New sample - CSS in JS with TypeStyle.

samples/react-css-in-js-typestyle/.editorconfig

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+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+
+[*]
+
+# change these settings to your own preference
+indent_style = space
+indent_size = 2
+
+# we recommend you to keep these unchanged
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{package,bower}.json]
+indent_style = space
+indent_size = 2

samples/react-css-in-js-typestyle/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Dependency directories
+node_modules
+
+# Build generated files
+dist
+lib
+solution
+temp
+*.sppkg
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# OSX
+.DS_Store
+
+# Visual Studio files
+.ntvs_analysis.dat
+.vs
+bin
+obj
+
+# Resx Generated Code
+*.resx.ts
+
+# Styles Generated Code
+*.scss.ts

samples/react-css-in-js-typestyle/.yo-rc.json

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+{
+  "@microsoft/generator-sharepoint": {
+    "isCreatingSolution": false,
+    "environment": "spo",
+    "version": "1.10.0",
+    "libraryName": "spfx-css-in-js",
+    "libraryId": "d07a3ba7-a2e7-41df-b2e6-acaf2ed00a33",
+    "packageManager": "npm",
+    "isDomainIsolated": false,
+    "componentType": "webpart"
+  }
+}

samples/react-css-in-js-typestyle/README.md

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+# "CSS in JS" with SharePoint Framework and TypeStyle
+
+## Summary
+
+The web part demonstrates the usage of "CSS in JS" pattern with SharePoint Framework. "CSS in JS" is implemented using [TypeStyle](https://typestyle.github.io/) library. Read more in [the blog post here](https://spblog.net/post/2020/04/22/styling-sharepoint-framework-components-with-css-in-js-approach).
+
+![picture of the web part in action](assets/dynamic-styles.gif)
+
+## Used SharePoint Framework Version
+
+![1.10.0](https://img.shields.io/badge/version-1.10.0-green.svg)
+
+## Applies to
+
+* [SharePoint Framework](https:/dev.office.com/sharepoint)
+* [Office 365 tenant](https://dev.office.com/sharepoint/docs/spfx/set-up-your-development-environment)
+
+## Solution
+
+Solution|Author(s)
+--------|---------
+react-css-in-js-typestyle|[@Sergei Sergeev](https://twitter.com/sergeev_srg) - [Mastaq](https://mastaq.com/)
+
+## Version history
+
+Version|Date|Comments
+-------|----|--------
+1.0|April 24, 2020|Initial release
+
+## Disclaimer
+
+**THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.**
+
+---
+
+## Minimal Path to Awesome
+
+* Clone this repository
+* in the command line run:
+  * `npm install`
+  * `gulp build`
+  * `gulp bundle --ship`
+  * `gulp package-solution --ship`
+* add the webpart to your tenant app store
+* add the app to a SharePoint site and then add the webpart to the page
+
+
+## Features
+
+This Web Part illustrates the following concepts on top of the SharePoint Framework:
+
+* "CSS in JS" pattern adopted to SharePoint Framework
+* Theme support using SharePoint Framework's `ThemeProvider`
+* Dynamically reacting to theme changes without affecting performance
+* React hooks
+
+<img src="https://telemetry.sharepointpnp.com/sp-dev-fx-webparts/samples/react-css-in-js-typestyle" />

samples/react-css-in-js-typestyle/config/config.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/config.2.0.schema.json",
+  "version": "2.0",
+  "bundles": {
+    "dynamic-type-style-web-part": {
+      "components": [
+        {
+          "entrypoint": "./lib/webparts/dynamicTypeStyle/DynamicTypeStyleWebPart.js",
+          "manifest": "./src/webparts/dynamicTypeStyle/DynamicTypeStyleWebPart.manifest.json"
+        }
+      ]
+    }
+  },
+  "externals": {},
+  "localizedResources": {
+    "DynamicTypeStyleWebPartStrings": "lib/webparts/dynamicTypeStyle/loc/{locale}.js"
+  }
+}

samples/react-css-in-js-typestyle/config/copy-assets.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/copy-assets.schema.json",
+  "deployCdnPath": "temp/deploy"
+}

