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/**
 * This file provides type definitions for use with the Flow type checker.
 *
 * An important caveat when using these definitions is that the types for
 * `Collection.Keyed`, `Collection.Indexed`, `Seq.Keyed`, and so on are stubs.
 * When referring to those types, you can get the proper definitions by
 * importing the types `KeyedCollection`, `IndexedCollection`, `KeyedSeq`, etc.
 * For example,
 *
 *     import { Seq } from 'immutable'
 *     import type { IndexedCollection, IndexedSeq } from 'immutable'
 *
 *     const someSeq: IndexedSeq<number> = Seq.Indexed.of(1, 2, 3)
 *
 *     function takesASeq<T, TS: IndexedCollection<T>>(iter: TS): TS {
 *       return iter.butLast()
 *     }
 *
 *     takesASeq(someSeq)
 *
 * @flow strict
 */

// Helper type that represents plain objects allowed as arguments to
// some constructors and functions.
type PlainObjInput<K, V> = { +[key: K]: V, __proto__: null };

type K<T> = $Keys<T>;

// Helper types to extract the "keys" and "values" use by the *In() methods.
type $KeyOf<C> = $Call<
  (<K>(?_Collection<K, mixed>) => K) &
    (<T>(?$ReadOnlyArray<T>) => number) &
    (<T>(?RecordInstance<T> | T) => $Keys<T>) &
    (<T: Object>(T) => $Keys<T>),
  C
>;

type $ValOf<C, K = $KeyOf<C>> = $Call<
  (<V>(?_Collection<any, V>) => V) &
    (<T>(?$ReadOnlyArray<T>) => T) &
    (<T, K: $Keys<T>>(?RecordInstance<T> | T, K) => $ElementType<T, K>) &
    (<T: Object>(T) => $Values<T>),
  C,
  K
>;

type $IterableOf<C> = $Call<
  (<V: Array<any> | IndexedCollection<any> | SetCollection<any>>(
    V
  ) => Iterable<$ValOf<V>>) &
    (<
      V:
        | KeyedCollection<any, any>
        | RecordInstance<any>
        | PlainObjInput<any, any>
    >(
      V
    ) => Iterable<[$KeyOf<V>, $ValOf<V>]>),
  C
>;

const PairSorting: $ReadOnly<{ LeftThenRight: number, RightThenLeft: number }> =
  {
    LeftThenRight: -1,
    RightThenLeft: +1,
  };

type Comparator<T> = (left: T, right: T) => number;

declare class _Collection<K, +V> implements ValueObject {
  equals(other: mixed): boolean;
  hashCode(): number;
  get(key: K, ..._: []): V | void;
  get<NSV>(key: K, notSetValue: NSV): V | NSV;
  has(key: K): boolean;
  includes(value: V): boolean;
  contains(value: V): boolean;
  first<NSV>(notSetValue?: NSV): V | NSV;
  last<NSV>(notSetValue?: NSV): V | NSV;

  hasIn(keyPath: Iterable<mixed>): boolean;

  getIn(keyPath: [], notSetValue?: mixed): this;
  getIn<NSV>(keyPath: [K], notSetValue: NSV): V | NSV;
  getIn<NSV, K2: $KeyOf<V>>(
    keyPath: [K, K2],
    notSetValue: NSV
  ): $ValOf<V, K2> | NSV;
  getIn<NSV, K2: $KeyOf<V>, K3: $KeyOf<$ValOf<V, K2>>>(
    keyPath: [K, K2, K3],
    notSetValue: NSV
  ): $ValOf<$ValOf<V, K2>, K3> | NSV;
  getIn<
    NSV,
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>
  >(
    keyPath: [K, K2, K3, K4],
    notSetValue: NSV
  ): $ValOf<$ValOf<$ValOf<V, K2>, K3>, K4> | NSV;
  getIn<
    NSV,
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>>
  >(
    keyPath: [K, K2, K3, K4, K5],
    notSetValue: NSV
  ): $ValOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>, K5> | NSV;

