Dependency updates + full ESM (#327)

* Dependency updates

* Fix eslint issues

* Switch to esm fully

* Fix Jest tests

* Update to node 16, force mini-css-extract-plugin to 1.x

* More dep updates

* Use correct NPM version in Actions

* Fix mini-css-extract-plugin version overrides

* Don't rely on Webpack for available languages

.eslintrc.cjs

@@ -0,0 +1,39 @@
+module.exports = {
+  env: {
+    'browser': true,
+    'node': true,
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:vue/recommended',
+  ],
+  parserOptions: {
+    parser: '@babel/eslint-parser',
+    ecmaVersion: 2018,
+    sourceType: 'module',
+    requireConfigFile: false,
+  },
+  rules: {
+    'linebreak-style': ['error', 'unix'],
+    semi: ['error', 'always'],
+    quotes: ['error', 'single'],
+    'comma-dangle': ['error', 'always-multiline'],
+    'vue/require-v-for-key': 0,
+    'vue/require-default-prop': 0,
+    'vue/no-v-html': 0,
+    'vue/max-attributes-per-line': 0,
+    'vue/html-indent': ['error', 4],
+    'vue/script-indent': ['error', 4, {
+      baseIndent: 1,
+    }],
+    'vue/no-unused-vars': 0,
+    'vue/html-self-closing': 0,
+    'vue/multi-word-component-names': 0,
+  },
+  globals: {
+    'describe': true,
+    'expect': true,
+    'it': true,
+    'test': true,
+  },
+};