feat: skip config creation if one already found (#110)

This commit introduces mechanism that'll check for common configuration file locations and respects the original file.

packages/browserslist-config/package.json

@@ -36,6 +36,7 @@
     "postinstall": "node scripts/postinstall.js"
   },
   "dependencies": {
+    "@ivuorinen/config-checker": "^1.1.0",
     "browserslist": "4.22.1"
   },
   "gitHead": "23d15f15743fb59c1dbe658615ef2ed51c54d230"

packages/browserslist-config/scripts/postinstall.js

@@ -2,9 +2,18 @@
 
 const fs = require('fs')
 const path = require('path')
+const process = require('process')
+const checkConfig = require('@ivuorinen/config-checker')
+const foundConfig = checkConfig('browserslist')
+
+if (foundConfig.length > 0) {
+  console.log('browserslist-config: Found existing browserslist config file, skipping creation.')
+  console.log('browserslist-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`browserslist-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.browserslistrc')
-
 const fileConfigObject = 'extends @ivuorinen/browserslist-config'
 
 if (!fs.existsSync(filePath)) {

packages/browserslist-config/yarn.lock

@@ -2,6 +2,11 @@
 # yarn lockfile v1
 
 
+"@ivuorinen/config-checker@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@ivuorinen/config-checker/-/config-checker-1.1.0.tgz#73a996445a917627cb558ea69f616978ff97da9d"
+  integrity sha512-YHQSF2yt4YZM0W9jdFXdPUB4X1AicweDJWSJtFw58GVI4+wI8+CJtoKL/Dmbn8F3B6H6gngQHwzENqw80Zsskg==
+
 browserslist@4.22.1:
   version "4.22.1"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.22.1.tgz#ba91958d1a59b87dab6fed8dfbcb3da5e2e9c619"