samples/react-css-in-js-typestyle/config/deploy-azure-storage.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/deploy-azure-storage.schema.json",
+  "workingDir": "./temp/deploy/",
+  "account": "<!-- STORAGE ACCOUNT NAME -->",
+  "container": "spfx-css-in-js",
+  "accessKey": "<!-- ACCESS KEY -->"
+}

samples/react-css-in-js-typestyle/config/package-solution.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/package-solution.schema.json",
+  "solution": {
+    "name": "spfx-css-in-js-client-side-solution",
+    "id": "d07a3ba7-a2e7-41df-b2e6-acaf2ed00a33",
+    "version": "1.0.0.0",
+    "includeClientSideAssets": true,
+    "isDomainIsolated": false
+  },
+  "paths": {
+    "zippedPackage": "solution/spfx-css-in-js.sppkg"
+  }
+}

samples/react-css-in-js-typestyle/config/serve.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/core-build/serve.schema.json",
+  "port": 4321,
+  "https": true,
+  "initialPage": "https://localhost:5432/workbench",
+  "api": {
+    "port": 5432,
+    "entryPath": "node_modules/@microsoft/sp-webpart-workbench/lib/api/"
+  }
+}

samples/react-css-in-js-typestyle/config/write-manifests.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/write-manifests.schema.json",
+  "cdnBasePath": "<!-- PATH TO CDN -->"
+}

samples/react-css-in-js-typestyle/gulpfile.js

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+'use strict';
+
+const build = require('@microsoft/sp-build-web');
+
+build.addSuppression(`Warning - [sass] The local CSS class 'ms-Grid' is not camelCase and will not be type-safe.`);
+
+build.initialize(require('gulp'));

samples/react-css-in-js-typestyle/package.json

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+{
+  "name": "spfx-css-in-js",
+  "version": "0.0.1",
+  "private": true,
+  "main": "lib/index.js",
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "build": "gulp bundle",
+    "clean": "gulp clean",
+    "test": "gulp test"
+  },
+  "dependencies": {
+    "@microsoft/sp-core-library": "1.10.0",
+    "@microsoft/sp-lodash-subset": "1.10.0",
+    "@microsoft/sp-office-ui-fabric-core": "1.10.0",
+    "@microsoft/sp-property-pane": "1.10.0",
+    "@microsoft/sp-webpart-base": "1.10.0",
+    "@types/es6-promise": "0.0.33",
+    "@types/react": "16.8.8",
+    "@types/react-dom": "16.8.3",
+    "@types/webpack-env": "1.13.1",
+    "office-ui-fabric-react": "6.189.2",
+    "react": "16.8.5",
+    "react-dom": "16.8.5",
+    "typestyle": "^2.0.4"
+  },
+  "resolutions": {
+    "@types/react": "16.8.8"
+  },
+  "devDependencies": {
+    "@microsoft/sp-build-web": "1.10.0",
+    "@microsoft/sp-tslint-rules": "1.10.0",
+    "@microsoft/sp-module-interfaces": "1.10.0",
+    "@microsoft/sp-webpart-workbench": "1.10.0",
+    "@microsoft/rush-stack-compiler-3.3": "0.3.5",
+    "gulp": "~3.9.1",
+    "@types/chai": "3.4.34",
+    "@types/mocha": "2.2.38",
+    "ajv": "~5.2.2"
+  }
+}

samples/react-css-in-js-typestyle/src/common/AppContext.ts

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+import { createContext } from 'react';
+import { IReadonlyTheme } from '@microsoft/sp-component-base';
+
+const AppContext = createContext<{ theme: IReadonlyTheme }>(undefined);
+
+export default AppContext;

samples/react-css-in-js-typestyle/src/hooks/useThemedStyles.ts

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+import { IReadonlyTheme } from "@microsoft/sp-component-base";
+import { useEffect, useState } from "react";
+
+export const useThemedStyles = <T>(theme: IReadonlyTheme, createStyles: (theme: IReadonlyTheme) => T) => {
+  const [styles, setStyles] = useState<T>(createStyles.bind(null, theme));
+
+  useEffect(() => {
+    setStyles(createStyles(theme));
+  }, [theme]);
+
+  return styles;
+};

samples/react-css-in-js-typestyle/src/index.ts

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+// A file is required to be in the root of the /src directory by the TypeScript compiler

