chore: upgrade storybook

.storybook/config.js

@@ -1,4 +1,4 @@
-import { configure } from '@storybook/polymer';
+import { configure } from '@storybook/web-components';
 
 // automatically import all files ending in *.stories.ts
 const req = require.context('../src', true, /\.stories\.ts$/);

package.json

@@ -12,10 +12,9 @@
   ],
   "devDependencies": {
     "@babel/core": "^7.7.5",
-    "@storybook/addon-actions": "^5.2.8",
-    "@storybook/addon-knobs": "^5.2.8",
-    "@storybook/polymer": "^5.2.8",
-    "@types/storybook__polymer": "^5.1.0",
+    "@storybook/addon-actions": "^5.3.7",
+    "@storybook/addon-knobs": "^5.3.7",
+    "@storybook/web-components": "^5.3.7",
     "@typescript-eslint/eslint-plugin": "^2.10.0",
     "@typescript-eslint/parser": "^2.10.0",
     "awesome-typescript-loader": "^5.2.1",
@@ -26,7 +25,7 @@
     "eslint-plugin-prettier": "^3.1.1",
     "husky": "^3.1.0",
     "lint-staged": "^9.5.0",
-    "polymer-webpack-loader": "^2.0.3",
+    "patch-package": "^6.2.0",
     "prettier": "^1.19.1",
     "rimraf": "^3.0.0",
     "typescript": "^3.7.3"
@@ -38,6 +37,7 @@
     "build": "rimraf dist && tsc --sourceMap false && tsc -m esnext --outDir dist/esm --sourceMap false",
     "lint": "eslint src/**/*.ts",
     "prepare": "npm run build",
+    "postinstall": "patch-package",
     "storybook": "start-storybook -p 6006",
     "build-storybook": "build-storybook"
   },

patches/@storybook+web-components+5.3.7.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/@storybook/web-components/dist/client/preview/types.d.ts b/node_modules/@storybook/web-components/dist/client/preview/types.d.ts
+index 030d480..48a9e00 100644
+--- a/node_modules/@storybook/web-components/dist/client/preview/types.d.ts
++++ b/node_modules/@storybook/web-components/dist/client/preview/types.d.ts
+@@ -1,5 +1,7 @@
+ import { StoryFn } from '@storybook/addons';
+-export declare type StoryFnHtmlReturnType = string | Node;
++import { TemplateResult, SVGTemplateResult } from 'lit-element';
++
++export declare type StoryFnHtmlReturnType = string | Node | TemplateResult | SVGTemplateResult;
+ export interface IStorybookStory {
+     name: string;
+     render: () => any;

src/7segment-element.stories.ts

@@ -1,5 +1,5 @@
 import { withKnobs } from '@storybook/addon-knobs';
-import { storiesOf } from '@storybook/polymer';
+import { storiesOf } from '@storybook/web-components';
 import { html } from 'lit-html';
 import './7segment-element';
 import { LitElement, customElement, property } from 'lit-element';

src/led-element.stories.ts

@@ -1,4 +1,4 @@
-import { storiesOf } from '@storybook/polymer';
+import { storiesOf } from '@storybook/web-components';
 import { withKnobs, boolean, text, number } from '@storybook/addon-knobs';
 import { html } from 'lit-html';
 import './led-element';

src/pushbutton-element.stories.ts

@@ -1,4 +1,4 @@
-import { storiesOf } from '@storybook/polymer';
+import { storiesOf } from '@storybook/web-components';
 import { action } from '@storybook/addon-actions';
 import { html } from 'lit-html';
 import './pushbutton-element';

src/resistor-element.stories.ts

@@ -1,4 +1,4 @@
-import { storiesOf } from '@storybook/polymer';
+import { storiesOf } from '@storybook/web-components';
 import { html } from 'lit-html';
 import { withKnobs, number } from '@storybook/addon-knobs';