fix(nextjs): refactor how webpack config is loaded with nextjs

nx-dev/nx-dev/next.config.js

@@ -1,5 +1,5 @@
 // nx-ignore-next-line
-const withNx = require('@nrwl/next/plugins/with-nx');
+const { withNx } = require('@nrwl/next/plugins/with-nx');
 const { copySync } = require('fs-extra');
 const path = require('path');
 const redirectRules = require('./redirect-rules.config');

packages/next/plugins/with-nx.spec.ts

@@ -1,10 +1,10 @@
 import { NextConfigComplete } from 'next/dist/server/config-shared';
-import { withNx } from './with-nx';
+import { getNextConfig } from './with-nx';
 
 describe('withNx', () => {
   describe('svgr', () => {
     it('should be used by default', () => {
-      const config = withNx({});
+      const config = getNextConfig();
 
       const result = config.webpack(
         {
@@ -32,7 +32,7 @@ describe('withNx', () => {
     });
 
     it('should not be used when disabled', () => {
-      const config = withNx({
+      const config = getNextConfig({
         nx: {
           svgr: false,
         },

packages/next/plugins/with-nx.ts

@@ -1,5 +1,22 @@
+import {
+  createProjectGraphAsync,
+  joinPathFragments,
+  offsetFromRoot,
+  parseTargetString,
+  ProjectGraph,
+  ProjectGraphProjectNode,
+  Target,
+  workspaceRoot,
+} from '@nrwl/devkit';
+import {
+  calculateProjectDependencies,
+  DependentBuildableProjectNode,
+} from '@nrwl/js/src/utils/buildable-libs-utils';
 import type { NextConfig } from 'next';
 
+import path = require('path');
+import { createWebpackConfig } from '../src/utils/config';
+import { NextBuildBuilderOptions } from '@nrwl/next';
 export interface WithNxOptions extends NextConfig {
   nx?: {
     svgr?: boolean;
@@ -34,7 +51,128 @@ function getWithNxContext(): WithNxContext {
   };
 }
 
+function getTargetConfig(graph: ProjectGraph, target: Target) {
+  const projectNode = graph.nodes[target.project];
+  return projectNode.data.targets[target.target];
+}
+
+function getOptions(graph: ProjectGraph, target: Target) {
+  const targetConfig = getTargetConfig(graph, target);
+  const options = targetConfig.options;
+  if (target.configuration) {
+    Object.assign(options, targetConfig.configurations[target.configuration]);
+  }
+
+  return options;
+}
+
+function getNxContext(
+  graph: ProjectGraph,
+  target: Target
+): {
+  node: ProjectGraphProjectNode;
+  options: NextBuildBuilderOptions;
+  projectName: string;
+  targetName: string;
+  configurationName?: string;
+} {
+  const targetConfig = getTargetConfig(graph, target);
+
+  if ('@nrwl/next:build' === targetConfig.executor) {
+    return {
+      node: graph.nodes[target.project],
+      options: getOptions(graph, target),
+      projectName: target.project,
+      targetName: target.target,
+      configurationName: target.configuration,
+    };
+  }
+
+  const targetOptions = getOptions(graph, target);
+
+  // If we are running serve or export pull the options from the dependent target first (ex. build)
+  if (targetOptions.devServerTarget) {
+    const devServerTarget = parseTargetString(
+      targetOptions.devServerTarget,
+      graph
+    );
+
+    return getNxContext(graph, devServerTarget);
+  } else if (
+    ['@nrwl/next:server', '@nrwl/next:export'].includes(targetConfig.executor)
+  ) {
+    const buildTarget = parseTargetString(targetOptions.buildTarget, graph);
+    return getNxContext(graph, buildTarget);
+  } else {
+    throw new Error(
+      'Could not determine the config for this Next application.'
+    );
+  }
+}
+
 export function withNx(
+  _nextConfig = {} as WithNxOptions,
+  context: WithNxContext = getWithNxContext()
+): () => Promise<NextConfig> {
+  return async () => {
+    let dependencies: DependentBuildableProjectNode[] = [];
+
+    const graph = await createProjectGraphAsync();
+
+    const originalTarget = {
+      project: process.env.NX_TASK_TARGET_PROJECT,
+      target: process.env.NX_TASK_TARGET_TARGET,
+      configuration: process.env.NX_TASK_TARGET_CONFIGURATION,
+    };
+
+    const {
+      node: projectNode,
+      options,
+      projectName: project,
+      targetName,
+      configurationName,
+    } = getNxContext(graph, originalTarget);
+    const projectDirectory = projectNode.data.root;
+
+    if (!options.buildLibsFromSource && targetName) {
+      const result = calculateProjectDependencies(
+        graph,
+        workspaceRoot,
+        project,
+        targetName,
+        configurationName
+      );
+      dependencies = result.dependencies;
+    }
+
+    // Get next config
+    const nextConfig = getNextConfig(_nextConfig, context);
+
+    const outputDir = `${offsetFromRoot(projectDirectory)}${
+      options.outputPath
+    }`;
+    nextConfig.distDir =
+      nextConfig.distDir && nextConfig.distDir !== '.next'
+        ? joinPathFragments(outputDir, nextConfig.distDir)
+        : joinPathFragments(outputDir, '.next');
+
+    const userWebpackConfig = nextConfig.webpack;
+
+    nextConfig.webpack = (a, b) =>
+      createWebpackConfig(
+        workspaceRoot,
+        options.root,
+        options.fileReplacements,
+        options.assets,
+        dependencies,
+        path.join(workspaceRoot, context.libsDir)
+      )(userWebpackConfig ? userWebpackConfig(a, b) : a, b);
+
+    return nextConfig;
+  };
+}
+
+export function getNextConfig(
   nextConfig = {} as WithNxOptions,
   context: WithNxContext = getWithNxContext()
 ): NextConfig {
@@ -223,3 +361,4 @@ function addNxEnvVariables(config: any) {
 module.exports = withNx;
 // Support for newer generated code: `const { withNx } = require(...);`
 module.exports.withNx = withNx;
+module.exports.getNextConfig = getNextConfig;

