diff --git a/.editorconfig b/.editorconfig
index 0e00241..a6efbd9 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -10,6 +10,7 @@ indent_size = 2
 indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
+max_line_length = 120
 
 [*.md]
 max_line_length = off
diff --git a/packages/browserslist-config/package.json b/packages/browserslist-config/package.json
index 1aed7bf..95fe83e 100644
--- a/packages/browserslist-config/package.json
+++ b/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"
diff --git a/packages/browserslist-config/scripts/postinstall.js b/packages/browserslist-config/scripts/postinstall.js
index c3f9887..0682f7d 100644
--- a/packages/browserslist-config/scripts/postinstall.js
+++ b/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)) {
diff --git a/packages/browserslist-config/yarn.lock b/packages/browserslist-config/yarn.lock
index 7d3a6e7..f2b3188 100644
--- a/packages/browserslist-config/yarn.lock
+++ b/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"
diff --git a/packages/commitlint-config/package.json b/packages/commitlint-config/package.json
index bc5896c..653a8b3 100644
--- a/packages/commitlint-config/package.json
+++ b/packages/commitlint-config/package.json
@@ -36,7 +36,8 @@
   },
   "dependencies": {
     "@commitlint/cli": "18.0.0",
-    "@commitlint/config-conventional": "18.0.0"
+    "@commitlint/config-conventional": "18.0.0",
+    "@ivuorinen/config-checker": "^1.1.0"
   },
   "gitHead": "23d15f15743fb59c1dbe658615ef2ed51c54d230"
 }
diff --git a/packages/commitlint-config/scripts/postinstall.js b/packages/commitlint-config/scripts/postinstall.js
index eb60409..288c779 100644
--- a/packages/commitlint-config/scripts/postinstall.js
+++ b/packages/commitlint-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('commitlint')
+
+if (foundConfig.length > 0) {
+  console.log('commitlint-config: Found existing commitlint config file, skipping creation.')
+  console.log('commitlint-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`commitlint-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.commitlintrc.json')
-
 const fileConfigObject = {
   extends: ['@ivuorinen/commitlint-config']
 }
diff --git a/packages/commitlint-config/yarn.lock b/packages/commitlint-config/yarn.lock
index 9708c4c..3f36b6a 100644
--- a/packages/commitlint-config/yarn.lock
+++ b/packages/commitlint-config/yarn.lock
@@ -192,6 +192,11 @@
   dependencies:
     "@jridgewell/trace-mapping" "0.3.9"
 
+"@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==
+
 "@jridgewell/resolve-uri@^3.0.3":
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/@jridgewell/resolve-uri/-/resolve-uri-3.1.1.tgz#c08679063f279615a3326583ba3a90d1d82cc721"
diff --git a/packages/eslint-config/package.json b/packages/eslint-config/package.json
index 34f86e2..1a45fa8 100644
--- a/packages/eslint-config/package.json
+++ b/packages/eslint-config/package.json
@@ -36,6 +36,7 @@
     "postinstall": "node scripts/postinstall.js"
   },
   "dependencies": {
+    "@ivuorinen/config-checker": "^1.1.0",
     "eslint": "8.52.0",
     "eslint-config-standard": "17.1.0",
     "eslint-plugin-import": "2.28.1",
diff --git a/packages/eslint-config/scripts/postinstall.js b/packages/eslint-config/scripts/postinstall.js
index f0e4c72..abc3e24 100644
--- a/packages/eslint-config/scripts/postinstall.js
+++ b/packages/eslint-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('eslint')
+
+if (foundConfig.length > 0) {
+  console.log('eslint-config: Found existing eslint config file, skipping creation.')
+  console.log('eslint-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`eslint-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.eslintrc.json')
-
 const fileConfigObject = {
   extends: ['@ivuorinen']
 }
diff --git a/packages/eslint-config/yarn.lock b/packages/eslint-config/yarn.lock
index fd4eabe..d4b2c1a 100644
--- a/packages/eslint-config/yarn.lock
+++ b/packages/eslint-config/yarn.lock
@@ -58,6 +58,11 @@
   resolved "https://registry.yarnpkg.com/@humanwhocodes/object-schema/-/object-schema-2.0.1.tgz#e5211452df060fa8522b55c7b3c0c4d1981cb044"
   integrity sha512-dvuCeX5fC9dXgJn9t+X5atfmgQAzUOWqS1254Gh0m6i8wKd10ebXkfNKiRK+1GWi/yTvvLDHpoxLr0xxxeslWw==
 
