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Angular meets Project Fugu: Produktivitäts-PWAs auf Desktopniveau (Hands-on)

Angular meets Project Fugu: Produktivitäts-PWAs auf Desktopniveau (Hands-on)

Progressive Web Apps sind ein plattformübergreifend einsetzbares Anwendungsmodell auf Web-Basis. Dank Project Fugu, einer Initiative der Chrome-Contributors Google, Microsoft und Intel, wird das Web um noch mächtigere Features erweitert. Damit können Entwickler endlich auch Produktivitäts-Apps wie Büro- und Bearbeitungsprogramme oder IDEs sinnvoll ins Web bringen. In diesem Workshop zeigt Ihnen Christian Liebel von Thinktecture, wie Sie mit Angular Produktivitätsapps auf Desktopniveau entwickeln können – Zugriff auf das Dateisystem und die Zwischenablage sowie Dateizuordnungen inklusive. Und Sie können mitentwickeln: Bitte bringen Sie dazu Ihr Notebook (ohne Corporate-Proxys/Unternehmensrichtlinien) mit installiertem Google Chrome Canary, Node.js und Microsoft Visual Studio Code mit.

Christian Liebel
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March 24, 2021
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  1. Angular meets Project Fugu
    Produktivitäts-PWAs auf Desktopniveau
    Christian Liebel
    @christianliebel
    Consultant

    View Slide

  2. Hello, it’s me.
    Angular meets Project Fugu
    Produktivitäts-PWAs auf Desktopniveau
    Christian Liebel
    Twitter:
    @christianliebel
    Email:
    christian.liebel
    @thinktecture.com
    Angular & PWA
    Slides:
    thinktecture.com
    /christian-liebel

    View Slide

  3. Angular meets Project Fugu
    Produktivitäts-PWAs auf Desktopniveau
    Timetable
    09:00–10:30 Block 1
    10:30–11:00 Break
    11:00–12:30 Block 2

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  4. Things NOT to expect
    - Blueprint for PWA
    development
    - No AuthN/AuthZ
    - No 1:1 support
    Things To Expect
    - Extensive/up-to-date insights
    into PWA and Project Fugu
    - A productivity app use case
    that works on your desktop &
    smartphone
    - Lots of fun
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  5. https://paint.js.org
    – Productivity app
    – Draw images
    – Lots of actions & tools
    – Installable
    – Read/save files
    – Copy/paste images
    from/to clipboard
    – Share files to other apps
    – Register for file extensions
    Demo Use Case
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  6. (Workshop Edition)
    – Productivity app
    – Draw images
    – Lots of actions & tools
    – Installable
    – Read/save files
    – Copy/paste images
    from/to clipboard
    – Share files to other apps
    – Register for file extensions
    Demo Use Case
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  7. Setup complete?
    (Node.js, Google Chrome, Editor, Git)
    Setup (1/3)
    LAB
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  8. Optional
    Download and install Chrome Canary:
    https://www.google.com/intl/de/chrome/canary/
    Setup (2/3)
    LAB
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  9. git clone https://github.com/thinktecture/angular-
    days-spring-2021-fugu.git
    cd angular-days-spring-2021-fugu
    npm i
    npm start
    Setup (3/3)
    LAB
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  10. Paint PWA Capabilities
    Progressive
    Enhancement
    Agenda
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  11. Paint PWA Capabilities
    Progressive
    Enhancement
    Agenda
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  12. Canvas
    – Plain bitmap for the web
    – Cross-platform, hardware-
    accelerated graphics
    operations
    – Supports different contexts
    (2D, 3D: WebGL, WebGL 2.0)
    – Supported on all evergreen
    browsers and on IE 9+
    Paint
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  13. Canvas
    Add a canvas element to app.component.html (line 5):

