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node_modules/firebase-functions/lib/common/change.d.ts

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+/**
+ * `ChangeJson` is the JSON format used to construct a `Change` object.
+ */
+export interface ChangeJson {
+    /**
+     * Key-value pairs representing state of data after the change.
+     */
+    after?: any;
+    /**
+     * Key-value pairs representing state of data before the change. If
+     * `fieldMask` is set, then only fields that changed are present in `before`.
+     */
+    before?: any;
+    /**
+     * Comma-separated string that represents names of fields that changed.
+     */
+    fieldMask?: string;
+}
+/**
+ * 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
+ * {@link ChangeJson} below.
+ *
+ */
+export declare class Change<T> {
+    before: T;
+    after: T;
+    /**
+     * Factory method for creating a `Change` from a `before` object and an `after`
+     * object.
+     */
+    static fromObjects<T>(before: T, after: T): Change<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.
+     */
+    static fromJSON<T>(json: ChangeJson, customizer?: (x: any) => T): Change<T>;
+    constructor(before: T, after: T);
+}