Change class
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The Cloud Functions interface for events that change state, such as Realtime Database or Cloud Firestore onWrite and onUpdate events.

For more information about the format used to construct Change objects, see below.

Signature:

export declare class Change<T>

Constructors

Constructor	Modifiers	Description
(constructor)(before, after)		Constructs a new instance of the `Change` class

Property	Modifiers	Type	Description
after		T
before		T

Method	Modifiers	Description
fromJSON(json, customizer)	`static`	Factory method for creating a `Change` from JSON and an optional customizer function to be applied to both the `before` and the `after` fields.
fromObjects(before, after)	`static`	Factory method for creating a `Change` from a `before` object and an `after` object.

Constructs a new instance of the Change class

Signature:

constructor(before: T, after: T);

Parameter	Type	Description
before	T
after	T

Signature:

after: T;

Signature:

before: T;

Factory method for creating a Change from JSON and an optional customizer function to be applied to both the before and the after fields.

Signature:

static fromJSON<T>(json: ChangeJson, customizer?: (x: any) => T): Change<T>;

Parameter	Type	Description
json	ChangeJson
customizer	(x: any) => T

Returns:

Change<T>

Factory method for creating a Change from a before object and an after object.

Signature:

static fromObjects<T>(before: T, after: T): Change<T>;

Parameter	Type	Description
before	T
after	T

Returns:

Change<T>