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declare var ajv: {
  (options?: ajv.Options): ajv.Ajv;
  new(options?: ajv.Options): ajv.Ajv;
  ValidationError: typeof AjvErrors.ValidationError;
  MissingRefError: typeof AjvErrors.MissingRefError;
  $dataMetaSchema: object;
}

declare namespace AjvErrors {
  class ValidationError extends Error {
    constructor(errors: Array<ajv.ErrorObject>);

    message: string;
    errors: Array<ajv.ErrorObject>;
    ajv: true;
    validation: true;
  }

  class MissingRefError extends Error {
    constructor(baseId: string, ref: string, message?: string);
    static message: (baseId: string, ref: string) => string;

    message: string;
    missingRef: string;
    missingSchema: string;
  }
}

declare namespace ajv {
  type ValidationError = AjvErrors.ValidationError;

  type MissingRefError = AjvErrors.MissingRefError;

  interface Ajv {
    /**
    * Validate data using schema
    * Schema will be compiled and cached (using serialized JSON as key, [fast-json-stable-stringify](https://github.com/epoberezkin/fast-json-stable-stringify) is used to serialize by default).
    * @param  {string|object|Boolean} schemaKeyRef key, ref or schema object
    * @param  {Any} data to be validated
    * @return {Boolean} validation result. Errors from the last validation will be available in `ajv.errors` (and also in compiled schema: `schema.errors`).
    */
    validate(schemaKeyRef: object | string | boolean, data: any): boolean | PromiseLike<any>;
    /**
    * Create validating function for passed schema.
    * @param  {object|Boolean} schema schema object
    * @return {Function} validating function
    */
    compile(schema: object | boolean): ValidateFunction;
    /**
    * Creates validating function for passed schema with asynchronous loading of missing schemas.
    * `loadSchema` option should be a function that accepts schema uri and node-style callback.
    * @this  Ajv
    * @param {object|Boolean} schema schema object
    * @param {Boolean} meta optional true to compile meta-schema; this parameter can be skipped
    * @param {Function} callback optional node-style callback, it is always called with 2 parameters: error (or null) and validating function.
    * @return {PromiseLike<ValidateFunction>} validating function
    */
    compileAsync(schema: object | boolean, meta?: Boolean, callback?: (err: Error, validate: ValidateFunction) => any): PromiseLike<ValidateFunction>;
    /**
    * Adds schema to the instance.
    * @param {object|Array} schema schema or array of schemas. If array is passed, `key` and other parameters will be ignored.
    * @param {string} key Optional schema key. Can be passed to `validate` method instead of schema object or id/ref. One schema per instance can have empty `id` and `key`.
    * @return {Ajv} this for method chaining
    */
    addSchema(schema: Array<object> | object, key?: string): Ajv;
    /**
    * Add schema that will be used to validate other schemas
    * options in META_IGNORE_OPTIONS are alway set to false
    * @param {object} schema schema object
    * @param {string} key optional schema key
    * @return {Ajv} this for method chaining
    */
    addMetaSchema(schema: object, key?: string): Ajv;
    /**
    * Validate schema
    * @param {object|Boolean} schema schema to validate
    * @return {Boolean} true if schema is valid
    */
    validateSchema(schema: object | boolean): boolean;
    /**
    * Get compiled schema from the instance by `key` or `ref`.
    * @param  {string} keyRef `key` that was passed to `addSchema` or full schema reference (`schema.id` or resolved id).
    * @return {Function} schema validating function (with property `schema`). Returns undefined if keyRef can't be resolved to an existing schema.
    */
    getSchema(keyRef: string): ValidateFunction | undefined;
    /**
    * Remove cached schema(s).
    * If no parameter is passed all schemas but meta-schemas are removed.
    * If RegExp is passed all schemas with key/id matching pattern but meta-schemas are removed.
    * Even if schema is referenced by other schemas it still can be removed as other schemas have local references.
    * @param  {string|object|RegExp|Boolean} schemaKeyRef key, ref, pattern to match key/ref or schema object
    * @return {Ajv} this for method chaining
    */
    removeSchema(schemaKeyRef?: object | string | RegExp | boolean): Ajv;
    /**
    * Add custom format
    * @param {string} name format name
    * @param {string|RegExp|Function} format string is converted to RegExp; function should return boolean (true when valid)
    * @return {Ajv} this for method chaining
    */
    addFormat(name: string, format: FormatValidator | FormatDefinition): Ajv;
    /**
    * Define custom keyword
    * @this  Ajv
    * @param {string} keyword custom keyword, should be a valid identifier, should be different from all standard, custom and macro keywords.
    * @param {object} definition keyword definition object with properties `type` (type(s) which the keyword applies to), `validate` or `compile`.
    * @return {Ajv} this for method chaining
    */
    addKeyword(keyword: string, definition: KeywordDefinition): Ajv;
    /**
    * Get keyword definition
    * @this  Ajv
    * @param {string} keyword pre-defined or custom keyword.
    * @return {object|Boolean} custom keyword definition, `true` if it is a predefined keyword, `false` otherwise.
    */
    getKeyword(keyword: string): object | boolean;
    /**
    * Remove keyword
    * @this  Ajv
    * @param {string} keyword pre-defined or custom keyword.
    * @return {Ajv} this for method chaining
    */
    removeKeyword(keyword: string): Ajv;
    /**
    * Validate keyword
    * @this  Ajv
    * @param {object} definition keyword definition object
    * @param {boolean} throwError true to throw exception if definition is invalid
    * @return {boolean} validation result
    */
    validateKeyword(definition: KeywordDefinition, throwError: boolean): boolean;
    /**
    * Convert array of error message objects to string
    * @param  {Array<object>} errors optional array of validation errors, if not passed errors from the instance are used.
    * @param  {object} options optional options with properties `separator` and `dataVar`.
    * @return {string} human readable string with all errors descriptions
    */
    errorsText(errors?: Array<ErrorObject> | null, options?: ErrorsTextOptions): string;
    errors?: Array<ErrorObject> | null;
    _opts: Options;
  }