  update<U>(updater: (value: this) => U): U;

  toJS(): Array<any> | { [key: string]: mixed };
  toJSON(): Array<V> | { [key: string]: V };
  toArray(): Array<V> | Array<[K, V]>;
  toObject(): { [key: string]: V };
  toMap(): Map<K, V>;
  toOrderedMap(): OrderedMap<K, V>;
  toSet(): Set<V>;
  toOrderedSet(): OrderedSet<V>;
  toList(): List<V>;
  toStack(): Stack<V>;
  toSeq(): Seq<K, V>;
  toKeyedSeq(): KeyedSeq<K, V>;
  toIndexedSeq(): IndexedSeq<V>;
  toSetSeq(): SetSeq<V>;

  keys(): Iterator<K>;
  values(): Iterator<V>;
  entries(): Iterator<[K, V]>;

  keySeq(): IndexedSeq<K>;
  valueSeq(): IndexedSeq<V>;
  entrySeq(): IndexedSeq<[K, V]>;

  reverse(): this;
  sort(comparator?: Comparator<V>): this;

  sortBy<C>(
    comparatorValueMapper: (value: V, key: K, iter: this) => C,
    comparator?: Comparator<C>
  ): this;

  groupBy<G>(
    grouper: (value: V, key: K, iter: this) => G,
    context?: mixed
  ): KeyedSeq<G, this>;

  forEach(
    sideEffect: (value: V, key: K, iter: this) => any,
    context?: mixed
  ): number;

  slice(begin?: number, end?: number): this;
  rest(): this;
  butLast(): this;
  skip(amount: number): this;
  skipLast(amount: number): this;
  skipWhile(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): this;
  skipUntil(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): this;
  take(amount: number): this;
  takeLast(amount: number): this;
  takeWhile(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): this;
  takeUntil(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): this;

  filterNot(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): this;

  reduce<R>(
    reducer: (reduction: R, value: V, key: K, iter: this) => R,
    initialReduction: R,
    context?: mixed
  ): R;
  reduce<R>(reducer: (reduction: V | R, value: V, key: K, iter: this) => R): R;

  reduceRight<R>(
    reducer: (reduction: R, value: V, key: K, iter: this) => R,
    initialReduction: R,
    context?: mixed
  ): R;
  reduceRight<R>(
    reducer: (reduction: V | R, value: V, key: K, iter: this) => R
  ): R;

  every(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): boolean;
  some(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): boolean;
  join(separator?: string): string;
  isEmpty(): boolean;
  count(
    predicate?: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): number;
  countBy<G>(
    grouper: (value: V, key: K, iter: this) => G,
    context?: mixed
  ): Map<G, number>;

  find<NSV>(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed,
    notSetValue?: NSV
  ): V | NSV;
  findLast<NSV>(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed,
    notSetValue?: NSV
  ): V | NSV;

  findEntry(predicate: (value: V, key: K, iter: this) => mixed): [K, V] | void;
  findLastEntry(
    predicate: (value: V, key: K, iter: this) => mixed
  ): [K, V] | void;

  findKey(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): K | void;
  findLastKey(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): K | void;

  keyOf(searchValue: V): K | void;
  lastKeyOf(searchValue: V): K | void;

  max(comparator?: Comparator<V>): V;
  maxBy<C>(
    comparatorValueMapper: (value: V, key: K, iter: this) => C,
    comparator?: Comparator<C>
  ): V;
  min(comparator?: Comparator<V>): V;
  minBy<C>(
    comparatorValueMapper: (value: V, key: K, iter: this) => C,
    comparator?: Comparator<C>
  ): V;

  isSubset(iter: Iterable<V>): boolean;
  isSuperset(iter: Iterable<V>): boolean;
}

