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Webpack 5 Node Polyfills Upgrade Cheatsheet

Webpack 4 automatically polyfilled many Node APIs in the browser. This was not a great system, because it could lead to surprisingly giant libraries getting pulled into your app by accident, and it gave you no control over the exact versions of the polyfills you were using.

So Webpack 5 removed this functionality. That means you need to make changes if you were relying on those polyfills. This is a quick reference for how to replace the most common patterns.

List of polyfill packages that were used in webpack 4

For each automatically-polyfilled node package name on the left, this shows the name of the NPM package that was used to polyfill it on the right. Under webpack 5 you can manually install these packages and use them via resolve.fallback.

karpathy

"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np

# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)

barosl

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int addi(int a, int b) {
    return a + b;
}

char *adds(char *a, char *b) {
    char *res = malloc(strlen(a) + strlen(b) + 1);

quark-zju

#!/usr/bin/env python

try:
    import gdb
    inside_gdb = True
except ImportError:
    inside_gdb = False


if inside_gdb:

tkafka

The MIT License (MIT)

Copyright (c) 2014 Tomas Kafka

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

aroben

$ProcessesById = @{}
foreach ($Process in (Get-WMIObject -Class Win32_Process)) {
  $ProcessesById[$Process.ProcessId] = $Process
}

$ProcessesWithoutParents = @()
$ProcessesByParent = @{}
foreach ($Pair in $ProcessesById.GetEnumerator()) {
  $Process = $Pair.Value

AVGP

#!/bin/sh

### functions

f() { echo "Failed."; exit; }

setup_net()
{
  echo "Configuring network"
  while :; do

williscool

#!/bin/sh

PRIVATE_TOKEN="YOU_SECRET_TOKEN"
GITLAB_URL="http://gitlab.example.com/"

URL=`git config --get remote.origin.url`
PROJECT=`basename ${URL} .git | cut -d':' -f2`

COMMIT_MSG="git log -1 HEAD"
COMMIT_HASH_MSG=`git log -1 HEAD | head -1`

postmodern

#!/usr/bin/env ruby
#
# Proof-of-Concept exploit for Rails Remote Code Execution (CVE-2013-0156)
#
# ## Advisory
#
#   https://groups.google.com/forum/#!topic/rubyonrails-security/61bkgvnSGTQ/discussion
#
# ## Caveats
#

kazpsp

# app/controllers/users/password_controller.rb

class Users::PasswordsController < Devise::PasswordsController
  def resource_params
    params.require(:user).permit(:email, :password, :password_confirmation)
  end
  private :resource_params
end