Add initial files for April Fools application customizer

samples/react-copilot-aprils-fool/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Dependency directories
+node_modules
+
+# Build generated files
+dist
+lib
+release
+solution
+temp
+*.sppkg
+.heft
+
+# 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-copilot-aprils-fool/.npmignore

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+!dist
+config
+
+gulpfile.js
+
+release
+src
+temp
+
+tsconfig.json
+tslint.json
+
+*.log
+
+.yo-rc.json
+.vscode

samples/react-copilot-aprils-fool/.yo-rc.json

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+{
+  "@microsoft/generator-sharepoint": {
+    "whichFolder": "subdir",
+    "solutionName": "react-copilot-aprils-fool",
+    "componentType": "extension",
+    "extensionType": "ApplicationCustomizer",
+    "template": "none",
+    "componentName": "Copilot April Fools",
+    "plusBeta": false,
+    "isCreatingSolution": true,
+    "nodeVersion": "20.16.0",
+    "sdksVersions": {
+      "@microsoft/microsoft-graph-client": "3.0.2",
+      "@microsoft/teams-js": "2.24.0"
+    },
+    "version": "1.20.0",
+    "libraryName": "react-copilot-aprils-fool",
+    "libraryId": "4389f8df-31ed-4999-8fc5-42fcdc338894",
+    "environment": "spo",
+    "packageManager": "npm",
+    "solutionShortDescription": "react-copilot-aprils-fool description",
+    "skipFeatureDeployment": true,
+    "isDomainIsolated": false
+  }
+}

samples/react-copilot-aprils-fool/README.md

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+# react-copilot-aprils-fool
+
+## Summary
+
+This solution is a sample of an SPFx application customizer that display message in the header of the SharePoint site with sample of button which inverts colors for 5sec. The message is displayed only on April 1st.
+
+![Sample](./assets/Sample.png)
+
+## Used SharePoint Framework Version
+
+![version](https://img.shields.io/badge/version-1.20.0-green.svg)
+
+## Applies to
+
+- [SharePoint Framework](https://aka.ms/spfx)
+- [Microsoft 365 tenant](https://docs.microsoft.com/en-us/sharepoint/dev/spfx/set-up-your-developer-tenant)
+
+> Get your own free development tenant by subscribing to [Microsoft 365 developer program](http://aka.ms/o365devprogram)
+
+## Solution
+
+| Solution    | Author(s)                                               |
+| ----------- | ------------------------------------------------------- |
+| react-copilot-aprils-fool |  Valeras Narbutas |
+
+## Version history
+
+| Version | Date             | Comments        |
+| ------- | ---------------- | --------------- |
+| 1.0     | March 23, 2025 | 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
+- Ensure that you are at the solution folder
+- in the command-line run:
+  - **npm install**
+  - **gulp serve**
+
+> Include any additional steps as needed.
+
+## Features
+
+This Web Part illustrates the following concepts on top of the SharePoint Framework:
+
+- Display custom banners (informational, alerts, notifications)
+- Add floating buttons for shortcuts or actions (like theme switchers, accessibility tools)
+
+> Share your web part with others through Microsoft 365 Patterns and Practices program to get visibility and exposure. More details on the community, open-source projects and other activities from http://aka.ms/m365pnp.
+
+## References
+
+- [Getting started with SharePoint Framework](https://docs.microsoft.com/en-us/sharepoint/dev/spfx/set-up-your-developer-tenant)
+- [Building for Microsoft teams](https://docs.microsoft.com/en-us/sharepoint/dev/spfx/build-for-teams-overview)
+- [Use Microsoft Graph in your solution](https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/get-started/using-microsoft-graph-apis)
+- [Publish SharePoint Framework applications to the Marketplace](https://docs.microsoft.com/en-us/sharepoint/dev/spfx/publish-to-marketplace-overview)
+- [Microsoft 365 Patterns and Practices](https://aka.ms/m365pnp) - Guidance, tooling, samples and open-source controls for your Microsoft 365 development