declare function isImmutable(
  maybeImmutable: mixed
): boolean %checks(maybeImmutable instanceof Collection);
declare function isCollection(
  maybeCollection: mixed
): boolean %checks(maybeCollection instanceof Collection);
declare function isKeyed(
  maybeKeyed: mixed
): boolean %checks(maybeKeyed instanceof KeyedCollection);
declare function isIndexed(
  maybeIndexed: mixed
): boolean %checks(maybeIndexed instanceof IndexedCollection);
declare function isAssociative(
  maybeAssociative: mixed
): boolean %checks(maybeAssociative instanceof KeyedCollection ||
  maybeAssociative instanceof IndexedCollection);
declare function isOrdered(
  maybeOrdered: mixed
): boolean %checks(maybeOrdered instanceof IndexedCollection ||
  maybeOrdered instanceof OrderedMap ||
  maybeOrdered instanceof OrderedSet);
declare function isValueObject(maybeValue: mixed): boolean;

declare function isSeq(maybeSeq: any): boolean %checks(maybeSeq instanceof Seq);
declare function isList(maybeList: any): boolean %checks(maybeList instanceof
  List);
declare function isMap(maybeMap: any): boolean %checks(maybeMap instanceof Map);
declare function isOrderedMap(
  maybeOrderedMap: any
): boolean %checks(maybeOrderedMap instanceof OrderedMap);
declare function isStack(maybeStack: any): boolean %checks(maybeStack instanceof
  Stack);
declare function isSet(maybeSet: any): boolean %checks(maybeSet instanceof Set);
declare function isOrderedSet(
  maybeOrderedSet: any
): boolean %checks(maybeOrderedSet instanceof OrderedSet);
declare function isRecord(
  maybeRecord: any
): boolean %checks(maybeRecord instanceof Record);

declare interface ValueObject {
  equals(other: mixed): boolean;
  hashCode(): number;
}

declare class Collection<K, +V> extends _Collection<K, V> {
  static Keyed: typeof KeyedCollection;
  static Indexed: typeof IndexedCollection;
  static Set: typeof SetCollection;

  static isCollection: typeof isCollection;
  static isKeyed: typeof isKeyed;
  static isIndexed: typeof isIndexed;
  static isAssociative: typeof isAssociative;
  static isOrdered: typeof isOrdered;
}

declare class KeyedCollection<K, +V> extends Collection<K, V> {
  static <K, V>(
    values?: Iterable<[K, V]> | PlainObjInput<K, V>
  ): KeyedCollection<K, V>;

  toJS(): { [key: string]: mixed };
  toJSON(): { [key: string]: V };
  toArray(): Array<[K, V]>;
  @@iterator(): Iterator<[K, V]>;
  toSeq(): KeyedSeq<K, V>;
  flip(): KeyedCollection<V, K>;

  concat<KC, VC>(
    ...iters: Array<Iterable<[KC, VC]> | PlainObjInput<KC, VC>>
  ): KeyedCollection<K | KC, V | VC>;

  filter(predicate: typeof Boolean): KeyedCollection<K, $NonMaybeType<V>>;
  filter(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): KeyedCollection<K, V>;

  partition(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: V, key: K, iter: this) => M,
    context?: mixed
  ): KeyedCollection<K, M>;

  mapKeys<M>(
    mapper: (key: K, value: V, iter: this) => M,
    context?: mixed
  ): KeyedCollection<M, V>;

  mapEntries<KM, VM>(
    mapper: (entry: [K, V], index: number, iter: this) => [KM, VM],
    context?: mixed
  ): KeyedCollection<KM, VM>;

  flatMap<KM, VM>(
    mapper: (value: V, key: K, iter: this) => Iterable<[KM, VM]>,
    context?: mixed
  ): KeyedCollection<KM, VM>;

  flatten(depth?: number): KeyedCollection<any, any>;
  flatten(shallow?: boolean): KeyedCollection<any, any>;
}

