fix: npm install with npm 7

.eslintrc.json

@@ -1,5 +1,5 @@
 {
-  "extends": "vaadin",
+  "extends": "eslint:recommended",
   "env": {
     "browser": true,
     "node": true,
@@ -15,6 +15,59 @@
   "parserOptions": {
     "sourceType": "module"
   },
+  "rules": {
+    "curly": 2,
+    "no-caller": 2,
+    "no-extend-native": 2,
+    "no-extra-bind": 2,
+    "no-invalid-this": 2,
+    "no-multi-spaces": 2,
+    "no-new-wrappers": 2,
+    "no-with": 2,
+    "array-bracket-spacing": [2, "never"],
+    "brace-style": 2,
+
+    "camelcase": [2, {"properties": "never"}],
+    "comma-spacing": 2,
+    "comma-style": 2,
+    "computed-property-spacing": 2,
+    "func-call-spacing": 2,
+    "indent": [2, 2, {"SwitchCase": 1}],
+    "key-spacing": 2,
+    "keyword-spacing": 2,
+    "linebreak-style": 2,
+    "max-len": [2, {"code": 140}],
+    "no-array-constructor": 2,
+    "no-multiple-empty-lines": [2, {"max": 2}],
+    "no-new-object": 2,
+    "no-trailing-spaces": 2,
+    "object-curly-spacing": 2,
+    "quote-props": [2, "consistent"],
+    "quotes": [2, "single", {"allowTemplateLiterals": true}],
+    "semi-spacing": 2,
+    "semi": 2,
+    "space-before-blocks": 2,
+    "space-before-function-paren": [2, "never"],
+    "space-in-parens": 2,
+    "space-infix-ops": 2,
+    "spaced-comment": [2, "always"],
+
+    "arrow-spacing": 2,
+    "constructor-super": 2,
+    "no-confusing-arrow": 2,
+    "no-const-assign": 2,
+    "no-dupe-class-members": 2,
+    "no-duplicate-imports": 2,
+    "no-this-before-super": 2,
+    "no-useless-computed-key": 2,
+    "no-useless-constructor": 2,
+    "no-useless-rename": 2,
+    "prefer-const": 2,
+    "rest-spread-spacing": 2,
+    "template-curly-spacing": 2,
+
+    "no-unused-vars": ["error", { "args": "none" }]
+  },
   "overrides": [{
     "files": ["gulpfile.js"],
     "parserOptions": {

