Initial version

Author: Hugo Bernier

.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

.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

.vscode/extensions.json

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+{
+  "recommendations": [
+    "msjsdiag.debugger-for-chrome"
+  ]
+}

.vscode/launch.json

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+{
+  /**
+   * Install Chrome Debugger Extension for Visual Studio Code to debug your components with the
+   * Chrome browser: https://aka.ms/spfx-debugger-extensions
+   */
+  "version": "0.2.0",
+  "configurations": [{
+      "name": "Local workbench",
+      "type": "chrome",
+      "request": "launch",
+      "url": "https://localhost:4321/temp/workbench.html",
+      "webRoot": "${workspaceRoot}",
+      "sourceMaps": true,
+      "sourceMapPathOverrides": {
+        "webpack:///../../../src/*": "${webRoot}/src/*",
+        "webpack:///../../../../src/*": "${webRoot}/src/*",
+        "webpack:///../../../../../src/*": "${webRoot}/src/*"
+      },
+      "runtimeArgs": [
+        "--remote-debugging-port=9222"
+      ]
+    },
+    {
+      "name": "Hosted workbench",
+      "type": "chrome",
+      "request": "launch",
+      "url": "https://enter-your-SharePoint-site/_layouts/workbench.aspx",
+      "webRoot": "${workspaceRoot}",
+      "sourceMaps": true,
+      "sourceMapPathOverrides": {
+        "webpack:///../../../src/*": "${webRoot}/src/*",
+        "webpack:///../../../../src/*": "${webRoot}/src/*",
+        "webpack:///../../../../../src/*": "${webRoot}/src/*"
+      },
+      "runtimeArgs": [
+        "--remote-debugging-port=9222",
+        "-incognito"
+      ]
+    }
+  ]
+}

.vscode/settings.json

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+// Place your settings in this file to overwrite default and user settings.
+{
+  // Configure glob patterns for excluding files and folders in the file explorer.
+  "files.exclude": {
+    "**/.git": true,
+    "**/.DS_Store": true,
+    "**/bower_components": true,
+    "**/coverage": true,
+    "**/lib-amd": true,
+    "src/**/*.scss.ts": true
+  },
+  "typescript.tsdk": ".\\node_modules\\typescript\\lib"
+}

.yo-rc.json

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+{
+  "@microsoft/generator-sharepoint": {
+    "version": "1.4.1",
+    "libraryName": "react-application-injectcss",
+    "libraryId": "b2322574-549b-4510-99d8-1351d9457a97",
+    "environment": "spo"
+  }
+}

README.md

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-# react-application-injectcss
-An SPFx extension that injects CSS on every page
+# Spfx Applications Customiser CSS Injection
+
+## Summary
+This sample shows how to inject a custom Cascading Style Sheet (CSS) on modern pages.
+
+![Sample super ugly CSS](./assets/sampleresults.png)
+
+__Note__: This code is provided as a sample only. Keep in mind that Microsoft may change page elements and styles at any time, rendering your custom CSS useless. It is preferrable to use well-known HTML element placeholders.
+
+When you need to make minor cosmetic changes to modern pages (e.g.:  match your corporate branding guidelines) and cannot use placeholders,you can create a custom CSS and inject on every modern page.
+
+
+## Used SharePoint Framework Version
+
+![SPFx v1.4.1](https://img.shields.io/badge/SPFx-1.4.1-green.svg)
+
+## Applies to
+
+* [SharePoint Framework Extensions](https://dev.office.com/sharepoint/docs/spfx/extensions/overview-extensions)
+* [Office 365 developer tenant](http://dev.office.com/sharepoint/docs/spfx/set-up-your-developer-tenant)
+
+## Solution
+
+Solution|Author(s)
+--------|---------
+react-application-injectcss|Hugo Bernier ([Tahoe Ninjas](http://tahoeninjas.blog), @bernierh)
+
+## Version history
+
+Version|Date|Comments
+-------|----|--------
+1.0.0|07 May, 2018|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 repo
+* create a custom CSS file that meets your needs. For example, this CSS will make the site logos round and will add an ugly red colour at the top of every page.
+
+```
+.ms-compositeHeader {
+    background-color: red;
+}
+
+.ms-siteLogoContainerOuter {
+    border-radius: 50%;
+    border-width: 3px;
+}
+
+.ms-siteLogo-actual {
+    border-radius: 50%;
+}
+```
+* upload the CSS file to a shared location on your SharePoint tenant. For example, in the `Styles Library` of the root site collection.
+* get the URL to your custom CSS. For example: `/Style%20Library/custom.css`
+
+* update _serve.json_ pointing to your site collection home page change the `cssurl` property with the URL to your custom CSS.
+* run _gulp serve_
+
+## Features
+
+Sample SharePoint Framework application customiser injecting a custom CSS in the HTML header.
+
+This sample illustrates the following concepts on top of the SharePoint Framework:
+
+* HTML manipulation

assets/sampleresults.png

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+{
+  "$schema": "https://dev.office.com/json-schemas/spfx-build/config.2.0.schema.json",
+  "version": "2.0",
+  "bundles": {
+    "inject-css-application-customizer": {
+      "components": [
+        {
+          "entrypoint": "./lib/extensions/injectCss/InjectCssApplicationCustomizer.js",
+          "manifest": "./src/extensions/injectCss/InjectCssApplicationCustomizer.manifest.json"
+        }
+      ]
+    }
+  },
+  "externals": {},
+  "localizedResources": {
+    "InjectCssApplicationCustomizerStrings": "lib/extensions/injectCss/loc/{locale}.js"
+  }
+}

config/config.json

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