  interface CustomLogger {
    log(...args: any[]): any;
    warn(...args: any[]): any;
    error(...args: any[]): any;
  }

  interface ValidateFunction {
    (
      data: any,
      dataPath?: string,
      parentData?: object | Array<any>,
      parentDataProperty?: string | number,
      rootData?: object | Array<any>
    ): boolean | PromiseLike<any>;
    schema?: object | boolean;
    errors?: null | Array<ErrorObject>;
    refs?: object;
    refVal?: Array<any>;
    root?: ValidateFunction | object;
    $async?: true;
    source?: object;
  }

  interface Options {
    $data?: boolean;
    allErrors?: boolean;
    verbose?: boolean;
    jsonPointers?: boolean;
    uniqueItems?: boolean;
    unicode?: boolean;
    format?: false | string;
    formats?: object;
    keywords?: object;
    unknownFormats?: true | string[] | 'ignore';
    schemas?: Array<object> | object;
    schemaId?: '$id' | 'id' | 'auto';
    missingRefs?: true | 'ignore' | 'fail';
    extendRefs?: true | 'ignore' | 'fail';
    loadSchema?: (uri: string, cb?: (err: Error, schema: object) => void) => PromiseLike<object | boolean>;
    removeAdditional?: boolean | 'all' | 'failing';
    useDefaults?: boolean | 'empty' | 'shared';
    coerceTypes?: boolean | 'array';
    strictDefaults?: boolean | 'log';
    strictKeywords?: boolean | 'log';
    strictNumbers?: boolean;
    async?: boolean | string;
    transpile?: string | ((code: string) => string);
    meta?: boolean | object;
    validateSchema?: boolean | 'log';
    addUsedSchema?: boolean;
    inlineRefs?: boolean | number;
    passContext?: boolean;
    loopRequired?: number;
    ownProperties?: boolean;
    multipleOfPrecision?: boolean | number;
    errorDataPath?: string,
    messages?: boolean;
    sourceCode?: boolean;
    processCode?: (code: string, schema: object) => string;
    cache?: object;
    logger?: CustomLogger | false;
    nullable?: boolean;
    serialize?: ((schema: object | boolean) => any) | false;
  }

  type FormatValidator = string | RegExp | ((data: string) => boolean | PromiseLike<any>);
  type NumberFormatValidator = ((data: number) => boolean | PromiseLike<any>);

  interface NumberFormatDefinition {
    type: "number",
    validate: NumberFormatValidator;
    compare?: (data1: number, data2: number) => number;
    async?: boolean;
  }