.stylelintrc.json

@@ -0,0 +1,93 @@
+{
+  "rules": {
+    "at-rule-name-case": "lower",
+    "at-rule-name-space-after": "always-single-line",
+    "at-rule-semicolon-newline-after": "always",
+    "block-closing-brace-empty-line-before": "never",
+    "block-closing-brace-newline-after": "always",
+    "block-closing-brace-newline-before": "always-multi-line",
+    "block-closing-brace-space-before": "always-single-line",
+    "block-no-empty": true,
+    "block-opening-brace-newline-after": "always-multi-line",
+    "block-opening-brace-space-after": "always-single-line",
+    "block-opening-brace-space-before": "always",
+    "color-hex-length": "short",
+    "color-no-invalid-hex": true,
+    "comment-no-empty": true,
+    "comment-whitespace-inside": "always",
+    "custom-property-empty-line-before": "never",
+    "declaration-bang-space-after": "never",
+    "declaration-bang-space-before": "always",
+    "declaration-block-no-duplicate-properties": [ true, {
+      "ignore": ["consecutive-duplicates-with-different-values"]
+    } ],
+    "declaration-block-no-redundant-longhand-properties": true,
+    "declaration-block-no-shorthand-property-overrides": true,
+    "declaration-block-semicolon-newline-after": "always-multi-line",
+    "declaration-block-semicolon-space-after": "always-single-line",
+    "declaration-block-semicolon-space-before": "never",
+    "declaration-block-single-line-max-declarations": 1,
+    "declaration-block-trailing-semicolon": "always",
+    "declaration-colon-newline-after": "always-multi-line",
+    "declaration-colon-space-after": "always-single-line",
+    "declaration-colon-space-before": "never",
+    "font-family-no-duplicate-names": true,
+    "function-calc-no-unspaced-operator": true,
+    "function-comma-newline-after": "always-multi-line",
+    "function-comma-space-after": "always-single-line",
+    "function-comma-space-before": "never",
+    "function-linear-gradient-no-nonstandard-direction": true,
+    "function-max-empty-lines": 0,
+    "function-name-case": "lower",
+    "function-parentheses-newline-inside": "always-multi-line",
+    "function-parentheses-space-inside": "never-single-line",
+    "function-whitespace-after": "always",
+    "indentation": null,
+    "keyframe-declaration-no-important": true,
+    "length-zero-no-unit": true,
+    "max-empty-lines": 1,
+    "media-feature-colon-space-after": "always",
+    "media-feature-colon-space-before": "never",
+    "media-feature-name-case": "lower",
+    "media-feature-name-no-unknown": true,
+    "media-feature-parentheses-space-inside": "never",
+    "media-feature-range-operator-space-after": "always",
+    "media-feature-range-operator-space-before": "always",
+    "media-query-list-comma-newline-after": "always-multi-line",
+    "media-query-list-comma-space-after": "always-single-line",
+    "media-query-list-comma-space-before": "never",
+    "no-eol-whitespace": true,
+    "no-invalid-double-slash-comments": true,
+    "number-no-trailing-zeros": true,
+    "property-case": "lower",
+    "property-no-unknown": true,
+    "rule-empty-line-before": [ "always-multi-line", {
+      "except": ["first-nested"],
+      "ignore": ["after-comment"]
+    } ],
+    "selector-attribute-brackets-space-inside": "never",
+    "selector-attribute-operator-space-after": "never",
+    "selector-attribute-operator-space-before": "never",
+    "selector-combinator-space-after": "always",
+    "selector-combinator-space-before": "always",
+    "selector-descendant-combinator-no-non-space": true,
+    "selector-list-comma-newline-after": "always",
+    "selector-list-comma-space-before": "never",
+    "selector-max-empty-lines": 0,
+    "selector-pseudo-class-case": "lower",
+    "selector-pseudo-class-no-unknown": true,
+    "selector-pseudo-class-parentheses-space-inside": "never",
+    "selector-pseudo-element-case": "lower",
+    "selector-pseudo-element-colon-notation": "double",
+    "selector-pseudo-element-no-unknown": true,
+    "selector-type-case": "lower",
+    "shorthand-property-no-redundant-values": true,
+    "string-no-newline": true,
+    "unit-case": "lower",
+    "unit-no-unknown": true,
+    "value-list-comma-newline-after": "always-multi-line",
+    "value-list-comma-space-after": "always-single-line",
+    "value-list-comma-space-before": "never",
+    "value-list-max-empty-lines": 0
+  }
+}

demo/element-demo.html

@@ -1,4 +1,5 @@
 <script>
+  /* eslint-disable no-global-assign */
   /* @polymerMixin */
   ElementDemo = superClass => {
     return class extends superClass {

package.json

@@ -79,7 +79,6 @@
     "browserslist": "^4.16.3",
     "bundlesize": "^0.18.1",
     "eslint": "^7.22.0",
-    "eslint-config-vaadin": "0.2.7",
     "eslint-plugin-html": "^6.1.2",
     "fs-extra": "^9.0.1",
     "gulp": "^4.0.2",
@@ -91,7 +90,6 @@
     "polyserve": "^0.27.15",
     "rollup": "^2.35.1",
     "stylelint": "^13.12.0",
-    "stylelint-config-vaadin": "0.1.4",
     "typescript": "^4.1.5",
     "uglify-es": "^3.3.9",
     "wct-istanbul": "^0.14.3",

src/resolver/resolver.js

@@ -222,7 +222,7 @@ class Resolver {
       ? this.constructor.__createUrl(
         this.baseUrl,
         document.baseURI || document.URL
-      ).href.replace(/[^\/]*$/, '')
+      ).href.replace(/[^/]*$/, '')
       : '';
   }
 

src/router.js

@@ -172,7 +172,7 @@ export class Router extends Resolver {
     const baseHref = baseElement && baseElement.getAttribute('href');
     super([], Object.assign({
       // Default options
-      baseUrl: baseHref && Resolver.__createUrl(baseHref, document.URL).href.replace(/[^\/]*$/, '')
+      baseUrl: baseHref && Resolver.__createUrl(baseHref, document.URL).href.replace(/[^/]*$/, '')
     }, options));
 
     this.resolveRoute = context => this.__resolveRoute(context);