feat(create-eslint-config): extend existing config

package.json

@@ -12,6 +12,7 @@
     }
   },
   "devDependencies": {
+    "@babel/types": "^7.25.0",
     "@commitlint/cli": "^20.5.0",
     "@commitlint/config-conventional": "^20.5.0",
     "@commitlint/config-nx-scopes": "^20.5.0",
@@ -59,6 +60,7 @@
     "jsonc-eslint-parser": "^3.1.0",
     "nx": "22.6.4",
     "prettier": "~3.6.2",
+    "recast": "^0.23.11",
     "semver": "^7.7.4",
     "tslib": "^2.3.0",
     "typescript": "^5.6.3",

packages/create-eslint-config/package.json

@@ -26,8 +26,18 @@
   },
   "homepage": "https://github.com/code-pushup/eslint-config/tree/main/packages/create-eslint-config#readme",
   "dependencies": {
+    "@babel/types": "^7.25.0",
     "@inquirer/prompts": "^8.4.1",
+    "recast": "^0.23.11",
     "semver": "^7.7.4",
     "yargs": "^18.0.0"
+  },
+  "peerDependencies": {
+    "prettier": "^3.0.0"
+  },
+  "peerDependenciesMeta": {
+    "prettier": {
+      "optional": true
+    }
   }
 }

packages/create-eslint-config/src/cli.ts

@@ -1,12 +1,10 @@
-import path from 'node:path';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
 import { logError, formatError, logChanges, logInfo } from './lib/output.js';
 import {
   detectPackageManager,
   installDependencies,
 } from './lib/package-manager.js';
-import { validateConfigSlugs } from './lib/prompts.js';
 import { NODE_VERSION_SOURCES } from './lib/types.js';
 import { runSetupWizard } from './lib/wizard.js';
 
@@ -42,12 +40,6 @@ const argv = await yargs(hideBin(process.argv))
     default: false,
     describe: 'Show what would happen without writing or installing',
   })
-  .check(parsed => {
-    if (parsed.configs) {
-      validateConfigSlugs(parsed.configs);
-    }
-    return true;
-  })
   .strict()
   .help()
   .version()
@@ -68,7 +60,7 @@ try {
   logChanges(result.files);
 
   if (argv.dryRun) {
-    logInfo('Dry run — no files written.');
+    logInfo('Dry run. No files written.');
   } else {
     await result.flush();
     const manager = await detectPackageManager(targetDir);
@@ -83,21 +75,10 @@ try {
       process.exitCode = 1;
     }
   }
-
-  // TODO: remove snippet output once the wizard can merge into existing configs
-  if (result.manualSnippet) {
-    const filename = result.manualSnippetPath
-      ? path.basename(result.manualSnippetPath)
-      : 'eslint.config.js';
-    logInfo(
-      `Existing ${filename} detected. Here are the imports and config entries for your selections — merge manually (v1 will do this automatically):`,
-      '',
-      result.manualSnippet,
-    );
-  } else if (!argv.dryRun && !process.exitCode) {
+  if (!argv.dryRun && !process.exitCode) {
     logInfo('Next step: run `npx eslint .` to verify the setup.');
   }
 } catch (error) {
-  logError(formatError(error));
+  logError('Setup wizard failed.', formatError(error));
   process.exitCode = 1;
 }

packages/create-eslint-config/src/index.ts

@@ -1,7 +1,9 @@
 export { runSetupWizard } from './lib/wizard.js';
-export type {
-  FileChange,
-  NodeVersionSource,
-  WizardOptions,
-  WizardResult,
+export { WizardError } from './lib/errors.js';
+export {
+  NODE_VERSION_SOURCES,
+  type FileChange,
+  type NodeVersionSource,
+  type WizardOptions,
+  type WizardResult,
 } from './lib/types.js';