fix(expo): remove deprecated webpack. (nrwl#26137)

config.js

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## Current Behavior
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Fixes nrwl#26118
nrwl#25291
nrwl#23233

packages/expo/migrations.json

@@ -71,6 +71,12 @@
       "cli": "nx",
       "description": "Change webpack to metro in expo projects",
       "factory": "./src/migrations/update-19-0-0/change-webpack-to-metro"
+    },
+    "update-19-2-0-remove-webpack-config": {
+      "version": "19.2.0-beta.2",
+      "cli": "nx",
+      "description": "Remove deprecated webpack.config.js",
+      "factory": "./src/migrations/update-19-2-0/remove-deprecated-webpack-config"
     }
   },
   "packageJsonUpdates": {

packages/expo/src/migrations/update-19-0-0/change-webpack-to-metro.ts

@@ -23,12 +23,14 @@ export default async function update(tree: Tree) {
         config.targets['export-web'].options.bundler = 'metro';
       }
 
-      updateJson(tree, `${config.root}/app.json`, (appJson) => {
-        if (appJson.expo?.web) {
-          appJson.expo.web.bundler = 'metro';
-        }
-        return appJson;
-      });
+      if (tree.exists(`${config.root}/app.json`)) {
+        updateJson(tree, `${config.root}/app.json`, (appJson) => {
+          if (appJson.expo?.web) {
+            appJson.expo.web.bundler = 'metro';
+          }
+          return appJson;
+        });
+      }
     }
 
     updateProjectConfiguration(tree, name, config);

packages/expo/src/migrations/update-19-2-0/remove-deprecated-webpack-config.spec.ts

@@ -0,0 +1,30 @@
+import { addProjectConfiguration, Tree } from '@nx/devkit';
+import { createTreeWithEmptyWorkspace } from '@nx/devkit/testing';
+import update from './remove-deprecated-webpack-config';
+
+describe('remove-deprecated-webpack-config', () => {
+  let tree: Tree;
+
+  beforeEach(async () => {
+    tree = createTreeWithEmptyWorkspace({ layout: 'apps-libs' });
+    addProjectConfiguration(tree, 'product', {
+      root: 'apps/product',
+      sourceRoot: 'apps/product/src',
+      targets: {
+        start: {
+          executor: '@nx/expo:start',
+        },
+      },
+    });
+    tree.write(
+      `apps/product/webpack.config.js`,
+      'module.exports = { /* webpack config */ };'
+    );
+  });
+
+  it(`should remove webpack.config.js`, async () => {
+    await update(tree);
+
+    expect(tree.exists('apps/product/webpack.config.js')).toBe(false);
+  });
+});

packages/expo/src/migrations/update-19-2-0/remove-deprecated-webpack-config.ts

@@ -0,0 +1,19 @@
+import { Tree, getProjects } from '@nx/devkit';
+import { removeSync } from 'fs-extra';
+import { join } from 'path';
+
+/**
+ * This function removes the deprecated webpack.config.js file from projects that use the expo:start executor
+ * @param tree
+ */
+export default async function update(tree: Tree) {
+  const projects = getProjects(tree);
+
+  for (const [_, config] of projects.entries()) {
+    if (config.targets?.['start']?.executor === '@nx/expo:start') {
+      if (tree.exists(join(config.root, 'webpack.config.js'))) {
+        tree.delete(join(config.root, 'webpack.config.js'));
+      }
+    }
+  }
+}