extract version detection of nextjs & webpack out, add nextjs detection, add test

lib/cli/src/detect-nextjs.test.ts

@@ -0,0 +1,53 @@
+import { detectNextJS } from './detect-nextjs';
+
+test('detect nothing if it fails', () => {
+  const out = detectNextJS({
+    type: 'npm',
+    executeCommand: () => {
+      throw new Error('test error');
+    },
+  });
+  expect(out).toEqual(false);
+});
+
+test('detect from npm ls', () => {
+  const outputFromCommand = `
+/path/to/cwd
+└── next@12.0.7 
+  `;
+  const out = detectNextJS({ type: 'npm', executeCommand: () => outputFromCommand });
+  expect(out).toEqual(12);
+});
+
+test('detect from npm why', () => {
+  const outputFromCommand = `
+next@12.0.7
+node_modules/next
+  next@"^12.0.7" from the root project
+  peer next@">=10.2.0" from eslint-config-next@12.0.7
+  node_modules/eslint-config-next
+    dev eslint-config-next@"^12.0.7" from the root project
+`;
+  const out = detectNextJS({ type: 'npm', executeCommand: () => outputFromCommand });
+  expect(out).toEqual(12);
+});
+
+test('detect from yarn why', () => {
+  const outputFromCommand = `
+yarn why v1.22.18
+[1/4] 🤔  Why do we have the module "next"...?
+[2/4] 🚚  Initialising dependency graph...
+[3/4] 🔍  Finding dependency...
+[4/4] 🚡  Calculating file sizes...
+=> Found "next@12.0.7"
+info Has been hoisted to "next"
+info This module exists because it's specified in "dependencies".
+info Disk size without dependencies: "XX.XXMB"
+info Disk size with unique dependencies: "XX.XXMB"
+info Disk size with transitive dependencies: "XX.XXMB"
+info Number of shared dependencies: XXX
+✨  Done in 0.XXs.
+`;
+  const out = detectNextJS({ type: 'npm', executeCommand: () => outputFromCommand });
+  expect(out).toEqual(12);
+});

lib/cli/src/detect-nextjs.ts

@@ -0,0 +1,30 @@
+import { JsPackageManager } from './js-package-manager';
+
+const regex = /[\s"\n]next.*?(\d+).*/;
+
+export const detectNextJS = (
+  packageManager: Pick<JsPackageManager, 'type' | 'executeCommand'>
+): number | false => {
+  try {
+    let out = '';
+    if (packageManager.type === 'npm') {
+      try {
+        // npm <= v7
+        out = packageManager.executeCommand('npm', ['ls', 'next']);
+      } catch (e2) {
+        // npm >= v8
+        out = packageManager.executeCommand('npm', ['why', 'next']);
+      }
+    } else {
+      out = packageManager.executeCommand('yarn', ['why', 'next']);
+    }
+
+    const [, version] = out.match(regex);
+
+    return version && parseInt(version, 10) ? parseInt(version, 10) : false;
+  } catch (err) {
+    //
+  }
+
+  return false;
+};

lib/cli/src/detect-webpack.ts

@@ -0,0 +1,32 @@
+import type { JsPackageManager } from './js-package-manager';
+
+export const detectWebpack = (packageManager: JsPackageManager): number | false => {
+  try {
+    let out = '';
+    if (packageManager.type === 'npm') {
+      try {
+        // npm <= v7
+        out = packageManager.executeCommand('npm', ['ls', 'webpack']);
+      } catch (e2) {
+        // npm >= v8
+        out = packageManager.executeCommand('npm', ['why', 'webpack']);
+      }
+    } else {
+      out = packageManager.executeCommand('yarn', ['why', 'webpack']);
+    }
+
+    // if the user has BOTH webpack 4 and 5 installed already, we'll pick the safest options (4)
+    if (out.includes('webpack@4') || out.includes('webpack@npm:4')) {
+      return 4;
+    }
+
+    // the user has webpack 4 installed, but not 5
+    if (out.includes('webpack@5') || out.includes('webpack@npm:5')) {
+      return 5;
+    }
+  } catch (err) {
+    //
+  }
+
+  return false;
+};

lib/cli/src/detect.ts

@@ -14,6 +14,8 @@ import {
 } from './project_types';
 import { getBowerJson, paddedLog } from './helpers';
 import { PackageJson, readPackageJson, JsPackageManager } from './js-package-manager';
+import { detectWebpack } from './detect-webpack';
+import { detectNextJS } from './detect-nextjs';
 
 const viteConfigFiles = ['vite.config.ts', 'vite.config.js', 'vite.config.mjs'];
 
@@ -112,31 +114,21 @@ export function detectBuilder(packageManager: JsPackageManager) {
     return CoreBuilder.Vite;
   }
 
-  try {
-    let out = '';
-    if (packageManager.type === 'npm') {
-      try {
-        // npm <= v7
-        out = packageManager.executeCommand('npm', ['ls', 'webpack']);
-      } catch (e2) {
-        // npm >= v8
-        out = packageManager.executeCommand('npm', ['why', 'webpack']);
-      }
-    } else {
-      out = packageManager.executeCommand('yarn', ['why', 'webpack']);
+  const webpackVersion = detectWebpack(packageManager);
+  if (webpackVersion) {
+    if (webpackVersion <= 4) {
+      return CoreBuilder.Webpack4;
     }
-
-    // if the user has BOTH webpack 4 and 5 installed already, we'll pick the safest options (4)
-    if (out.includes('webpack@4') || out.includes('webpack@npm:4')) {
+    if (webpackVersion >= 5) {
       return CoreBuilder.Webpack5;
     }
+  }
 
-    // the user has webpack 4 installed, but not 5
-    if (out.includes('webpack@5') || out.includes('webpack@npm:5')) {
+  const nextJSVersion = detectNextJS(packageManager);
+  if (nextJSVersion) {
+    if (nextJSVersion >= 11) {
       return CoreBuilder.Webpack5;
     }
-  } catch (err) {
-    //
   }
 
   // Fallback to webpack4