import type { firestore } from 'firebase-admin';
import type { BatchCallback, MigrationPredicate, MigrationResult, SetDataGetter, SetOptions, SetPartialDataGetter, Traverser, UpdateDataGetter, UpdateFieldValueGetter } from '.';
/**
 * Represents the general interface of a migrator.
 */
export interface Migrator<D = firestore.DocumentData> {
    /**
     * The underlying traverser.
     */
    readonly traverser: Traverser<D>;
    /**
     * Applies a migration predicate that indicates whether to migrate the current document or not. By default, all
     * documents are migrated.
     *
     * @remarks
     *
     * If you have already applied other migration predicates to this migrator, this and all the other predicates will be
     * evaluated and the resulting booleans will be AND'd to get the boolean that indicates whether to migrate the document
     * or not. This is consistent with the intuitive default behavior that all documents are migrated.
     *
     * @example
     *
     * ```ts
     * const newMigrator = migrator
     *   .withPredicate((doc) => doc.get('name') !== undefined)
     *   .withPredicate((doc) => doc.ref.path.startsWith('users/'));
     * ```
     *
     * In the above case `newMigrator` will migrate only the documents whose `name` field is not missing AND whose path
     * starts with `"users/"`.
     *
     * @param predicate - A function that takes a document snapshot and returns a boolean indicating whether to migrate it.
     * @returns A new {@link Migrator} object.
     */
    withPredicate(predicate: MigrationPredicate<D>): Migrator<D>;
    /**
     * Applies a new traverser that will be used by the migrator.
     *
     * @param traverser - The new traverser that the migrator will use.
     * @returns A new {@link Migrator} object.
     */
    withTraverser(traverser: Traverser<D>): Migrator<D>;
    /**
     * Registers a callback function that fires right before a batch starts processing. You can register at most 1
     * callback. If you call this function multiple times, only the last callback will be registered.
     *
     * @param callback - A synchronous callback that takes batch doc snapshots and the 0-based batch index as its arguments.
     */
    onBeforeBatchStart(callback: BatchCallback<D>): void;
    /**
     * Registers a callback function that fires after a batch is processed. You can register at most 1 callback. If you call
     * this function multiple times, only the last callback will be registered.
     *
     * @param callback - A synchronous callback that takes batch doc snapshots and the 0-based batch index as its arguments.
     */
    onAfterBatchComplete(callback: BatchCallback<D>): void;
    /**
     * Deletes the specified field from all documents in this collection.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param field - The field to delete.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    deleteField(field: string | firestore.FieldPath): Promise<MigrationResult>;
    /**
     * Deletes the specified fields from all documents in this collection.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @example
     *
     * ```ts
     * const field1 = new firestore.FieldPath('name', 'last');
     * const field2 = 'lastModifiedAt';
     * await migrator.deleteFields(field1, field2);
     * ```
     *
     * @param fields - A list of fields to delete.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    deleteFields(...fields: (string | firestore.FieldPath)[]): Promise<MigrationResult>;
    /**
     * Renames the specified field in all documents in this collection. Ignores the fields that are missing.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param oldField - The old field.
     * @param newField - The new field.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    renameField(oldField: string | firestore.FieldPath, newField: string | firestore.FieldPath): Promise<MigrationResult>;
    /**
     * Renames the specified fields in all documents in this collection. Ignores the fields that are missing.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @example
     *
     * ```ts
     * const change1 = [new firestore.FieldPath('name', 'last'), 'lastName'];
     * const change2 = ['lastModifiedAt', 'lastUpdatedAt'];
     * await migrator.renameFields(change1, change2);
     * ```
     *
     * @param changes - A list of `[oldField, newField]` tuples. Each tuple is an array of 2 elements:
     * the old field to rename and the new field.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    renameFields(...changes: [oldField: string | firestore.FieldPath, newField: string | firestore.FieldPath][]): Promise<MigrationResult>;
    /**
     * Sets all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param data - A data object with which to set each document.
     * @param options - An object to configure the set behavior.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    set(data: firestore.PartialWithFieldValue<D>, options: SetOptions): Promise<MigrationResult>;
    /**
     * Sets all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param data - A data object with which to set each document.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    set(data: firestore.WithFieldValue<D>): Promise<MigrationResult>;
    /**
     * Sets all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param getData - A function that takes a document snapshot and returns a data object with
     * which to set each document.
     * @param options - An object to configure the set behavior.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    setWithDerivedData(getData: SetPartialDataGetter<D>, options: SetOptions): Promise<MigrationResult>;
    /**
     * Sets all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param getData - A function that takes a document snapshot and returns a data object with
     * which to set each document.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    setWithDerivedData(getData: SetDataGetter<D>): Promise<MigrationResult>;
    /**
     * Updates all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param data - A non-empty data object with which to update each document.
     * @param precondition - A Precondition to enforce on this update.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    update(data: firestore.UpdateData<D>, precondition?: firestore.Precondition): Promise<MigrationResult>;
    /**
     * Updates all documents in this collection with the provided field-value pair.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param field - The first field to update in each document.
     * @param value - The first value corresponding to the first field. Must not be `undefined`.
     * @param moreFieldsOrPrecondition - An alternating list of field paths and values to update,
     * optionally followed by a Precondition to enforce on this update.
     *
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    update(field: string | firestore.FieldPath, value: any, ...moreFieldsOrPrecondition: any[]): Promise<MigrationResult>;
    /**
     * Updates all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param getData - A function that takes a document snapshot and returns a non-empty data object with
     * which to update each document.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    updateWithDerivedData(getData: UpdateDataGetter<D>, precondition?: firestore.Precondition): Promise<MigrationResult>;
    /**
     * Updates all documents in this collection with the provided data.
     *
     * @remarks
     *
     * **Complexity:**
     *
     * - Time complexity: _TC_(`traverser`) where _C_(`batchSize`) = _W_(`batchSize`)
     * - Space complexity: _SC_(`traverser`) where _S_ = _O_(`batchSize`)
     * - Billing: _max_(1, _N_) reads, _K_ writes
     *
     * where:
     *
     * - _N_: number of docs in the traversable
     * - _K_: number of docs that passed the migration predicate (_K_<=_N_)
     * - _W_(`batchSize`): average batch write time
     * - _TC_(`traverser`): time complexity of the underlying traverser
     * - _SC_(`traverser`): space complexity of the underlying traverser
     *
     * @param getData - A function that takes a document snapshot and returns an alternating list of field
     * paths and values to update, optionally followed by a Precondition to enforce on this update.
     * @returns A Promise resolving to an object representing the details of the migration.
     */
    updateWithDerivedData(getData: UpdateFieldValueGetter<D>): Promise<MigrationResult>;
}