Use the async pipe on an observable in Angular

I had this online/offline observable and I needed it on my component. This was the snippet I used to show things dependent on my online/offline state.

Angular
TypeScript

NG8002: Can't bind to x since it isn't a known property of 'app-my-component'.

Angular
TypeScript

error TS2532: Object is possibly 'undefined'.

TypeScript

Error: TS2564: Property has no initializer and is not definitely assigned in the constructor.

TypeScript

error TS7006: Parameter 'db' implicitly has an 'any' type.

TypeScript

Fix error in styles.scss class does not exist. Module build failed (from ./node_modules/postcss-loader/dist/cjs.js):

TypeScript
Tailwind
Angular

Fix Ngx-translate pipe not found in Angular 11 error [solved]

TypeScript
Angular

TS2339: Property 'fromEvent' does not exist on type 'typeof Observable'.

TypeScript
Angular

[solved] No suitable injection token for parameter 'connectionChanged' of class 'OnlineOfflineServic e'.

TypeScript
Angular

error TS2538: Type 'undefined' cannot be used as an index type.

TypeScript
Angular

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