    Query the canvas element in app.component.ts (line 10):
    @ViewChild('canvas') canvas: ElementRef;
    context: CanvasRenderingContext2D;
    Paint
    EX #1
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  14. Canvas 2D Context
    fillRect(x, y, width, height)
    strokeRect(x, y, width, height)
    beginPath()
    moveTo(x, y)
    lineTo(x, y)
    fill()
    stroke()
    Paint
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  15. Canvas 2D Context
    Get the 2D context and prepare the canvas in app.component.ts in the
    method ngAfterViewInit():
    const canvas = this.canvas.nativeElement;
    const ctx = this.context = canvas.getContext('2d');
    ctx.fillStyle = 'white';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    ctx.fillStyle = 'black';
    Paint
    EX #2
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  16. Low-latency Rendering
    Paint
    Web pages need to synchronize
    with the DOM on graphics updates
    causing latencies that can make
    drawing difficult
    Low-latency rendering skips
    syncing with the DOM with can lead
    to a more natural experience
    Supported on Chrome (Chrome OS
    and Windows only)
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  17. Low-latency Rendering
    Opt-in to low-latency rendering (app.component.ts):
    const ctx = this.context = canvas.getContext('2d', {
    desynchronized: true
    });
    Paint
    EX #3
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  18. Pointer Events
    Paint
    Users nowadays use different
    input methods, cross-platform
    apps should cover all of them
    Pointer Events offer an
    abstract interface to catch all
    input methods (pointerdown,
    pointermove, pointerup)
    event.offsetX/event.offsetY
    contain the pointer’s position
    relative to the listener
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  19. Pointer Events
    Add event listeners (app.component.html and app.component.ts):
    (pointerdown)="onPointerDown($event)"
    (pointermove)="onPointerMove(canvas, $event)"
    (pointerup)="onPointerUp()">
    onPointerMove(canvas: HTMLCanvasElement, event: PointerEvent): void {
    this.context.fillRect(~~event.offsetX, ~~event.offsetY, 2, 2);
    }
    Paint
    EX #4
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  20. Bresenham Line Algorithm
    The user may move faster than
    the input can be processed
    For this case, we need to
    remember the previous point
    and interpolate the points in
    between
    The Bresenham line algorithm
    calculates the missing pixels
    between two given points
    Paint
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  21. Bresenham Line Algorithm
    Update the method onPointerMove() in app.component.ts:
    if (this.previousPoint) {
    const currentPoint = {x: Math.floor(event.offsetX), y:
    Math.floor(event.offsetY)};
    const points = this.paintService.bresenhamLine(this.previousPoint.x,
    this.previousPoint.y, currentPoint.x, currentPoint.y);
    for (const {x, y} of points) {
    this.context.fillRect(x, y, 2, 2);
    this.previousPoint = currentPoint;
    }
    }
    Paint
    EX #5
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  22. Color Selection
    For this demo, we will only
    implement the brush tool. However,
    we want to bring in some color.
    A simple method to implement a
    color selection is to use the HTML
    color-type input element that
    shows the native color picker:

    Paint
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  23. Color Selection
    1. In app.component.html, add the following input to the node:

    2. In app.component.ts, add the following code in the method
    colorChange():
    this.context.fillStyle = $event.target.value;
    Paint
    EX #6
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  24. Paint PWA Capabilities
    Progressive
    Enhancement
    Agenda
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  25. Responsive Linkable Discoverable Installable App-like
    Connectivity
    Independent
    Fresh Safe Re-engageable Progressive
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  26. Web App
    Manifest
    Service
    Worker
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  27. Web App Manifest
    Distinguishes Web Apps from
    Websites
    JSON-based file containing
    metadata for apps only
    Apps can be identified by search
    engines, app store providers, etc.
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  28. manifest.webmanifest
    {
    "short_name": "Paint",
    "name": "Paint Workshop",
    "theme_color": "white",
    "icons": [{
    "src": "icon.png",
    "sizes": "512x512"
    }],
    "start_url": "/index.html",
    "display": "standalone",
    "shortcuts": [/* … */]
    }
    PWA
    Names
    Icons
    Display Mode
    Shortcuts
    Start URL
    Theme color (status bar/window bar)
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  29. Manifest Display Modes
    PWA