packages/next/src/executors/build/build.impl.ts

@@ -2,7 +2,6 @@ import 'dotenv/config';
 import {
   ExecutorContext,
   readJsonFile,
-  workspaceLayout,
   workspaceRoot,
   writeJsonFile,
 } from '@nrwl/devkit';
@@ -12,18 +11,13 @@ import { join, resolve } from 'path';
 import { copySync, existsSync, mkdir, writeFileSync } from 'fs-extra';
 import { gte } from 'semver';
 import { directoryExists } from '@nrwl/workspace/src/utilities/fileutils';
-import {
-  calculateProjectDependencies,
-  DependentBuildableProjectNode,
-} from '@nrwl/js/src/utils/buildable-libs-utils';
 import { checkAndCleanWithSemver } from '@nrwl/devkit/src/utils/semver';
 
-import { prepareConfig } from '../../utils/config';
 import { updatePackageJson } from './lib/update-package-json';
 import { createNextConfigFile } from './lib/create-next-config-file';
 import { checkPublicDirectory } from './lib/check-project';
 import { NextBuildBuilderOptions } from '../../utils/types';
-import { PHASE_PRODUCTION_BUILD } from '../../utils/constants';
+
 import { getLockFileName } from 'nx/src/lock-file/lock-file';
 
 export default async function buildExecutor(
@@ -33,23 +27,10 @@ export default async function buildExecutor(
   // Cast to any to overwrite NODE_ENV
   (process.env as any).NODE_ENV ||= 'production';
 
-  let dependencies: DependentBuildableProjectNode[] = [];
   const root = resolve(context.root, options.root);
-  const libsDir = join(context.root, workspaceLayout().libsDir);
 
   checkPublicDirectory(root);
 
-  if (!options.buildLibsFromSource && context.targetName) {
-    const result = calculateProjectDependencies(
-      context.projectGraph,
-      context.root,
-      context.projectName,
-      context.targetName,
-      context.configurationName
-    );
-    dependencies = result.dependencies;
-  }
-
   // Set `__NEXT_REACT_ROOT` based on installed ReactDOM version
   const packageJsonPath = join(root, 'package.json');
   const packageJson = existsSync(packageJsonPath)
@@ -66,15 +47,7 @@ export default async function buildExecutor(
     (process.env as any).__NEXT_REACT_ROOT ||= 'true';
   }
 
-  const config = await prepareConfig(
-    PHASE_PRODUCTION_BUILD,
-    options,
-    context,
-    dependencies,
-    libsDir
-  );
-
-  await build(root, config as any);
+  await build(root);
 
   if (!directoryExists(options.outputPath)) {
     mkdir(options.outputPath);

packages/next/src/executors/export/export.impl.ts

@@ -3,7 +3,6 @@ import {
   ExecutorContext,
   parseTargetString,
   readTargetOptions,
-  runExecutor,
   workspaceLayout,
 } from '@nrwl/devkit';
 import exportApp from 'next/dist/export';
@@ -13,13 +12,18 @@ import {
   DependentBuildableProjectNode,
 } from '@nrwl/js/src/utils/buildable-libs-utils';
 
-import { prepareConfig } from '../../utils/config';
 import {
   NextBuildBuilderOptions,
   NextExportBuilderOptions,
 } from '../../utils/types';
 import { PHASE_EXPORT } from '../../utils/constants';
 import nextTrace = require('next/dist/trace');
+import { platform } from 'os';
+import { execFileSync } from 'child_process';
+import * as chalk from 'chalk';
+
+// platform specific command name
+const pmCmd = platform() === 'win32' ? `npx.cmd` : 'npx';
 
 export default async function exportExecutor(
   options: NextExportBuilderOptions,
@@ -38,27 +42,25 @@ export default async function exportExecutor(
   }
 
   const libsDir = join(context.root, workspaceLayout().libsDir);
-  const buildTarget = parseTargetString(options.buildTarget);
-  const build = await runExecutor(buildTarget, {}, context);
+  const buildTarget = parseTargetString(
+    options.buildTarget,
+    context.projectGraph
+  );
 
-  for await (const result of build) {
-    if (!result.success) {
-      return result;
-    }
+  try {
+    const args = getBuildTargetCommand(options);
+    execFileSync(pmCmd, args, {
+      stdio: [0, 1, 2],
+    });
+  } catch {
+    throw new Error(`Build target failed: ${chalk.bold(options.buildTarget)}`);
   }
 
   const buildOptions = readTargetOptions<NextBuildBuilderOptions>(
     buildTarget,
     context
   );
   const root = resolve(context.root, buildOptions.root);
-  const config = await prepareConfig(
-    PHASE_EXPORT,
-    buildOptions,
-    context,
-    dependencies,
-    libsDir
-  );
 
   // Taken from:
   // https://github.com/vercel/next.js/blob/ead56eaab68409e96c19f7d9139747bac1197aa9/packages/next/cli/next-export.ts#L13
@@ -72,9 +74,13 @@ export default async function exportExecutor(
       threads: options.threads,
       outdir: `${buildOptions.outputPath}/exported`,
     } as any,
-    nextExportCliSpan,
-    config
+    nextExportCliSpan
   );
 
   return { success: true };
 }
+
+function getBuildTargetCommand(options: NextExportBuilderOptions) {
+  const cmd = ['nx', 'run', options.buildTarget];
+  return cmd;
+}