Context

I am trying to add FilerWebpackPlugin to an existing Webpack configuration.

Problem

As soon as I require('filer'), Webpack starts failing because it cannot find the entry file anymore.

Analysis

This problem seems to be caused by a side effect in src/path.js:

/**
 * Patch process to add process.cwd(), always giving the root dir.
 * NOTE: this line needs to happen *before* we require in `path`.
 */
process.cwd = () => '/';

Workaround

The only workaround that I found is to save process.cwd before importing filer, and to restore it afterwards.

const cwd = process.cwd;
const filer = require('filer');
process.cwd = cwd;

With this fix, Webpack is able to find the entry file again.