[no-array-method-this-argument] False positive on non array object but has `map` method

export interface ErrorMapperInterface {
  /**
   * Maps an error to a string.
   * @param {string} key the error key. i.e., required, etc
   * @param error the error object
   * @param control control Object (AbstractControl for Angular, NgModel for AngularJS)
   * @returns {string}
   */
  map(key: string, error?: any, control?: any): string;
}

declare const mapper: ErrorMapperInterface

mapperService.map(firstError, errors[firstError])

[JounQin]

When @typescript-eslint/eslint-parser is used, we should know whether mapperService is a true array.

[fisker]

Sure.