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:
@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ['3.8', '3.12']
         database: [postgresql]
 
     steps:
@@ -53,10 +53,11 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-        python-version: "3.11"
+          python-version: '3.11'
       - name: Install dependencies
         run: |
           python3 -m pip install -e .[test,dev]
+          make installjs
 
       - name: Run Lint
         run: make lint
@@ -71,7 +72,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-        python-version: "3.11"
+          python-version: '3.11'
       - name: Install dependencies
         run: |
           python3 -m pip install -r docs/requirements.txt

Makefile

@@ -20,6 +20,7 @@ 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/ &&\

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,