Defaults

.eslintrc

@@ -0,0 +1,20 @@
+{
+  "extends": [
+    "prettier"
+  ],
+  "plugins": [
+    "prettier",
+    "babel"
+  ],
+  "parser": "babel-eslint",
+  "rules": {
+    "prettier/prettier": [
+      1,
+      {
+        "semi": false,
+        "singleQuote": true,
+        "trailingComma": "all"
+      }
+    ]
+  }
+}

index.js

@@ -2,27 +2,13 @@
 
 let { exec } = require('child_process')
 let { promisify } = require('util')
-let fs = require('fs')
+let fs = require('fs-extra')
+let path = require('path')
+let ask = require('inquirer')
 
 exec = promisify(exec)
 
-let config = `
-module.exports = {
-  extends: ['prettier'],
-  plugins: ['prettier', 'babel'],
-  parser: 'babel-eslint',
-  rules: {
-    'prettier/prettier': [
-      1,
-      {
-        semi: false,
-        singleQuote: true,
-        trailingComma: 'all',
-      },
-    ],
-  },
-}
-`.trim()
+let config = fs.readJsonSync(path.join(__dirname, '.eslintrc'))
 
 let deps = [
   'babel-eslint',
@@ -33,14 +19,28 @@ let deps = [
   'prettier',
 ].join(' ')
 
-console.log('creating .eslintrc.js')
-
-fs.writeFile('.eslintrc.js', config, async () => {
-  console.log('Installing prettier & eslint modules')
-  if (fs.existsSync('yarn.lock')) {
-    await exec(`yarn add -D ${deps}`)
-  } else {
-    await exec(`npm i --dev ${deps}`)
-  }
-  console.log(`🎉 prettier and eslint configured!`)
-})
+console.log('writing config to package.json')
+
+const pkgPath = path.join(process.cwd(), 'package.json')
+const pkg = require(pkgPath)
+pkg.eslint = config
+;(async function() {
+  const { extend } = await ask.prompt({
+    name: 'extend',
+    type: 'confirm',
+    message: 'Would you like to extend from eslint:recommended?',
+    default: true,
+  })
+
+  if (extend) pkg.eslint.extends = 'eslint:recommended'
+
+  fs.writeJson(pkgPath, pkg, { spaces: 2 }, async () => {
+    console.log('Installing prettier & eslint modules')
+    if (fs.existsSync('yarn.lock')) {
+      await exec(`yarn add -D ${deps}`)
+    } else {
+      await exec(`npm i --dev ${deps}`)
+    }
+    console.log(`🎉 prettier and eslint configured!`)
+  })
+})()

package.json

@@ -21,6 +21,8 @@
     "eslint-config-prettier": "^3.3.0",
     "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-prettier": "^3.0.0",
+    "fs-extra": "^7.0.1",
+    "inquirer": "^6.2.1",
     "prettier": "^1.15.3"
   }
 }