patch-eslint6.js

// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
// See LICENSE in the project root for license information.

// This is a workaround for https://github.com/eslint/eslint/issues/3458
//
// To correct how ESLint searches for plugin packages, add this line to the top of your project's .eslintrc.js file:
//
//    require("@microsoft/eslint-config-scalable-ts/patch-eslint");
//
const path = require('path');

let currentModule = module;
while (!/[\\/]eslint[\\/]lib[\\/]cli-engine[\\/]config-array-factory\.js/i.test(currentModule.filename)) {
  if (!currentModule.parent) {
    // This was tested with ESLint 6.1.0; other versions may not work
    throw new Error('Failed to patch ESLint because the calling module was not recognized');
  }
  currentModule = currentModule.parent;
}
const eslintFolder = path.join(path.dirname(currentModule.filename), '../..');

const configArrayFactoryPath = path.join(eslintFolder, "lib/cli-engine/config-array-factory");
const ConfigArrayFactory = require(configArrayFactoryPath).ConfigArrayFactory;

if (!ConfigArrayFactory.__patched) {
  ConfigArrayFactory.__patched = true;

  const moduleResolverPath = path.join(eslintFolder, "lib/shared/relative-module-resolver");
  const ModuleResolver = require(moduleResolverPath);

  const originalLoadPlugin = ConfigArrayFactory.prototype._loadPlugin;
  ConfigArrayFactory.prototype._loadPlugin = function(name, importerPath, importerName) {
    const originalResolve = ModuleResolver.resolve;
    try {
      ModuleResolver.resolve = function (moduleName, relativeToPath) {
        // resolve using importerPath instead of relativeToPath
        return originalResolve.call(this, moduleName, importerPath);
      };
      return originalLoadPlugin.apply(this, arguments);
    } finally {
      ModuleResolver.resolve = originalResolve;
    }
  }
}