Activate linting for frontend files

.eslintrc.js

+module.exports = {
+  extends: [
+    "eslint:recommended",
+    "plugin:vue/strongly-recommended",
+    //    "plugin:prettier/recommended",
+    "plugin:@intlify/vue-i18n/recommended",
+  ],
+  rules: {
+    "no-unused-vars": "warn",
+    "vue/no-unused-vars": "off",
+    "vue/multi-word-component-names": "off",
+    "@intlify/vue-i18n/key-format-style": [
+      "error",
+      "snake_case",
+      {
+        splitByDots: false,
+      },
+    ],
+    // "@intlify/vue-i18n/no-unused-keys": ["warn", {}],
+    "@intlify/vue-i18n/no-raw-text": [
+      "error",
+      {
+        ignoreNodes: ["v-icon"],
+        ignorePattern: "^[-–—·#:()\\[\\]&\\.\\s]+$",
+      },
+    ],
+    // Fixes for prettier (avoid eslint-config-prettier)
+    // The following rules can be used in some cases. See the README for more
+    // information. (These are marked with `0` instead of `"off"` so that a
+    // script can distinguish them.)
+    curly: 0,
+    "lines-around-comment": 0,
+    "max-len": 0,
+    "no-confusing-arrow": 0,
+    "no-mixed-operators": 0,
+    "no-tabs": 0,
+    "no-unexpected-multiline": 0,
+    quotes: 0,
+    "@typescript-eslint/quotes": 0,
+    "babel/quotes": 0,
+    "vue/html-self-closing": 0,
+    "vue/max-len": 0,
+
+    // The rest are rules that you never need to enable when using Prettier.
+    "array-bracket-newline": "off",
+    "array-bracket-spacing": "off",
+    "array-element-newline": "off",
+    "arrow-parens": "off",
+    "arrow-spacing": "off",
+    "block-spacing": "off",
+    "brace-style": "off",
+    "comma-dangle": "off",
+    "comma-spacing": "off",
+    "comma-style": "off",
+    "computed-property-spacing": "off",
+    "dot-location": "off",
+    "eol-last": "off",
+    "func-call-spacing": "off",
+    "function-call-argument-newline": "off",
+    "function-paren-newline": "off",
+    "generator-star": "off",
+    "generator-star-spacing": "off",
+    "implicit-arrow-linebreak": "off",
+    indent: "off",
+    "jsx-quotes": "off",
+    "key-spacing": "off",
+    "keyword-spacing": "off",
+    "linebreak-style": "off",
+    "multiline-ternary": "off",
+    "newline-per-chained-call": "off",
+    "new-parens": "off",
+    "no-arrow-condition": "off",
+    "no-comma-dangle": "off",
+    "no-extra-parens": "off",
+    "no-extra-semi": "off",
+    "no-floating-decimal": "off",
+    "no-mixed-spaces-and-tabs": "off",
+    "no-multi-spaces": "off",
+    "no-multiple-empty-lines": "off",
+    "no-reserved-keys": "off",
+    "no-space-before-semi": "off",
+    "no-trailing-spaces": "off",
+    "no-whitespace-before-property": "off",
+    "no-wrap-func": "off",
+    "nonblock-statement-body-position": "off",
+    "object-curly-newline": "off",
+    "object-curly-spacing": "off",
+    "object-property-newline": "off",
+    "one-var-declaration-per-line": "off",
+    "operator-linebreak": "off",
+    "padded-blocks": "off",
+    "quote-props": "off",
+    "rest-spread-spacing": "off",
+    semi: "off",
+    "semi-spacing": "off",
+    "semi-style": "off",
+    "space-after-function-name": "off",
+    "space-after-keywords": "off",
+    "space-before-blocks": "off",
+    "space-before-function-paren": "off",
+    "space-before-function-parentheses": "off",
+    "space-before-keywords": "off",
+    "space-in-brackets": "off",
+    "space-in-parens": "off",
+    "space-infix-ops": "off",
+    "space-return-throw-case": "off",
+    "space-unary-ops": "off",
+    "space-unary-word-ops": "off",
+    "switch-colon-spacing": "off",
+    "template-curly-spacing": "off",
+    "template-tag-spacing": "off",
+    "unicode-bom": "off",
+    "wrap-iife": "off",
+    "wrap-regex": "off",
+    "yield-star-spacing": "off",
+    "@babel/object-curly-spacing": "off",
+    "@babel/semi": "off",