+"@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==
+
 "@nodelib/fs.scandir@2.1.5":
   version "2.1.5"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5"
diff --git a/packages/markdownlint-config/package.json b/packages/markdownlint-config/package.json
index 74b9bbd..6c5d601 100644
--- a/packages/markdownlint-config/package.json
+++ b/packages/markdownlint-config/package.json
@@ -36,6 +36,7 @@
     "postinstall": "node scripts/postinstall.js"
   },
   "dependencies": {
+    "@ivuorinen/config-checker": "^1.1.0",
     "markdownlint-cli": "0.37.0"
   },
   "gitHead": "23d15f15743fb59c1dbe658615ef2ed51c54d230"
diff --git a/packages/markdownlint-config/scripts/postinstall.js b/packages/markdownlint-config/scripts/postinstall.js
index 3d21851..aded3b8 100644
--- a/packages/markdownlint-config/scripts/postinstall.js
+++ b/packages/markdownlint-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('markdownlint')
+
+if (foundConfig.length > 0) {
+  console.log('markdownlint-config: Found existing markdownlint config file, skipping creation.')
+  console.log('markdownlint-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`markdownlint-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.markdownlint.json')
-
 const fileConfigObject = {
   extends: '@ivuorinen/markdownlint-config'
 }
diff --git a/packages/markdownlint-config/yarn.lock b/packages/markdownlint-config/yarn.lock
index 9f96e76..66dfa83 100644
--- a/packages/markdownlint-config/yarn.lock
+++ b/packages/markdownlint-config/yarn.lock
@@ -14,6 +14,11 @@
     wrap-ansi "^8.1.0"
     wrap-ansi-cjs "npm:wrap-ansi@^7.0.0"
 
+"@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==
+
 "@pkgjs/parseargs@^0.11.0":
   version "0.11.0"
   resolved "https://registry.yarnpkg.com/@pkgjs/parseargs/-/parseargs-0.11.0.tgz#a77ea742fab25775145434eb1d2328cf5013ac33"
diff --git a/packages/prettier-config/package.json b/packages/prettier-config/package.json
index 81ae2ba..3e623fd 100644
--- a/packages/prettier-config/package.json
+++ b/packages/prettier-config/package.json
@@ -36,6 +36,7 @@
     "postinstall": "node scripts/postinstall.js"
   },
   "dependencies": {
+    "@ivuorinen/config-checker": "^1.1.0",
     "prettier": "2.8.8"
   },
   "gitHead": "23d15f15743fb59c1dbe658615ef2ed51c54d230"
diff --git a/packages/prettier-config/scripts/postinstall.js b/packages/prettier-config/scripts/postinstall.js
index 9468418..f12c9fe 100644
--- a/packages/prettier-config/scripts/postinstall.js
+++ b/packages/prettier-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('prettier')
+
+if (foundConfig.length > 0) {
+  console.log('prettier-config: Found existing prettier config file, skipping creation.')
+  console.log('prettier-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`prettier-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.prettierrc.json')
-
 const fileConfigObject = '@ivuorinen/prettier-config'
 