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  30. Manifest Icon Purposes
    (any)
    any context (e.g. app icon)
    monochrome
    different color requirements
    (at risk)
    maskable
    user agent masks icon as required
    PWA
    Safe Zone
    Windows iOS Android
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  31. Web App Manifest
    1. In your console, run: npx ng add @angular/pwa
    2. Update the new file manifest.webmanifest and set:
    a) name and short_name to values of your choice
    b) theme_color to #000080 and background_color to #808080
    3. In index.html, set theme_color to #000080 as well.
    4. Run npm run start
    5. Test manifest in DevTools: F12 > Application > Manifest
    PWA
    EX #7
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  32. Manifest Shortcuts
    PWA
    Secondary entrypoints for your
    application (e.g., home screen
    quick actions, jump lists, …)
    Static definition in Web App
    Manifest
    Dynamic API may follow in the
    future
    Supported by Google Chrome
    for Android
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  33. Web App Manifest
    1. In manifest.webmanifest, add (at least) the following shortcut:
    "shortcuts": [{
    "name": "About Paint",
    "short_name": "About",
    "description": "Show information about Paint",
    "url": "/index.html",
    "icons": [{ "src": "assets/icons/icon-512x512.png", "sizes": "512x512" }]
    }],
    2. Test in DevTools: F12 > Application > Manifest
    PWA
    EX #8
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  34. Web App Manifest – Chrome Installability Signals
    Web App is not already installed
    Meets a user engagement heuristic (previously: user has interacted with
    domain for at least 30 seconds)
    Includes a Web App Manifest that has short_name or name, at least a
    192px and 512px icon, a start_url and a display mode of fullscreen,
    standalone or minimal-ui
    Served over HTTPS
    Has a registered service worker with a fetch event handler
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  35. Service Worker
    JavaScript snippet executed in an
    own thread, registered by the website
    Acts as a controller, proxy, or
    interceptor
    Has a cache to store responses (for
    offline availability and performance)
    Can wake up even when the website
    is closed and perform background
    tasks (e.g., push notifications or sync)
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  36. Service Worker
    PWA
    Service
    Worker
    Internet
    Website
    HTML/JS
    Cache
    fetch
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  37. NgServiceWorker
    Angular CLI supports Service
    Worker generation by simply
    adding PWA support:
    ng add @angular/pwa
    One-size-fits-all Service
    Worker
    Pre-defined functionality,
    limited customizability
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  38. Workbox
    Toolchain by Google
    Includes a CLI
    Generates a service worker
    implementation from directory
    contents (e.g., build output, or
    our development directory)
    Allows you to modify the
    service worker behavior
    (maximum flexibility)
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  39. Service Worker
    1. Start build with npm run build -- --prod
    2. Go to dist folder: cd dist/angular-days-spring-2021-fugu
    3. Start with npx lite-server
    4. Test in DevTools: F12 > Application > Service Worker
    5. Install the app: Address Bar > ⊕ Install
    PWA
    EX #9
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  40. Push Notifications
    Just as native apps, PWAs
    can receive push notifications
    Combination of two
    technologies: Web
    Notifications and Push API
    (Not supported on Safari for
    macOS, iOS and iPadOS!)
    Angular meets Project Fugu
    Produktivitäts-PWAs auf Desktopniveau
    PWA

    View Slide

  41. Service Worker Debugging
    More information on installed
    service workers can be found on
    • chrome://serviceworker-
    internals (Google Chrome)
    • about:serviceworkers
    (Mozilla Firefox)
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  42. Service Worker Debugging
    PWA
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  43. Lighthouse
    PWA
    Auditing tool by Google,
    integrated in Chrome DevTools
    Automatically checks
    performance metrics, PWA
    support, accessibility, SEO and
    other best practices and gives
    tips on how to improve
    Can simulate mobile devices
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  44. Lighthouse
    1. Make sure only one tab/window of your PWA is open
    2. Open DevTools: F12 > Lighthouse
    3. Make sure to select at least the “Progressive Web App” category
    4. Click “Generate report”
    PWA
    EX #10
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  45. Paint PWA Capabilities
    Progressive
    Enhancement
    Agenda
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  46. Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  47. Project Fugu
    Capabilities
    »Let’s bring the web
    back – API by API«
    Thomas Steiner, Google
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  48. Capabilities
    Contacts
    Picker
    Screen Wake
    Lock API
    File System
    Access API
    Shape
    Detection API
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  49. Capabilities
    https://goo.gle/fugu-api-tracker
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  50. Fugu Process
    – Write an Explainer (https://github.com/WICG/native-file-
    system/blob/master/EXPLAINER.md)
    – Discuss capability with developers, browser vendors, standard orgs
    – Iterate
    – Compile a design document
    – W3C TAG Review (https://github.com/w3ctag/design-
    reviews/issues/390)
    – Formal spec within Web Incubator Community Group (WICG,
    https://wicg.github.io/native-file-system/)
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  51. Fugu Process
    – Implementation in Chromium
    – Launches behind a flag (chrome://flags/#enable-experimental-web-
    platform-features)
    – Origin Trial (https://developers.chrome.com/origintrials/)
    – Transfer to W3C Working Group + Recommendation?
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  52. Capabilities
    navigator.share({ url: 'http://example.com' });
    ShareIntent DataTransferManager