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/DynamicTypeStyleWebPart.manifest.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx/client-side-web-part-manifest.schema.json",
+  "id": "0055998e-a48a-4453-bc2e-ecedebed480d",
+  "alias": "DynamicTypeStyleWebPart",
+  "componentType": "WebPart",
+
+  // The "*" signifies that the version should be taken from the package.json
+  "version": "*",
+  "manifestVersion": 2,
+
+  // If true, the component can only be installed on sites where Custom Script is allowed.
+  // Components that allow authors to embed arbitrary script code should set this to true.
+  // https://support.office.com/en-us/article/Turn-scripting-capabilities-on-or-off-1f2c515f-5d7e-448a-9fd7-835da935584f
+  "requiresCustomScript": false,
+  "supportedHosts": ["SharePointWebPart"],
+  "supportsThemeVariants": true,
+
+  "preconfiguredEntries": [{
+    "groupId": "5c03119e-3074-46fd-976b-c60198311f70", // Other
+    "group": { "default": "Other" },
+    "title": { "default": "DynamicTypeStyle" },
+    "description": { "default": "DynamicTypeStyle description" },
+    "officeFabricIconFontName": "Page",
+    "properties": {
+      "description": "DynamicTypeStyle"
+    }
+  }]
+}

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/DynamicTypeStyleWebPart.ts

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+import * as React from 'react';
+import * as ReactDom from 'react-dom';
+import { Version } from '@microsoft/sp-core-library';
+import {
+  IPropertyPaneConfiguration,
+  PropertyPaneTextField
+} from '@microsoft/sp-property-pane';
+import { BaseClientSideWebPart } from '@microsoft/sp-webpart-base';
+import { ThemeProvider, IReadonlyTheme, ThemeChangedEventArgs } from '@microsoft/sp-component-base';
+import * as strings from 'DynamicTypeStyleWebPartStrings';
+
+import { StylesDemo } from './components/StylesDemo';
+import AppContext from '../../common/AppContext';
+
+export interface IDynamicTypeStyleWebPartProps {
+  description: string;
+}
+
+export default class DynamicTypeStyleWebPart extends BaseClientSideWebPart<IDynamicTypeStyleWebPartProps> {
+
+  private themeProvider: ThemeProvider;
+  private theme: IReadonlyTheme;
+
+  protected onInit(): Promise<void> {
+    this.themeProvider = this.context.serviceScope.consume(ThemeProvider.serviceKey);
+    this.theme = this.themeProvider.tryGetTheme();
+    this.themeProvider.themeChangedEvent.add(this, this.onThemeChanged);
+
+    return super.onInit();
+  }
+
+  public render(): void {
+    const element: React.ReactElement = React.createElement(
+      AppContext.Provider,
+      {
+        value: {
+          theme: { ...this.theme }
+        }
+      },
+      React.createElement(StylesDemo)
+    );
+
+    ReactDom.render(element, this.domElement);
+  }
+
+  private onThemeChanged(args: ThemeChangedEventArgs) {
+    this.theme = args.theme;
+    this.render();
+  }
+
+  protected onDispose(): void {
+    ReactDom.unmountComponentAtNode(this.domElement);
+  }
+
+  protected get dataVersion(): Version {
+    return Version.parse('1.0');
+  }
+
+  protected getPropertyPaneConfiguration(): IPropertyPaneConfiguration {
+    return {
+      pages: [
+        {
+          header: {
+            description: strings.PropertyPaneDescription
+          },
+          groups: [
+            {
+              groupName: strings.BasicGroupName,
+              groupFields: [
+                PropertyPaneTextField('description', {
+                  label: strings.DescriptionFieldLabel
+                })
+              ]
+            }
+          ]
+        }
+      ]
+    };
+  }
+}

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/components/StylesDemo.tsx

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+import * as React from 'react';
+import { TypeStyleButton } from './TypeStyleButton/TypeStyleButton';
+
+export const StylesDemo: React.FC = () => (
+  <div>
+    <div><TypeStyleButton /></div>
+  </div>
+);

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/components/TypeStyleButton/TypeStyleButton.styles.ts