 if (!fs.existsSync(filePath)) {
diff --git a/packages/prettier-config/yarn.lock b/packages/prettier-config/yarn.lock
index 7c65ca6..dcb5736 100644
--- a/packages/prettier-config/yarn.lock
+++ b/packages/prettier-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==
+
 prettier@2.8.8:
   version "2.8.8"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
diff --git a/packages/semantic-release-config/package.json b/packages/semantic-release-config/package.json
index ba2b714..324d073 100644
--- a/packages/semantic-release-config/package.json
+++ b/packages/semantic-release-config/package.json
@@ -36,6 +36,7 @@
     "postinstall": "node scripts/postinstall.js"
   },
   "dependencies": {
+    "@ivuorinen/config-checker": "^1.1.0",
     "@semantic-release/changelog": "6.0.3",
     "@semantic-release/git": "10.0.1",
     "semantic-release": "22.0.5"
diff --git a/packages/semantic-release-config/scripts/postinstall.js b/packages/semantic-release-config/scripts/postinstall.js
index f2b122d..a1b2347 100644
--- a/packages/semantic-release-config/scripts/postinstall.js
+++ b/packages/semantic-release-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('release')
+
+if (foundConfig.length > 0) {
+  console.log('semantic-release-config: Found existing semantic-release config file, skipping creation.')
+  console.log('semantic-release-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`semantic-release-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.releaserc.json')
-
 const fileConfigObject = {
   extends: ['@ivuorinen/semantic-release-config']
 }
diff --git a/packages/semantic-release-config/yarn.lock b/packages/semantic-release-config/yarn.lock
index 57eca8e..832f5d7 100644
--- a/packages/semantic-release-config/yarn.lock
+++ b/packages/semantic-release-config/yarn.lock
@@ -46,6 +46,11 @@
   resolved "https://registry.yarnpkg.com/@isaacs/string-locale-compare/-/string-locale-compare-1.1.0.tgz#291c227e93fd407a96ecd59879a35809120e432b"
   integrity sha512-SQ7Kzhh9+D+ZW9MA0zkYv3VXhIDNx+LzM6EJ+/65I3QY+enU6Itte7E5XX7EWrqLW2FN4n06GWzBnPoC3th2aQ==
 
+"@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==
+
 "@nodelib/fs.scandir@2.1.5":
   version "2.1.5"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5"
diff --git a/packages/stylelint-config/package.json b/packages/stylelint-config/package.json
index fb1008f..b596484 100644
--- a/packages/stylelint-config/package.json
+++ b/packages/stylelint-config/package.json
@@ -37,6 +37,7 @@
     "postinstall": "node scripts/postinstall.js"
   },
   "dependencies": {
+    "@ivuorinen/config-checker": "^1.1.0",
     "postcss": "^8.4.2",
     "stylelint": "15.11.0",
     "stylelint-config-recommended-scss": "13.0.0",
diff --git a/packages/stylelint-config/scripts/postinstall.js b/packages/stylelint-config/scripts/postinstall.js
index 48ff2a8..cc36559 100644
--- a/packages/stylelint-config/scripts/postinstall.js
+++ b/packages/stylelint-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('stylelint')
+
+if (foundConfig.length > 0) {
+  console.log('stylelint-config: Found existing stylelint config file, skipping creation.')
+  console.log('stylelint-config: If you want to create a new config file, please remove the existing one.')
+  console.log(`stylelint-config: Found config files at: ${foundConfig.join(', ')}`)
+  process.exit(0)
+}
 
 const filePath = path.join(process.env.INIT_CWD, '.stylelintrc.json')
-
 const fileConfigObject = {
   extends: ['@ivuorinen/stylelint-config/css']
 }
diff --git a/packages/stylelint-config/yarn.lock b/packages/stylelint-config/yarn.lock
index f43a774..97b7fe1 100644
--- a/packages/stylelint-config/yarn.lock
+++ b/packages/stylelint-config/yarn.lock
@@ -44,6 +44,11 @@
   resolved "https://registry.yarnpkg.com/@csstools/selector-specificity/-/selector-specificity-3.0.0.tgz#798622546b63847e82389e473fd67f2707d82247"
   integrity sha512-hBI9tfBtuPIi885ZsZ32IMEU/5nlZH/KOVYJCOh7gyMxaVLGmLedYqFN6Ui1LXkI8JlC8IsuC0rF0btcRZKd5g==
 
+"@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==
+
 "@nodelib/fs.scandir@2.1.5":
   version "2.1.5"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5"