add adjustWebpackPlugin

api.md

@@ -35,6 +35,7 @@ This file documents the functions exported by `customize-cra`.
   - [removeModuleScopePlugin](#removemodulescopeplugin)
   - [watchAll](#watchall)
   - [adjustStyleLoaders](#adjustStyleLoaders)
+  - [adjustWebpackPlugin](#adjustWebpackPlugin)
 - [`utilities`](#utilities)
   - [getBabelLoader](#getbabelloaderconfig-isoutsideofapp)
   - [tap](#tapoptions)
@@ -476,6 +477,16 @@ adjustStyleLoaders(({ use: [ , css, postcss, resolve, processor ] }) => {
 })
 ```
 
+### adjustWebpackPlugin(name, callback)
+
+Find plugin and callback.
+
+```js
+adjustWebpackPlugin('HtmlWebpackPlugin', (plugin) => {});
+```
+
+You can find plugin and change options or anything else.
+
 ## `utilities`
 
 `utilities` are functions consumed by `customizers` in order to navigate their config.

src/customizers/__snapshots__/webpack.test.js.snap

@@ -102,6 +102,8 @@ Object {
 }
 `;
 
+exports[`adjustWebpackPlugin find plugin and callback 1`] = `FooPlugin {}`;
+
 exports[`adjustWorkbox calls the provided adjustment using the workbox plugin config 1`] = `
 Object {
   "plugins": Array [

src/customizers/webpack.js

@@ -80,6 +80,16 @@ export const adjustStyleLoaders = callback => config => {
   return config;
 };
 
+export const adjustWebpackPlugin = (name, callback) => config => {
+  for (let plugin of config.plugins) {
+    if (plugin.constructor.name === name) {
+      callback(plugin);
+      break;
+    }
+  }
+  return config;
+};
+
 export const useEslintRc = configFile => config => {
   const eslintRule = config.module.rules.filter(
     r => r.use && r.use.some(u => u.options && u.options.useEslintrc !== void 0)

src/customizers/webpack.test.js

@@ -10,6 +10,7 @@ import {
   addWebpackModuleRule,
   adjustWorkbox,
   adjustStyleLoaders,
+  adjustWebpackPlugin,
   watchAll,
   disableChunk,
   removeModuleScopePlugin,
@@ -175,6 +176,13 @@ test("adjustStyleLoaders find all style loaders and callback one by one", () =>
   adjustStyleLoaders(actual => expect(actual).toMatchSnapshot())(inputConfig);
 });
 
+test("adjustWebpackPlugin find plugin and callback", () => {
+  const FooPlugin = function () { };
+  const BarPlugin = function () { };
+  const inputConfig = { plugins: [ new FooPlugin(), new BarPlugin() ] };
+  adjustWebpackPlugin('FooPlugin', actual => expect(actual).toMatchSnapshot())(inputConfig);
+});
+
 test("addLessLoader", () => {});
 
 test("watchAll removes the watchOptions from config if --watch-all passed", () => {