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+import { stylesheet } from "typestyle";
+import { IReadonlyTheme } from "@microsoft/sp-component-base";
+
+export const createStyles = (theme: IReadonlyTheme) => {
+  return stylesheet({
+    root: {
+      margin: "10px",
+    },
+    myButton: {
+      backgroundColor: theme.palette.themePrimary,
+      color: theme.palette.white,
+      height: "60px",
+      lineHeight: "60px",
+      textAlign: "center",
+      fontSize: "16px",
+      padding: "0 15px",
+      cursor: "pointer",
+      borderWidth: "0 0 6px 0",
+      fontWeight: "bold",
+      borderColor: "#4e84c3",
+      borderStyle: "solid",
+      $nest: {
+        "&:hover": {
+          backgroundColor: "#328bf9",
+        }
+      }
+    }
+  });
+};

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/components/TypeStyleButton/TypeStyleButton.tsx

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+import * as React from 'react';
+
+import { createStyles } from "./TypeStyleButton.styles";
+import { useThemedStyles } from '../../../../hooks/useThemedStyles';
+import AppContext from '../../../../common/AppContext';
+
+export const TypeStyleButton: React.FC = () => {
+  const { theme } = React.useContext(AppContext);
+  const styles = useThemedStyles(theme, createStyles);
+
+  const [enabled, setEnabled] = React.useState(true);
+
+  const toggleEnable = () => {
+    setEnabled(!enabled);
+  };
+
+  return (
+    <div className={styles.root}>
+      <button onClick={toggleEnable} className={styles.myButton}>Hello from a TypeStyle button! The state is {enabled ? "enabled" : "disabled"}</button>
+    </div>
+  );
+};

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/loc/en-us.js

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+define([], function() {
+  return {
+    "PropertyPaneDescription": "Description",
+    "BasicGroupName": "Group Name",
+    "DescriptionFieldLabel": "Description Field"
+  }
+});

samples/react-css-in-js-typestyle/src/webparts/dynamicTypeStyle/loc/mystrings.d.ts

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+declare interface IDynamicTypeStyleWebPartStrings {
+  PropertyPaneDescription: string;
+  BasicGroupName: string;
+  DescriptionFieldLabel: string;
+}
+
+declare module 'DynamicTypeStyleWebPartStrings' {
+  const strings: IDynamicTypeStyleWebPartStrings;
+  export = strings;
+}

samples/react-css-in-js-typestyle/tsconfig.json

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+{
+  "extends": "./node_modules/@microsoft/rush-stack-compiler-3.3/includes/tsconfig-web.json",
+  "compilerOptions": {
+    "target": "es5",
+    "forceConsistentCasingInFileNames": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "jsx": "react",
+    "declaration": true,
+    "sourceMap": true,
+    "experimentalDecorators": true,
+    "skipLibCheck": true,
+    "outDir": "lib",
+    "inlineSources": false,
+    "strictNullChecks": false,
+    "noUnusedLocals": false,
+    "typeRoots": [
+      "./node_modules/@types",
+      "./node_modules/@microsoft"
+    ],
+    "types": [
+      "es6-promise",
+      "webpack-env"
+    ],
+    "lib": [
+      "es5",
+      "dom",
+      "es2015.collection"
+    ]
+  },
+  "include": [
+    "src/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "lib"
+  ]
+}

samples/react-css-in-js-typestyle/tslint.json

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+{
+  "extends": "@microsoft/sp-tslint-rules/base-tslint.json",
+  "rules": {
+    "class-name": false,
+    "export-name": false,
+    "forin": false,
+    "label-position": false,
+    "member-access": true,
+    "no-arg": false,
+    "no-console": false,
+    "no-construct": false,
+    "no-duplicate-variable": true,
+    "no-eval": false,
+    "no-function-expression": true,
+    "no-internal-module": true,
+    "no-shadowed-variable": true,
+    "no-switch-case-fall-through": true,
+    "no-unnecessary-semicolons": true,
+    "no-unused-expression": true,
+    "no-use-before-declare": true,
+    "no-with-statement": true,
+    "semicolon": true,
+    "trailing-comma": false,
+    "typedef": false,
+    "typedef-whitespace": false,
+    "use-named-parameter": true,
+    "variable-name": false,
+    "whitespace": false
+  }
+}