lint: use eslint with a browserslist configuration

.eslintrc.json

@@ -0,0 +1,11 @@
+{
+  "plugins": ["compat"],
+  "extends": ["plugin:compat/recommended"],
+  "env": {
+    "es6": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  }
+}

.github/workflows/test-docs.yml

@@ -2,9 +2,9 @@ name: Test & Docs
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 jobs:
   tests:
@@ -24,57 +24,58 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ['3.8', '3.12']
         database: [postgresql]
 
     steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
-      with:
-        python-version: ${{ matrix.python-version }}
-        cache: 'pip'
-        cache-dependency-path: '**/pyproject.toml'
-    - name: Install dependencies
-      run: |
-        sudo apt update
-        sudo apt install libgdal-dev
-        python -m pip install --upgrade pip
-        make develop installjs vendors
-    - name: run tests
-      run: make test
-      env:
-        DJANGO_SETTINGS_MODULE: 'umap.tests.settings'
-        UMAP_SETTINGS: 'umap/tests/settings.py'
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          cache-dependency-path: '**/pyproject.toml'
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt install libgdal-dev
+          python -m pip install --upgrade pip
+          make develop installjs vendors
+      - name: run tests
+        run: make test
+        env:
+          DJANGO_SETTINGS_MODULE: 'umap.tests.settings'
+          UMAP_SETTINGS: 'umap/tests/settings.py'
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python
-      uses: actions/setup-python@v4
-      with:
-        python-version: "3.11"
-    - name: Install dependencies
-      run: |
-        python3 -m pip install -e .[test,dev]
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+      - name: Install dependencies
+        run: |
+          python3 -m pip install -e .[test,dev]
+          make installjs
 
-    - name: Run Lint
-      run: make lint
-      
-    - name: Run Docs
-      run: make docs
+      - name: Run Lint
+        run: make lint
+
+      - name: Run Docs
+        run: make docs
 
   docs:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python
-      uses: actions/setup-python@v4
-      with:
-        python-version: "3.11"
-    - name: Install dependencies
-      run: |
-        python3 -m pip install -r docs/requirements.txt
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+      - name: Install dependencies
+        run: |
+          python3 -m pip install -r docs/requirements.txt
 
-    - name: Run Docs
-      run: mkdocs build
+      - name: Run Docs
+        run: mkdocs build

Makefile

@@ -20,9 +20,10 @@ format: ## Format the code and templates files
 
 .PHONY: lint
 lint: ## Lint the code and template files
+	npx eslint umap/static/umap/ &&\
 	djlint umap/templates --lint &&\
 	isort --check --profile black umap/ &&\
-    ruff format --check --target-version=py38 umap/ &&\
+	ruff format --check --target-version=py38 umap/ &&\
 	vermin --no-tips --violations -t=3.8- umap/
 
 docs: ## Compile the docs

package.json

@@ -7,6 +7,8 @@
   },
   "devDependencies": {
     "chai": "^3.3.0",
+    "eslint": "^8.56.0",
+    "eslint-plugin-compat": "^4.2.0",
     "happen": "~0.1.3",
     "lebab": "^3.2.1",
     "mocha": "^10.2.0",
@@ -60,5 +62,8 @@
     "simple-statistics": "^7.8.3",
     "togpx": "^0.5.4",
     "tokml": "0.4.0"
-  }
+  },
+  "browserslist": [
+    "> 0.5%, last 2 versions, Firefox ESR, not dead, not op_mini all"
+  ]
 }

umap/static/umap/js/umap.core.js

@@ -548,6 +548,7 @@ L.U.Help = L.Class.extend({
     label.title = label.textContent = L._('Close')
     this.content = L.DomUtil.create('div', 'umap-help-content', this.box)
     this.isMacOS = /mac/i.test(
+      // eslint-disable-next-line compat/compat -- Fallback available.
       navigator.userAgentData ? navigator.userAgentData.platform : navigator.platform
     )
   },

umap/static/umap/test/.eslintrc

@@ -7,7 +7,6 @@
         "after": true,
         "it": true,
         "sinon": true,
-        "qs": true,
         "enableEdit": true,
         "disableEdit": true,
         "changeInputValue": true,