tools: Add run-eslint.sh script

The script is a small wrapper around the `ci-run-eslint` package
from World/javascript, which is a generalized and improved version
of the .gitlab-ci/run-eslint script from gnome-shell.

It only requires `npm` to be available, so it simplifies running
eslint locally quite a lot

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/408>

.gitattributes

@@ -0,0 +1,4 @@
+# SPDX-FileCopyrightText: No rights reserved
+# SPDX-License-Identifier: CC0-1.0
+
+package-lock.json -diff

.gitignore

@@ -9,4 +9,6 @@ zip-files/
 *.patch
 *.sw?
 .buildconfig
+.eslintcache
 .vscode
+node_modules

REUSE.toml

@@ -29,3 +29,13 @@ SPDX-License-Identifier = "GPL-2.0-or-later"
 path = ["po/LINGUAS", "po/POTFILES.in"]
 SPDX-FileCopyrightText = "No rights reserved"
 SPDX-License-Identifier = "CC0-1.0"
+
+[[annotations]]
+path = "tools/package.json"
+SPDX-FileCopyrightText = "2025 Florian Müllner <fmuellner@gnome.org>"
+SPDX-License-Identifier = "MIT OR LGPL-2.0-or-later"
+
+[[annotations]]
+path = "**package-lock.json"
+SPDX-FileCopyrightText = "No rights reserved"
+SPDX-License-Identifier = "CC0-1.0"

tools/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "gnome-shell-extensions-dev-scripts",
+  "version": "1.0.0",
+  "license": "MIT OR LGPL-2.0-or-later",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "lint": "cd .. && ci-run-eslint"
+  },
+  "dependencies": {
+    "ci-run-eslint": "git+https://gitlab.gnome.org/World/javascript/ci-run-eslint.git",
+    "eslint-plugin-jsdoc": "^48.11.0"
+  }
+}

tools/run-eslint.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+# SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
+# SPDX-FileCopyrightText: 2020 Philip Chimento <philip.chimento@gmail.com>
+# SPDX-FileCopyrightText: 2025 Florian Müllner <fmuellner@gnome.org>
+
+cd $(dirname -- "$0")
+[ ! -d node_modules ] && npm clean-install
+npm run lint -- "$@"