Collection.Keyed = KeyedCollection;

declare class IndexedCollection<+T> extends Collection<number, T> {
  static <T>(iter?: Iterable<T>): IndexedCollection<T>;

  toJS(): Array<mixed>;
  toJSON(): Array<T>;
  toArray(): Array<T>;
  @@iterator(): Iterator<T>;
  toSeq(): IndexedSeq<T>;
  fromEntrySeq<K, V>(): KeyedSeq<K, V>;
  interpose(separator: T): this;
  interleave(...collections: Iterable<T>[]): this;
  splice(index: number, removeNum: number, ...values: T[]): this;

  zip<A>(a: Iterable<A>, ..._: []): IndexedCollection<[T, A]>;
  zip<A, B>(
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): IndexedCollection<[T, A, B]>;
  zip<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): IndexedCollection<[T, A, B, C]>;
  zip<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): IndexedCollection<[T, A, B, C, D]>;
  zip<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): IndexedCollection<[T, A, B, C, D, E]>;

  zipAll<A>(a: Iterable<A>, ..._: []): IndexedCollection<[T | void, A | void]>;
  zipAll<A, B>(
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): IndexedCollection<[T | void, A | void, B | void]>;
  zipAll<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): IndexedCollection<[T | void, A | void, B | void, C | void]>;
  zipAll<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): IndexedCollection<[T | void, A | void, B | void, C | void, D | void]>;
  zipAll<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): IndexedCollection<
    [T | void, A | void, B | void, C | void, D | void, E | void]
  >;

  zipWith<A, R>(
    zipper: (value: T, a: A) => R,
    a: Iterable<A>,
    ..._: []
  ): IndexedCollection<R>;
  zipWith<A, B, R>(
    zipper: (value: T, a: A, b: B) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): IndexedCollection<R>;
  zipWith<A, B, C, R>(
    zipper: (value: T, a: A, b: B, c: C) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): IndexedCollection<R>;
  zipWith<A, B, C, D, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): IndexedCollection<R>;
  zipWith<A, B, C, D, E, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D, e: E) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): IndexedCollection<R>;

  indexOf(searchValue: T): number;
  lastIndexOf(searchValue: T): number;
  findIndex(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): number;
  findLastIndex(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): number;

  concat<C>(...iters: Array<Iterable<C> | C>): IndexedCollection<T | C>;

  filter(predicate: typeof Boolean): IndexedCollection<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): IndexedCollection<T>;

  partition(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, index: number, iter: this) => M,
    context?: mixed
  ): IndexedCollection<M>;

  flatMap<M>(
    mapper: (value: T, index: number, iter: this) => Iterable<M>,
    context?: mixed
  ): IndexedCollection<M>;

  flatten(depth?: number): IndexedCollection<any>;
  flatten(shallow?: boolean): IndexedCollection<any>;
}

declare class SetCollection<+T> extends Collection<T, T> {
  static <T>(iter?: Iterable<T>): SetCollection<T>;

  toJS(): Array<mixed>;
  toJSON(): Array<T>;
  toArray(): Array<T>;
  @@iterator(): Iterator<T>;
  toSeq(): SetSeq<T>;

  concat<U>(...collections: Iterable<U>[]): SetCollection<T | U>;

  // `filter`, `map` and `flatMap` cannot be defined further up the hierarchy,
  // because the implementation for `KeyedCollection` allows the value type to
  // change without constraining the key type. That does not work for
  // `SetCollection` - the value and key types *must* match.
  filter(predicate: typeof Boolean): SetCollection<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): SetCollection<T>;

  partition(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, value: T, iter: this) => M,
    context?: mixed
  ): SetCollection<M>;

  flatMap<M>(
    mapper: (value: T, value: T, iter: this) => Iterable<M>,
    context?: mixed
  ): SetCollection<M>;

