Utilizing TypeScript for enhanced Chrome notifications

I am currently developing a Chrome app using TypeScript (Angular2) and I want to implement push notifications. Here is the code snippet for my notification service:

import {Injectable} from 'angular2/core';

@Injectable()
export class NotificationService {
    constructor() {
        if(Notification.permission !== 'granted') {
            Notification.requestPermission();
        }
    }
}

During the gulp build process, I encountered this error message:

src/scripts/stream/notification.service.ts(6) Cannot find name 'Notification'.

I attempted to use the /* tslint:disable */ comment syntax around my class, but it did not resolve the issue.

Is there a way to define 'Notification' as a global variable in the tslint.json file?

In jshint, the configuration would look something like this:

"globals": {
   "Notification": false
}

Answer №1

There are a couple of ways to tackle this issue:

  1. To resolve the transpiler error, consider adding the following line at the beginning of your file.

    declare var Notification: any;

    Although this will allow the transpiler to pass, it may limit some of TypeScript's capabilities.

  2. Alternatively, you can opt to download the definition type (chrome.d.ts).

    TSD is a popular choice for managing definitions.
    Typings is also a promising alternative.

Answer №2

If you need a generic typing file, you can find one in this GitHub TypeScript issue;

To utilize it, create a new file named notification.d.ts and insert the provided code.

type NotificationPermission = "default" | "denied" | "granted";

type NotificationDirection = "auto" | "ltr" | "rtl";

interface NotificationPermissionCallback {
    (permission: NotificationPermission): void;
}

// More interface definitions...

declare class Notification extends EventTarget {
    constructor(title: string, options?: NotificationOptions);

    // Static members and methods...
    
    onclick: EventListenerOrEventListenerObject;
    onerror: EventListenerOrEventListenerObject;

    close(): void;

    readonly title: string;
    readonly dir: NotificationDirection;
    readonly lang: string;
    // More readonly properties...

}

Remember to include the typings file in your project's tsconfig.json file;

    "typeRoots": [
        "typings/notification.d.ts"
    ]

Once added, you will have access to the Notification functionality.

Answer №3

If your project is missing the typing definitions for Chrome, you can easily install them using the handy tsd tool.

To get started, begin by installing tsd on your system:

$ npm install tsd -g

Once tsd is set up, you can proceed to install the type definitions specific to Chrome within your project:

$ tsd install chrome

More detailed information about tsd can be found at this link.

Remember: it's important to ensure that you have a single tsd file defined for each library in use.

Answer №4

While the d.ts files for the Notifications API remain elusive, I have discovered a clever workaround.

if ("Notification" in window) {
    let _Notification = window["Notification"];
}

_Notification will mirror the properties of Notification and can be utilized in the same manner. This simple hack bypasses any TypeScript errors that may arise.

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