/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @fileoverview Standardized Firebase Error.
 *
 * Usage:
 *
 *   // Typescript string literals for type-safe codes
 *   type Err =
 *     'unknown' |
 *     'object-not-found'
 *     ;
 *
 *   // Closure enum for type-safe error codes
 *   // at-enum {string}
 *   var Err = {
 *     UNKNOWN: 'unknown',
 *     OBJECT_NOT_FOUND: 'object-not-found',
 *   }
 *
 *   let errors: Map<Err, string> = {
 *     'generic-error': "Unknown error",
 *     'file-not-found': "Could not find file: {$file}",
 *   };
 *
 *   // Type-safe function - must pass a valid error code as param.
 *   let error = new ErrorFactory<Err>('service', 'Service', errors);
 *
 *   ...
 *   throw error.create(Err.GENERIC);
 *   ...
 *   throw error.create(Err.FILE_NOT_FOUND, {'file': fileName});
 *   ...
 *   // Service: Could not file file: foo.txt (service/file-not-found).
 *
 *   catch (e) {
 *     assert(e.message === "Could not find file: foo.txt.");
 *     if ((e as FirebaseError)?.code === 'service/file-not-found') {
 *       console.log("Could not read file: " + e['file']);
 *     }
 *   }
 */
export declare type ErrorMap<ErrorCode extends string> = {
    readonly [K in ErrorCode]: string;
};
export interface StringLike {
    toString(): string;
}
export interface ErrorData {
    [key: string]: unknown;
}
export declare class FirebaseError extends Error {
    /** The error code for this error. */
    readonly code: string;
    /** Custom data for this error. */
    customData?: Record<string, unknown> | undefined;
    /** The custom name for all FirebaseErrors. */
    readonly name: string;
    constructor(
    /** The error code for this error. */
    code: string, message: string, 
    /** Custom data for this error. */
    customData?: Record<string, unknown> | undefined);
}
export declare class ErrorFactory<ErrorCode extends string, ErrorParams extends {
    readonly [K in ErrorCode]?: ErrorData;
} = {}> {
    private readonly service;
    private readonly serviceName;
    private readonly errors;
    constructor(service: string, serviceName: string, errors: ErrorMap<ErrorCode>);
    create<K extends ErrorCode>(code: K, ...data: K extends keyof ErrorParams ? [ErrorParams[K]] : []): FirebaseError;
}