  flatten(depth?: number): SetCollection<any>;
  flatten(shallow?: boolean): SetCollection<any>;
}

declare function isSeq(maybeSeq: mixed): boolean %checks(maybeSeq instanceof
  Seq);
declare class Seq<K, +V> extends _Collection<K, V> {
  static Keyed: typeof KeyedSeq;
  static Indexed: typeof IndexedSeq;
  static Set: typeof SetSeq;

  static <K, V>(values: KeyedSeq<K, V>): KeyedSeq<K, V>;
  static <T>(values: SetSeq<T>): SetSeq<K, V>;
  static <T>(values: Iterable<T>): IndexedSeq<T>;
  static <K, V>(values?: PlainObjInput<K, V>): KeyedSeq<K, V>;

  static isSeq: typeof isSeq;

  size: number | void;
  cacheResult(): this;
  toSeq(): this;
}

declare class KeyedSeq<K, +V> extends Seq<K, V> mixins KeyedCollection<K, V> {
  static <K, V>(
    values?: Iterable<[K, V]> | PlainObjInput<K, V>
  ): KeyedSeq<K, V>;

  // Override specialized return types
  flip(): KeyedSeq<V, K>;

  concat<KC, VC>(
    ...iters: Array<Iterable<[KC, VC]> | PlainObjInput<KC, VC>>
  ): KeyedSeq<K | KC, V | VC>;

  filter(predicate: typeof Boolean): KeyedSeq<K, $NonMaybeType<V>>;
  filter(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): KeyedSeq<K, V>;

  partition(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: V, key: K, iter: this) => M,
    context?: mixed
  ): KeyedSeq<K, M>;

  mapKeys<M>(
    mapper: (key: K, value: V, iter: this) => M,
    context?: mixed
  ): KeyedSeq<M, V>;

  mapEntries<KM, VM>(
    mapper: (entry: [K, V], index: number, iter: this) => [KM, VM],
    context?: mixed
  ): KeyedSeq<KM, VM>;

  flatMap<KM, VM>(
    mapper: (value: V, key: K, iter: this) => Iterable<[KM, VM]>,
    context?: mixed
  ): KeyedSeq<KM, VM>;

  flatten(depth?: number): KeyedSeq<any, any>;
  flatten(shallow?: boolean): KeyedSeq<any, any>;
}

declare class IndexedSeq<+T>
  extends Seq<number, T>
  mixins IndexedCollection<T>
{
  static <T>(values?: Iterable<T>): IndexedSeq<T>;

  static of<T>(...values: T[]): IndexedSeq<T>;

  // Override specialized return types

  concat<C>(...iters: Array<Iterable<C> | C>): IndexedSeq<T | C>;

  filter(predicate: typeof Boolean): IndexedSeq<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): IndexedSeq<T>;

  partition(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, index: number, iter: this) => M,
    context?: mixed
  ): IndexedSeq<M>;

  flatMap<M>(
    mapper: (value: T, index: number, iter: this) => Iterable<M>,
    context?: mixed
  ): IndexedSeq<M>;

  flatten(depth?: number): IndexedSeq<any>;
  flatten(shallow?: boolean): IndexedSeq<any>;

  zip<A>(a: Iterable<A>, ..._: []): IndexedSeq<[T, A]>;
  zip<A, B>(a: Iterable<A>, b: Iterable<B>, ..._: []): IndexedSeq<[T, A, B]>;
  zip<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): IndexedSeq<[T, A, B, C]>;
  zip<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): IndexedSeq<[T, A, B, C, D]>;
  zip<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): IndexedSeq<[T, A, B, C, D, E]>;

  zipAll<A>(a: Iterable<A>, ..._: []): IndexedSeq<[T | void, A | void]>;
  zipAll<A, B>(
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): IndexedSeq<[T | void, A | void, B | void]>;
  zipAll<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): IndexedSeq<[T | void, A | void, B | void, C | void]>;
  zipAll<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): IndexedSeq<[T | void, A | void, B | void, C | void, D | void]>;
  zipAll<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): IndexedSeq<[T | void, A | void, B | void, C | void, D | void, E | void]>;

