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webpackTools

A userscript for reverse engineering, debugging, and modifying sites using webpack.

Installing

The runtime with an example config for twitter can be installed from https://moonlight-mod.github.io/webpackTools/webpackTools.user.js

Usage

An example config exists in the userscript with all fields documented.

Spacepack Everywhere

By enabling spacepackEverywhere in your config, spacepack will automatically be injected into any webpack instances found.

spacepack will then be accessible from window.spacepack or window.spacepack_ if there happens to be multiple webpack instances

This version of spacepack is slightly different to the one in moonlight, however usage should be nearly the same. __namedRequire, chunkObject, and name are new to this version however.

TODO: Either write own docs about spacepack or link to moonlight docs

Full patching support

Patching and module injection are explained in the Moonlight docs.

Patches are nearly identical to Moonlight, minus the typing.

Module injection is different to Moonlight. Anything handled by dependencies in Moonlight is handled with needs in wpTools. Needs can be a string or regexp match for a module, or an object with a defined moduleId. Modules you define will only be injected after all their needs are met.

{
  name: "needsDemo", 
  // Set of strings, or regexes of modules that need to be loaded before injecting this one. can also be 
  // `{moduleId: <moduleId>}` if depending on other injected or named modules.
  needs: new Set(
    "stringMatch!",
    /regexpMatch/,
    {moduleId: "spacepack"} // Match by module id.
  ), 
  entry: true,
  run: function (module, exports, webpackRequire) {
    webpackRequire("spacepack")
    console.log("Module injection works!!!");
  },
},

Updating

To update to the latest webpackTools runtime while maintaining your existing config, edit your userscript and replace the string after const runtime = with https://moonlight-mod.github.io/webpackTools/webpackTools.runtime.json.

Caveats

Some sites, namely Discord, will start multiple webpack runtimes running on the same webpackChunk object. Duplicate runtimes can be found in window.wpTools.runtimes. Injected modules will run multiple times, one for each runtime.

Some sites don't expose their export cache, making spacepack.findModulesByExports unusable and spacepack.exports undefined.

In Firefox, clicking on links in stacktraces from functions with //# sourceURL= will send you to a blank page. It's best to just open them from the sources tab

Some sites have impropper scoping and patchAll will cause the page to fail to load. Patching will still work in isolation as long as you dont patch a module using impropper scoping

Credits

A lot of this is based on research by Mary and Cynthia (HH3), and Twilight Sparkle (webcrack, crispr, Endpwn)

Terminology

We use our own names for a lot of things as we feel they make more sense, however here's some mappings to webpack's "official" namings and it can be slightly confusing

  • modules, or module cache: moduleFactories
  • exports, or export cache: moduleCache
  • chunkObject (typically webpackJsonp or webpackChunk): chunkCallback or chunkLoadingGlobal