    NSSharingServicePicker
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  53. File System Access API
    Some applications heavily rely
    on working with files (e.g.
    Visual Studio Code, Adobe
    Photoshop, …)
    File System Access API allows
    you to open, save and override
    files and directories
    Shipped with Google Chrome
    86
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  54. File System Access API
    1. Add the following buttons to the bar in app.component.html (before the color
    input):
    Open
    Save
    Copy
    Paste
    Share
    Capabilities
    EX #11
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  55. File System Access API
    2. Add the following lines at the top of app.component.ts:
    private fileOptions = {
    types: [{
    description: 'PNG files',
    accept: {'image/png': ['.png']}
    }]
    };
    Capabilities
    EX #11
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  56. File System Access API
    3. Add the following lines in the method save of app.component.ts:
    const blob = await this.paintService.toBlob(this.canvas.nativeElement);
    const handle = await (window as any).showSaveFilePicker(this.fileOptions);
    const writable = await handle.createWritable();
    await writable.write(blob);
    await writable.close();
    Capabilities
    EX #11
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  57. File System Access API
    Add the following code int the method open() of app.component.ts:
    const [handle] = await (window as any).showOpenFilePicker(this.fileOptions);
    const file = await handle.getFile();
    const image = await this.paintService.getImage(file);
    this.context.drawImage(image, 0, 0);
    Capabilities
    EX #12
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  58. Async Clipboard API
    Allows reading from/writing to
    the clipboard in an
    asynchronous manner (UI won’t
    freeze during long-running
    operations)
    Reading from the clipboard
    requires user consent first
    (privacy!)
    Supported by Chrome, Edge
    and Safari
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  59. Async Clipboard API
    Add the following code in the method copy() of app.component.ts:
    const blob = await this.paintService.toBlob(this.canvas.nativeElement);
    await navigator.clipboard.write([
    new ClipboardItem({[blob.type]: blob})
    ]);
    Capabilities
    EX #13
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  60. Async Clipboard API
    Add the following code in the method paste() of app.component.ts:
    const clipboardItems = await navigator.clipboard.read();
    for (const clipboardItem of clipboardItems) {
    for (const type of clipboardItem.types) {
    if (type === 'image/png') {
    const blob = await clipboardItem.getType(type);
    const image = await this.paintService.getImage(blob);
    this.context.drawImage(image, 0, 0);
    }
    }
    }
    Capabilities
    EX #14
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  61. Web Share API
    Allows sharing a title, URL, text, or
    files
    API can only be invoked as a
    result of a user action (i.e. a click
    or keypress)
    Files supported in Chrome on
    Android, Edge on Windows
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  62. Web Share API
    Add the following code in the share() method in the app.component.ts:
    const blob = await this.paintService.toBlob(this.canvas.nativeElement);
    const file = new File([blob], 'untitled.png', {type: 'image/png'});
    const item = {files: [file], title: 'untitled.png'};
    if (await navigator.canShare(item)) {
    await navigator.share(item);
    }
    Capabilities
    EX #15
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  63. File System Handling API
    Register your PWA as a
    handler for file extensions
    Requires installing the
    application first
    Declare supported extensions
    in Web App Manifest and add
    imperative code to your
    application logic
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  64. File System Handling API
    1. Enable the following flag in Chrome Canary and restart the browser:
    chrome://flags/#file-handling-api
    2. Add the following property to your manifest (manifest.webmanifest):
    "file_handlers": [{
    "action": "/index.html",
    "accept": {
    "image/png": [".png"]
    }
    }]
    Capabilities
    EX #16
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  65. File System Handling API
    3. Add the following code to the bottom of the ngAfterViewInit() method of app.component.ts:
    if ('launchQueue' in window) {
    (window as any).launchQueue.setConsumer(async params => {
    const [handle] = params.files;
    if (handle) {
    const file = await handle.getFile();
    const image = await this.paintService.getImage(file);
    ctx.drawImage(image, 0, 0);
    }
    });
    }
    4. Re-generate Service Worker: npm run build -- --prod in main folder
    5. Go to dist/angular-days-spring-2021-fugu and run npx lite-server
    Capabilities
    EX #16
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  66. Summary
    - Project Fugu helps the web to become more and more capable
    - Project Fugu APIs could bring many more app experiences to the web
    (IDEs, productivity apps, etc.)
    - But: Web is threatened by alternative approaches and platforms,
    support for modern Web API varies from platform to platform
    - You can make a difference!
    - File bugs in browser engine bugtrackers
    - File Fugu requests: https://goo.gle/new-fugu-request
    Capabilities
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  67. Paint PWA Capabilities
    Progressive
    Enhancement
    Agenda
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  68. Overview
    Use available interfaces and functions of
    a system (opposite of Graceful
    Degradation)
    Users with modern, feature-rich
    browsers get a better experience
    Apps are available on older browsers, but
    with limited functionality
    Concept: Browser feature support should
    grow over time—thereby more users can
    enjoy an increasing number of features
    Progressive Enhancement
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  69. Overview
    if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register(…)
    .then(() => /* … */);
    }
    In JavaScript: check whether an API/feature is available. If yes—use it!
    Otherwise:
    1. Disable the functionality
    2. Fall back to an alternative API (if available)
    Progressive Enhancement
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

    View Slide

  70. New powerful APIs regularly ship with new releases of Chromium-based
    browsers
    Some only add minor finishing touches, others enable whole application
    categories as productivity apps to finally make the shift to the web
    Some APIs already made their way into other browsers (e.g., Web Share)
    Fugu process makes sure that capabilities are implemented in a secure,
    privacy-preserving manner
    Let’s make the web a more capable platform!
    Summary
    Produktivitäts-PWAs auf Desktopniveau
    Angular meets Project Fugu

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  71. Thank you
    for your kind attention!
    Christian Liebel
    @christianliebel
    [email protected]

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