+    "@typescript-eslint/brace-style": "off",
+    "@typescript-eslint/comma-dangle": "off",
+    "@typescript-eslint/comma-spacing": "off",
+    "@typescript-eslint/func-call-spacing": "off",
+    "@typescript-eslint/indent": "off",
+    "@typescript-eslint/keyword-spacing": "off",
+    "@typescript-eslint/member-delimiter-style": "off",
+    "@typescript-eslint/no-extra-parens": "off",
+    "@typescript-eslint/no-extra-semi": "off",
+    "@typescript-eslint/object-curly-spacing": "off",
+    "@typescript-eslint/semi": "off",
+    "@typescript-eslint/space-before-blocks": "off",
+    "@typescript-eslint/space-before-function-paren": "off",
+    "@typescript-eslint/space-infix-ops": "off",
+    "@typescript-eslint/type-annotation-spacing": "off",
+    "babel/object-curly-spacing": "off",
+    "babel/semi": "off",
+    "flowtype/boolean-style": "off",
+    "flowtype/delimiter-dangle": "off",
+    "flowtype/generic-spacing": "off",
+    "flowtype/object-type-curly-spacing": "off",
+    "flowtype/object-type-delimiter": "off",
+    "flowtype/quotes": "off",
+    "flowtype/semi": "off",
+    "flowtype/space-after-type-colon": "off",
+    "flowtype/space-before-generic-bracket": "off",
+    "flowtype/space-before-type-colon": "off",
+    "flowtype/union-intersection-spacing": "off",
+    "react/jsx-child-element-spacing": "off",
+    "react/jsx-closing-bracket-location": "off",
+    "react/jsx-closing-tag-location": "off",
+    "react/jsx-curly-newline": "off",
+    "react/jsx-curly-spacing": "off",
+    "react/jsx-equals-spacing": "off",
+    "react/jsx-first-prop-new-line": "off",
+    "react/jsx-indent": "off",
+    "react/jsx-indent-props": "off",
+    "react/jsx-max-props-per-line": "off",
+    "react/jsx-newline": "off",
+    "react/jsx-one-expression-per-line": "off",
+    "react/jsx-props-no-multi-spaces": "off",
+    "react/jsx-tag-spacing": "off",
+    "react/jsx-wrap-multilines": "off",
+    "standard/array-bracket-even-spacing": "off",
+    "standard/computed-property-even-spacing": "off",
+    "standard/object-curly-even-spacing": "off",
+    "unicorn/empty-brace-spaces": "off",
+    "unicorn/no-nested-ternary": "off",
+    "unicorn/number-literal-case": "off",
+    "vue/array-bracket-newline": "off",
+    "vue/array-bracket-spacing": "off",
+    "vue/arrow-spacing": "off",
+    "vue/block-spacing": "off",
+    "vue/block-tag-newline": "off",
+    "vue/brace-style": "off",
+    "vue/comma-dangle": "off",
+    "vue/comma-spacing": "off",
+    "vue/comma-style": "off",
+    "vue/dot-location": "off",
+    "vue/func-call-spacing": "off",
+    "vue/html-closing-bracket-newline": "off",
+    "vue/html-closing-bracket-spacing": "off",
+    "vue/html-end-tags": "off",
+    "vue/html-indent": "off",
+    "vue/html-quotes": "off",
+    "vue/key-spacing": "off",
+    "vue/keyword-spacing": "off",
+    "vue/max-attributes-per-line": "off",
+    "vue/multiline-html-element-content-newline": "off",
+    "vue/multiline-ternary": "off",
+    "vue/mustache-interpolation-spacing": "off",
+    "vue/no-extra-parens": "off",
+    "vue/no-multi-spaces": "off",
+    "vue/no-spaces-around-equal-signs-in-attribute": "off",
+    "vue/object-curly-newline": "off",
+    "vue/object-curly-spacing": "off",
+    "vue/object-property-newline": "off",
+    "vue/operator-linebreak": "off",
+    "vue/quote-props": "off",
+    "vue/script-indent": "off",
+    "vue/singleline-html-element-content-newline": "off",
+    "vue/space-in-parens": "off",
+    "vue/space-infix-ops": "off",
+    "vue/space-unary-ops": "off",
+    "vue/template-curly-spacing": "off",
+  },
+  settings: {
+    "vue-i18n": {
+      localeDir: "./aleksis/core/frontend/messages/*.{json}",
+      messageSyntaxVersion: "^8.0.0",
+    },
+  },
+  env: {
+    es2021: true,
+  },
+  parserOptions: {
+    ecmaVersion: "latest",
+  },
+};