  interface StringFormatDefinition {
    type?: "string",
    validate: FormatValidator;
    compare?: (data1: string, data2: string) => number;
    async?: boolean;
  }

  type FormatDefinition = NumberFormatDefinition | StringFormatDefinition;

  interface KeywordDefinition {
    type?: string | Array<string>;
    async?: boolean;
    $data?: boolean;
    errors?: boolean | string;
    metaSchema?: object;
    // schema: false makes validate not to expect schema (ValidateFunction)
    schema?: boolean;
    statements?: boolean;
    dependencies?: Array<string>;
    modifying?: boolean;
    valid?: boolean;
    // one and only one of the following properties should be present
    validate?: SchemaValidateFunction | ValidateFunction;
    compile?: (schema: any, parentSchema: object, it: CompilationContext) => ValidateFunction;
    macro?: (schema: any, parentSchema: object, it: CompilationContext) => object | boolean;
    inline?: (it: CompilationContext, keyword: string, schema: any, parentSchema: object) => string;
  }

  interface CompilationContext {
    level: number;
    dataLevel: number;
    dataPathArr: string[];
    schema: any;
    schemaPath: string;
    baseId: string;
    async: boolean;
    opts: Options;
    formats: {
      [index: string]: FormatDefinition | undefined;
    };
    keywords: {
      [index: string]: KeywordDefinition | undefined;
    };
    compositeRule: boolean;
    validate: (schema: object) => boolean;
    util: {
      copy(obj: any, target?: any): any;
      toHash(source: string[]): { [index: string]: true | undefined };
      equal(obj: any, target: any): boolean;
      getProperty(str: string): string;
      schemaHasRules(schema: object, rules: any): string;
      escapeQuotes(str: string): string;
      toQuotedString(str: string): string;
      getData(jsonPointer: string, dataLevel: number, paths: string[]): string;
      escapeJsonPointer(str: string): string;
      unescapeJsonPointer(str: string): string;
      escapeFragment(str: string): string;
      unescapeFragment(str: string): string;
    };
    self: Ajv;
  }

  interface SchemaValidateFunction {
    (
      schema: any,
      data: any,
      parentSchema?: object,
      dataPath?: string,
      parentData?: object | Array<any>,
      parentDataProperty?: string | number,
      rootData?: object | Array<any>
    ): boolean | PromiseLike<any>;
    errors?: Array<ErrorObject>;
  }

  interface ErrorsTextOptions {
    separator?: string;
    dataVar?: string;
  }

  interface ErrorObject {
    keyword: string;
    dataPath: string;
    schemaPath: string;
    params: ErrorParameters;
    // Added to validation errors of propertyNames keyword schema
    propertyName?: string;
    // Excluded if messages set to false.
    message?: string;
    // These are added with the `verbose` option.
    schema?: any;
    parentSchema?: object;
    data?: any;
  }

  type ErrorParameters = RefParams | LimitParams | AdditionalPropertiesParams |
    DependenciesParams | FormatParams | ComparisonParams |
    MultipleOfParams | PatternParams | RequiredParams |
    TypeParams | UniqueItemsParams | CustomParams |
    PatternRequiredParams | PropertyNamesParams |
    IfParams | SwitchParams | NoParams | EnumParams;

  interface RefParams {
    ref: string;
  }

  interface LimitParams {
    limit: number;
  }

  interface AdditionalPropertiesParams {
    additionalProperty: string;
  }

  interface DependenciesParams {
    property: string;
    missingProperty: string;
    depsCount: number;
    deps: string;
  }

  interface FormatParams {
    format: string
  }

  interface ComparisonParams {
    comparison: string;
    limit: number | string;
    exclusive: boolean;
  }

  interface MultipleOfParams {
    multipleOf: number;
  }

  interface PatternParams {
    pattern: string;
  }

  interface RequiredParams {
    missingProperty: string;
  }

  interface TypeParams {
    type: string;
  }

  interface UniqueItemsParams {
    i: number;
    j: number;
  }

  interface CustomParams {
    keyword: string;
  }

  interface PatternRequiredParams {
    missingPattern: string;
  }

  interface PropertyNamesParams {
    propertyName: string;
  }

  interface IfParams {
    failingKeyword: string;
  }

  interface SwitchParams {
    caseIndex: number;
  }

  interface NoParams { }

  interface EnumParams {
    allowedValues: Array<any>;
  }
}

export = ajv;