enh: Add first version the shared prettier configuration

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

index.js

@@ -0,0 +1,8 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Ferdinand Thiessen <opensource@fthiessen.de>
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+import config from './prettier.config.js'
+
+export default config

package.json

@@ -2,13 +2,11 @@
   "name": "@nextcloud/prettier-config",
   "version": "1.0.0",
   "description": "Shared stylistic rules for Nextcloud apps and libraries",
-  "type": "module",
-  "main": "index.js",
-  "exports": {
-    "default": "./index.js"
-  },
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+  "author": "Ferdinand Thiessen",
+  "license": "BSD-3-Clause",
+  "homepage": "https://github.com/nextcloud-libraries/nextcloud-prettier-config#readme",
+  "bugs": {
+    "url": "https://github.com/nextcloud-libraries/nextcloud-prettier-config/issues"
   },
   "repository": {
     "type": "git",
@@ -18,10 +16,18 @@
     "Nextcloud",
     "prettier"
   ],
-  "author": "Ferdinand Thiessen",
-  "license": "BSD-3-Clause",
-  "bugs": {
-    "url": "https://github.com/nextcloud-libraries/nextcloud-prettier-config/issues"
+  "type": "module",
+  "main": "index.js",
+  "exports": {
+    "default": "./index.js"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "peerDependencies": {
+    "prettier": ">=3.0.0"
   },
-  "homepage": "https://github.com/nextcloud-libraries/nextcloud-prettier-config#readme"
+  "devDependencies": {
+    "prettier": "^3.2.4"
+  }
 }

prettier.config.js

@@ -0,0 +1,36 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Ferdinand Thiessen <opensource@fthiessen.de>
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/**
+ * @type {import("prettier").Config}
+ */
+export default {
+	// We always use tabs with 4 spaces tab width
+	useTabs: true,
+	tabWidth: 4,
+	// Allow brackets to be on the same line, required for Vue
+	bracketSameLine: true,
+	// Never enforce semicolons if not required
+	semi: false,
+	// Always use single quote over double quote (' instead of ")
+	singleQuote: true,
+	// Enforce parenthesis for arrow functions
+	arrowParens: 'always',
+	// Always enfore a trailing comma
+	trailingComma: 'all',
+	// This is not a hard limit! We need 90 to keep changes from ESLint migration small
+	printWidth: 90,
+
+	overrides: [
+		// For package.json we need other indention as Node decided to only support spaces, so otherwise it would be reformatted on every npm install
+		{
+			files: ['package.json', 'package-lock.json'],
+			options: {
+				tabWidth: 2,
+				useTabs: false,
+			},
+		},
+	],
+}