  zipWith<A, R>(
    zipper: (value: T, a: A) => R,
    a: Iterable<A>,
    ..._: []
  ): IndexedSeq<R>;
  zipWith<A, B, R>(
    zipper: (value: T, a: A, b: B) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): IndexedSeq<R>;
  zipWith<A, B, C, R>(
    zipper: (value: T, a: A, b: B, c: C) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): IndexedSeq<R>;
  zipWith<A, B, C, D, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): IndexedSeq<R>;
  zipWith<A, B, C, D, E, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D, e: E) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): IndexedSeq<R>;
}

declare class SetSeq<+T> extends Seq<T, T> mixins SetCollection<T> {
  static <T>(values?: Iterable<T>): SetSeq<T>;

  static of<T>(...values: T[]): SetSeq<T>;

  // Override specialized return types

  concat<U>(...collections: Iterable<U>[]): SetSeq<T | U>;

  filter(predicate: typeof Boolean): SetSeq<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): SetSeq<T>;

  partition(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, value: T, iter: this) => M,
    context?: mixed
  ): SetSeq<M>;

  flatMap<M>(
    mapper: (value: T, value: T, iter: this) => Iterable<M>,
    context?: mixed
  ): SetSeq<M>;

  flatten(depth?: number): SetSeq<any>;
  flatten(shallow?: boolean): SetSeq<any>;
}

declare class UpdatableInCollection<K, +V> {
  setIn<S>(keyPath: [], value: S): S;
  setIn(keyPath: [K], value: V): this;
  setIn<K2: $KeyOf<V>, S: $ValOf<V, K2>>(keyPath: [K, K2], value: S): this;
  setIn<K2: $KeyOf<V>, K3: $KeyOf<$ValOf<V, K2>>, S: $ValOf<$ValOf<V, K2>, K3>>(
    keyPath: [K, K2, K3],
    value: S
  ): this;
  setIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    S: $ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>
  >(
    keyPath: [K, K2, K3, K4],
    value: S
  ): this;
  setIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>, K5>
  >(
    keyPath: [K, K2, K3, K4, K5],
    value: S
  ): this;

  deleteIn(keyPath: []): void;
  deleteIn(keyPath: [K]): this;
  deleteIn<K2: $KeyOf<V>>(keyPath: [K, K2]): this;
  deleteIn<K2: $KeyOf<V>, K3: $KeyOf<$ValOf<V, K2>>>(
    keyPath: [K, K2, K3]
  ): this;
  deleteIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>
  >(
    keyPath: [K, K2, K3, K4]
  ): this;
  deleteIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>>
  >(
    keyPath: [K, K2, K3, K4, K5]
  ): this;

  removeIn(keyPath: []): void;
  removeIn(keyPath: [K]): this;
  removeIn<K2: $KeyOf<V>>(keyPath: [K, K2]): this;
  removeIn<K2: $KeyOf<V>, K3: $KeyOf<$ValOf<V, K2>>>(
    keyPath: [K, K2, K3]
  ): this;
  removeIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>
  >(
    keyPath: [K, K2, K3, K4]
  ): this;
  removeIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>>
  >(
    keyPath: [K, K2, K3, K4, K5]
  ): this;

