Piral-pwa NPM | npm.io

Piral PWA ·

This is a plugin that has a peer dependency to piral-core and requires parcel-bundler to work.

::: warning: Only use with Parcel

Most likely this plugin will only work with piral-cli-parcel as it depends on a codegen that assumes Parcel is in charge of bundling. If you need something similar for Webpack have a look here, or even better here.

:::

What piral-pwa brings to the table is a simple way to expose your application as a PWA with the capability to use offline storage for pilets, too.

By default, these API extensions are not integrated in piral, so you'd need to add them to your Piral instance.

Why and When

A progressive web app (PWA) is the next step in the evolution of web applications. Quite naturally, a microfrontend solution should also be capable of being turned into a PWA. To use some of the PWA capabilities from pilets without further checks the pilet API has been extended with some PWA specific functions. The most important part of this plugin, however, is to fully integrate the ServiceWorker into the app shell.

Alternatives: Set up a ServiceWorker yourself or use a known library (e.g., WorkBox) or bundler plugin to do this for you.

Documentation

The following functions are brought to the Pilet API.

`showAppNotification()`

Allows pilets to present a "native" notification. The exact looks of this are platform dependent, e.g., on Chrome for Windows 10 an item as added to the notification bar. On Chrome for MacOS X a quick notification appears.

Usage

::: summary: For pilet authors

You can use the showAppNotification function from the Pilet API to show a native notification in the host browser or operating system from the Piral instance.

Example use:

import { PiletApi } from '<name-of-piral-instance>';

export function setup(piral: PiletApi) {
  piral.showAppNotification('Pilet started!', {
    body: 'The sample pilet was successfully set up...',
  });
}

:::

::: summary: For Piral instance developers

The provided library only brings API extensions for pilets to a Piral instance.

In order to get your Progressive Web App correctly running you'll also need a manifest.webmanifest file. You can locate it next to your index.html file.

The content of manifest.webmanifest can be as simple as:

{
  "name": "Example App",
  "short_name": "ExApp",
  "theme_color": "#2196f3",
  "background_color": "#2196f3",
  "display": "standalone",
  "scope": "/",
  "start_url": "/",
  "icons": [
    {
      "src": "images/icon-144x144.png",
      "sizes": "144x144",
      "type": "image/png"
    }
  ]
}

Note: You'll need at least a 144x144 pixels sized icon. This is not a requirement of piral-pwa, but rather of how PWAs work.

The manifest.webmanifest needs to be referenced by your index.html file. If both files are adjacent this can be done with the following code:

<link rel="manifest" href="./manifest.webmanifest">

For the setup of the library itself you'll need to import createPwaApi from the piral-pwa package.

import { createPwaApi } from 'piral-pwa';

The integration looks like:

const instance = createInstance({
  // important part
  plugins: [createPwaApi()],
  // ...
});

Customizing the Service Worker

By default, a service worker is generated for you. This behavior can be overridden if you place a file called sw.js in your src folder.

The server worker file is automatically enhanced with the following template variables:

__PARAMS__, defines general parameters such as the responseStrategy or the URLs from externals to consider
__HELPERS__, defines the cacheMaps for setting up the caching strategy and the navigationPreload property
__DEBUG__, which is either true or false depending on the runtime mode

You don't need to use them, but they can be quite helpful. For instance, on __PARAMS__, you'll find the fields for name and version of your app.

Remark: How the parameters and helpers can be influenced (i.e., configured) is currently work in progress and should be figured out until v1.

Configuration of the Provided Options

The parameters for the generated service worker can be configured, too. All in all this follows the options known from Webpack's offline-plugin, see options for explanations.

In a nutshell, in order to use the options you'll need a file called .pwarc in the root directory of your application (i.e., next to your package.json).

The .pwarc may look as follows:

{
  updateStrategy: 'all',
  responseStrategy: 'network-first',
  externals: ['https://api.myhost.com/logo.png', '/static/image.jpg'],
  excludes: ['**/.*', '**/*.map', '**/*.gz'],
  cacheMaps: [],
  navigationPreload: false,
  caches: 'all',
}

More details on the configuration will follow. Further options will be integrated soon, too.

:::

License

Piral is released using the MIT license. For more information see the license file.

piral pilet-api smapiot portal modules api plugin plugin-content pwa progressive app

@infinitebrahmanuniverse/nolb-pir @everything-registry/sub-chunk-2440

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