.prettierignore

+# Byte-compiled / optimized / DLL files
+*$py.class
+*.py[cod]
+__pycache__/
+
+# Distribution / packaging
+*.egg
+*.egg-info/
+.Python
+.eggs/
+.installed.cfg
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+
+# Installer logs
+pip-delete-this-directory.txt
+pip-log.txt
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# pyenv
+.python-version
+
+# Environments
+.env
+.venv
+ENV/
+env/
+venv/
+
+# Editors
+*~
+DEADJOE
+\#*#
+
+# IntelliJ
+.idea
+.idea/
+
+# Database
+db.sqlite3
+
+# Sphinx
+docs/_build/
+
+# TeX
+*.aux
+
+# Generated files
+/node_modules/
+/static/
+/whoosh_index/
+poetry.lock
+
+.coverage
+.mypy_cache/
+.tox/
+htmlcov/
+maintenance_mode_state.txt
+media/
+package-lock.json
+yarn.lock
+
+# VSCode
+.vscode/
+.history/
+*.code-workspace
+
+/cache
+
+# Add HTML files to avoid problems with unsupported Django templates
+*.html
+
+# Do not check/reformat generated files
+aleksis/core/util/licenses.json
+.vite/

tox.ini

 [tox]
 skipsdist = True
 skip_missing_interpreters = true
-envlist = py37,py38,py39
+envlist = py39,py310,py311
 
 [testenv]
 whitelist_externals = poetry
-		      sudo
 skip_install = true
 envdir = {toxworkdir}/globalenv
 commands_pre =
      poetry install
-     poetry run aleksis-admin yarn install
+     poetry run aleksis-admin vite build
      poetry run aleksis-admin collectstatic --no-input
 commands =
     poetry run pytest --cov=. {posargs} aleksis/
@@ -27,6 +26,8 @@ commands =
     poetry run black --check --diff aleksis/
     poetry run isort -c --diff --stdout aleksis/
     poetry run flake8 {posargs} aleksis/
+    poetry run sh -c "aleksis-admin yarn run prettier --check --ignore-path={toxinidir}/.prettierignore {toxinidir}"
+    poetry run sh -c "aleksis-admin yarn run eslint {toxinidir}/aleksis/**/*/frontend/**/*.{js,vue} --config={toxinidir}/.eslintrc.js --resolve-plugins-relative-to=."
 
 [testenv:security]
 commands =
@@ -46,6 +47,7 @@ commands = poetry run make -C docs/ html {posargs}
 commands =
     poetry run isort aleksis/
     poetry run black aleksis/
+    poetry run sh -c "aleksis-admin yarn run prettier --write --ignore-path={toxinidir}/.prettierignore {toxinidir}"
 
 [testenv:makemessages]
 commands =