but again, I don't have an error any longer.

[ecofi]

+1

[Freezler]

And how do you keep the changes from being overwritten when you delete your lock file and node_modules and do a install again?
Not that it a lot of work to corrwet it but in the spirit of not repeating to much i'm wondering
what could be a solution to this.. I made an .md with my own solution. but it was not well recieved and was told it was solvable in just 2 lines of code.

figured that part out but how do i make the change permanent?

thanks in advance!

[YasharF]

As a temporary workaround you can use a patch file.

1. Add patch-package to your project by npm install patch-package --save.
2. Add "postinstall": "patch-package" to the"scripts" section of your package.json.
3. Create a patches folder in your project and add the following as a file named connect-flash+0.1.1.patch in there.
4. Rerun npm install.

diff --git a/node_modules/connect-flash/lib/flash.js b/node_modules/connect-flash/lib/flash.js
index a278bc1..3870866 100644
--- a/node_modules/connect-flash/lib/flash.js
+++ b/node_modules/connect-flash/lib/flash.js
@@ -2,7 +2,6 @@
  * Module dependencies.
  */
 var format = require('util').format;
-var isArray = require('util').isArray;
 
 
 /**
@@ -64,7 +63,7 @@ function _flash(type, msg) {
     if (arguments.length > 2 && format) {
       var args = Array.prototype.slice.call(arguments, 1);
       msg = format.apply(undefined, args);
-    } else if (isArray(msg)) {
+    } else if (Array.isArray(msg)) {
       msg.forEach(function(val){
         (msgs[type] = msgs[type] || []).push(val);
       });