declare module 'ember-concurrency' {
  import RSVP from 'rsvp';
  import EmberObject from '@ember/object';
  import {
    UnwrapComputedPropertyGetter,
    UnwrapComputedPropertyGetters
  } from '@ember/object/-private/types';

  // Lifted from @types/ember__object/observable.d.ts
  interface Getter {
    /**
     * Retrieves the value of a property from the object.
     */
    get<K extends keyof this>(key: K): UnwrapComputedPropertyGetter<this[K]>;
    /**
     * To get the values of multiple properties at once, call `getProperties`
     * with a list of strings or an array:
     */
    getProperties<K extends keyof this>(
      list: K[]
    ): Pick<UnwrapComputedPropertyGetters<this>, K>;
    getProperties<K extends keyof this>(
      ...list: K[]
    ): Pick<UnwrapComputedPropertyGetters<this>, K>;
  }

  type GeneratorFn<Args extends any[] = any[], R = any> = (
    ...args: Args
  ) => IterableIterator<R>;

  export const all: typeof Promise.all;
  export const allSettled: typeof RSVP.allSettled;
  export const hash: typeof RSVP.hash;
  export const race: typeof Promise.race;

  export function timeout(ms: number): Promise<void>;

  export function waitForEvent(
    object: EmberObject | EventTarget,
    eventName: string
  ): Promise<Event>;

  export function waitForProperty<T extends object, K extends keyof T>(
    object: T,
    key: K,
    callbackOrValue: (value: T[K]) => boolean
  ): Promise<void>;

  export function waitForQueue(queueName: string): Promise<void>;

  export function task<Args extends any[], R>(
    task: GeneratorFn<Args, R>
  ): Task<Args, Exclude<R, Promise<any>>>;

  export function taskGroup(): TaskGroupProperty;

  interface CommonTaskProperty {
    restartable: () => TaskProperty;
    drop: () => TaskProperty;
    keepLatest: () => TaskProperty;
    enqueue: () => TaskProperty;
    maxConcurrency: (n: number) => TaskProperty;
    cancelOn: (eventName: string) => TaskProperty;
    group: (groupName: string) => TaskProperty;
  }

  export interface TaskProperty extends CommonTaskProperty {
    evented: () => TaskProperty;
    debug: () => TaskProperty;
    on: (eventName: string) => TaskProperty;
  }

  // eslint-disable-next-line @typescript-eslint/no-empty-interface
  export interface TaskGroupProperty extends CommonTaskProperty {}

  // Based on https://github.com/CenterForOpenScience/ember-osf-web/blob/7933316efae805e00723789809bdeb58a96a286a/types/ember-concurrency/index.d.ts

  export enum TaskInstanceState {
    Dropped = 'dropped',
    Canceled = 'canceled',
    Finished = 'finished',
    Running = 'running',
    Waiting = 'waiting'
  }

  export interface TaskInstance<T> extends PromiseLike<T>, Getter {
    readonly error?: unknown;
    readonly hasStarted: boolean;
    readonly isCanceled: boolean;
    readonly isDropped: boolean;
    readonly isError: boolean;
    readonly isFinished: boolean;
    readonly isRunning: boolean;
    readonly isSuccessful: boolean;
    readonly state: TaskInstanceState;
    readonly value?: T;
    cancel(): void;
    catch(): RSVP.Promise<unknown>;
    finally(): RSVP.Promise<unknown>;
    then<TResult1 = T, TResult2 = never>(
      onfulfilled?:
        | ((value: T) => TResult1 | RSVP.Promise<TResult1>)
        | undefined
        | null,
      onrejected?:
        | ((reason: any) => TResult2 | PromiseLike<TResult2>)
        | undefined
        | null
    ): RSVP.Promise<TResult1 | TResult2>;
  }

  export enum TaskState {
    Running = 'running',
    Queued = 'queued',
    Idle = 'idle'
  }

  export interface Task<Args extends any[], T> extends Getter {
    readonly isIdle: boolean;
    readonly isQueued: boolean;
    readonly isRunning: boolean;
    readonly last?: TaskInstance<T>;
    readonly lastCanceled?: TaskInstance<T>;
    readonly lastComplete?: TaskInstance<T>;
    readonly lastErrored?: TaskInstance<T>;
    readonly lastIncomplete?: TaskInstance<T>;
    readonly lastPerformed?: TaskInstance<T>;
    readonly lastRunning?: TaskInstance<T>;
    readonly lastSuccessful?: TaskInstance<T>;
    readonly performCount: number;
    readonly state: TaskState;
    perform(...args: Args): TaskInstance<T>;
    cancelAll(): void;
  }
}