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Showing content from https://firebase.google.com/docs/reference/functions/firebase-functions.firestore.documentbuilder below:

firestore.DocumentBuilder class | Cloud Functions for Firebase

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Signature:

export declare class DocumentBuilder<Path extends string> 

Constructs a new instance of the DocumentBuilder class

Signature:

constructor(triggerResource: () => string, options: DeploymentOptions);

Respond only to document creations.

Signature:

onCreate(handler: (snapshot: QueryDocumentSnapshot, context: EventContext<ParamsOf<Path>>) => PromiseLike<any> | any): CloudFunction<QueryDocumentSnapshot>;

Returns:

CloudFunction<QueryDocumentSnapshot>

Respond only to document deletions.

Signature:

onDelete(handler: (snapshot: QueryDocumentSnapshot, context: EventContext<ParamsOf<Path>>) => PromiseLike<any> | any): CloudFunction<QueryDocumentSnapshot>;

Returns:

CloudFunction<QueryDocumentSnapshot>

Respond only to document updates.

Signature:

onUpdate(handler: (change: Change<QueryDocumentSnapshot>, context: EventContext<ParamsOf<Path>>) => PromiseLike<any> | any): CloudFunction<Change<QueryDocumentSnapshot>>;

Returns:

CloudFunction<Change<QueryDocumentSnapshot>>

Respond to all document writes (creates, updates, or deletes).

Signature:

onWrite(handler: (change: Change<DocumentSnapshot>, context: EventContext<ParamsOf<Path>>) => PromiseLike<any> | any): CloudFunction<Change<DocumentSnapshot>>;

Returns:

CloudFunction<Change<DocumentSnapshot>>

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Last updated 2023-04-24 UTC.

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