samples/react-copilot-aprils-fool/assets/sample.json

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+[
+    {
+        "name": "pnp-sp-dev-spfx-extensions-react-copilot-aprils-fool",
+        "source": "pnp",
+        "title": "Copilot April's Fool",
+        "shortDescription": "An extention to privide a simple approach to display custom messages in SharePoint Online.",
+        "url": "https://github.com/pnp/sp-dev-fx-extensions/tree/main/samples/react-copilot-aprils-fool",
+        "downloadUrl": "https://pnp.github.io/download-partial/?url=https://github.com/pnp/sp-dev-fx-extensions/tree/main/samples/react-copilot-aprils-fool",
+        "longDescription": [
+            "An extention to privide a simple approach to display custom messages in SharePoint Online."
+        ],
+        "creationDateTime": "2025-03-23",
+        "updateDateTime": "2025-03-23",
+        "products": [
+            "SharePoint"
+        ],
+        "metadata": [
+            {
+                "key": "CLIENT-SIDE-DEV",
+                "value": "React"
+            },
+            {
+                "key": "SPFX-VERSION",
+                "value": "1.20.0"
+            }
+        ],
+        "thumbnails": [
+            {
+                "type": "image",
+                "order": 100,
+                "url": "https://github.com/pnp/sp-dev-fx-extensions/raw/main/samples/react-copilot-aprils-fool/assets/sample.png",
+                "alt": "Extension Preview"
+            }
+        ],
+        "authors": [
+            {
+                "gitHubAccount": "ValerasNarbutas",
+                "pictureUrl": "https://github.com/ValerasNarbutas.png",
+                "name": "Valeras Narbutas"
+            }
+        ],
+        "references": [
+            {
+                "name": "Overview of SharePoint Framework Extensions",
+                "description": "You can use SharePoint Framework (SPFx) Extensions to extend the SharePoint user experience. With SPFx Extensions, you can customize more facets of the SharePoint experience, including notification areas, toolbars, and list data views. SPFx Extensions are available in all Microsoft 365 subscriptions for production usage.",
+                "url": "https://docs.microsoft.com/sharepoint/dev/spfx/extensions/overview-extensions?WT.mc_id=m365-15741-cxa"
+              }
+        ]
+    }
+]

samples/react-copilot-aprils-fool/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": {
+    "copilot-april-fools-application-customizer": {
+      "components": [
+        {
+          "entrypoint": "./lib/extensions/copilotAprilFools/CopilotAprilFoolsApplicationCustomizer.js",
+          "manifest": "./src/extensions/copilotAprilFools/CopilotAprilFoolsApplicationCustomizer.manifest.json"
+        }
+      ]
+    }
+  },
+  "externals": {},
+  "localizedResources": {
+    "CopilotAprilFoolsApplicationCustomizerStrings": "lib/extensions/copilotAprilFools/loc/{locale}.js"
+  }
+}

samples/react-copilot-aprils-fool/config/deploy-azure-storage.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/deploy-azure-storage.schema.json",
+  "workingDir": "./release/assets/",
+  "account": "<!-- STORAGE ACCOUNT NAME -->",
+  "container": "react-copilot-aprils-fool",
+  "accessKey": "<!-- ACCESS KEY -->"
+}

samples/react-copilot-aprils-fool/config/package-solution.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/package-solution.schema.json",
+  "solution": {
+    "name": "react-copilot-aprils-fool-client-side-solution",
+    "id": "4389f8df-31ed-4999-8fc5-42fcdc338894",
+    "version": "1.0.0.0",
+    "includeClientSideAssets": true,
+    "skipFeatureDeployment": true,
+    "isDomainIsolated": false,
+    "developer": {
+      "name": "",
+      "websiteUrl": "",
+      "privacyUrl": "",
+      "termsOfUseUrl": "",
+      "mpnId": "Undefined-1.20.0"
+    },
+    "metadata": {
+      "shortDescription": {
+        "default": "react-copilot-aprils-fool description"
+      },
+      "longDescription": {
+        "default": "react-copilot-aprils-fool description"
+      },
+      "screenshotPaths": [],
+      "videoUrl": "",
+      "categories": []
+    },
+    "features": [
+      {
+        "title": "Application Extension - Deployment of custom action",
+        "description": "Deploys a custom action with ClientSideComponentId association",
+        "id": "695ef80e-f50f-4957-865d-98b6bd3d2042",
+        "version": "1.0.0.0",
+        "assets": {
+          "elementManifests": [
+            "elements.xml",
+            "ClientSideInstance.xml"
+          ]
+        }
+      }
+    ]
+  },
+  "paths": {
+    "zippedPackage": "solution/react-copilot-aprils-fool.sppkg"
+  }
+}

samples/react-copilot-aprils-fool/config/sass.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/core-build/sass.schema.json"
+}

samples/react-copilot-aprils-fool/config/serve.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/spfx-serve.schema.json",
+  "port": 4321,
+  "https": true,
+  "serveConfigurations": {
+    "default": {
+      "pageUrl": "https://{tenantDomain}/SitePages/myPage.aspx",
+      "customActions": {
+        "2d2e1a0b-88b4-40ad-8f55-91055395b77c": {
+          "location": "ClientSideExtension.ApplicationCustomizer",
+          "properties": {
+            "testMessage": "Test message"
+          }
+        }
+      }
+    },
+    "copilotAprilFools": {
+      "pageUrl": "https://{tenantDomain}/SitePages/myPage.aspx",
+      "customActions": {
+        "2d2e1a0b-88b4-40ad-8f55-91055395b77c": {
+          "location": "ClientSideExtension.ApplicationCustomizer",
+          "properties": {
+            "testMessage": "Test message"
+          }
+        }
+      }
+    }
+  }
+}

samples/react-copilot-aprils-fool/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-copilot-aprils-fool/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.`);
+
+var getTasks = build.rig.getTasks;
+build.rig.getTasks = function () {
+  var result = getTasks.call(build.rig);
+
+  result.set('serve', result.get('serve-deprecated'));
+
+  return result;
+};
+
+build.initialize(require('gulp'));