  updateIn<U>(keyPath: [], notSetValue: mixed, updater: (value: this) => U): U;
  updateIn<U>(keyPath: [], updater: (value: this) => U): U;
  updateIn<NSV>(keyPath: [K], notSetValue: NSV, updater: (value: V) => V): this;
  updateIn(keyPath: [K], updater: (value: V) => V): this;
  updateIn<NSV, K2: $KeyOf<V>, S: $ValOf<V, K2>>(
    keyPath: [K, K2],
    notSetValue: NSV,
    updater: (value: $ValOf<V, K2> | NSV) => S
  ): this;
  updateIn<K2: $KeyOf<V>, S: $ValOf<V, K2>>(
    keyPath: [K, K2],
    updater: (value: $ValOf<V, K2>) => S
  ): this;
  updateIn<
    NSV,
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    S: $ValOf<$ValOf<V, K2>, K3>
  >(
    keyPath: [K, K2, K3],
    notSetValue: NSV,
    updater: (value: $ValOf<$ValOf<V, K2>, K3> | NSV) => S
  ): this;
  updateIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    S: $ValOf<$ValOf<V, K2>, K3>
  >(
    keyPath: [K, K2, K3],
    updater: (value: $ValOf<$ValOf<V, K2>, K3>) => S
  ): this;
  updateIn<
    NSV,
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    S: $ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>
  >(
    keyPath: [K, K2, K3, K4],
    notSetValue: NSV,
    updater: (value: $ValOf<$ValOf<$ValOf<V, K2>, K3>, K4> | NSV) => S
  ): this;
  updateIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    S: $ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>
  >(
    keyPath: [K, K2, K3, K4],
    updater: (value: $ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>) => S
  ): this;
  updateIn<
    NSV,
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>, K5>
  >(
    keyPath: [K, K2, K3, K4, K5],
    notSetValue: NSV,
    updater: (
      value: $ValOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>, K5> | NSV
    ) => S
  ): this;
  updateIn<
    K2: $KeyOf<V>,
    K3: $KeyOf<$ValOf<V, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<V, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>, K5>
  >(
    keyPath: [K, K2, K3, K4, K5],
    updater: (value: $ValOf<$ValOf<$ValOf<$ValOf<V, K2>, K3>, K4>, K5>) => S
  ): this;
}

declare function isList(maybeList: mixed): boolean %checks(maybeList instanceof
  List);
declare class List<+T>
  extends IndexedCollection<T>
  mixins UpdatableInCollection<number, T>
{
  static (collection?: Iterable<T>): List<T>;

  static of<T>(...values: T[]): List<T>;

  static isList: typeof isList;

  size: number;

  set<U>(index: number, value: U): List<T | U>;
  delete(index: number): this;
  remove(index: number): this;
  insert<U>(index: number, value: U): List<T | U>;
  clear(): this;
  push<U>(...values: U[]): List<T | U>;
  pop(): this;
  unshift<U>(...values: U[]): List<T | U>;
  shift(): this;

  update<U>(updater: (value: this) => U): U;
  update<U>(index: number, updater: (value: T) => U): List<T | U>;
  update<U>(
    index: number,
    notSetValue: U,
    updater: (value: T) => U
  ): List<T | U>;

  merge<U>(...collections: Iterable<U>[]): List<T | U>;

  setSize(size: number): this;

  mergeIn(keyPath: Iterable<mixed>, ...collections: Iterable<mixed>[]): this;
  mergeDeepIn(
    keyPath: Iterable<mixed>,
    ...collections: Iterable<mixed>[]
  ): this;

  withMutations(mutator: (mutable: this) => mixed): this;
  asMutable(): this;
  wasAltered(): boolean;
  asImmutable(): this;

  // Override specialized return types

  concat<C>(...iters: Array<Iterable<C> | C>): List<T | C>;

  filter(predicate: typeof Boolean): List<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): List<T>;

  partition(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, index: number, iter: this) => M,
    context?: mixed
  ): List<M>;

  flatMap<M>(
    mapper: (value: T, index: number, iter: this) => Iterable<M>,
    context?: mixed
  ): List<M>;

  flatten(depth?: number): List<any>;
  flatten(shallow?: boolean): List<any>;

  zip<A>(a: Iterable<A>, ..._: []): List<[T, A]>;
  zip<A, B>(a: Iterable<A>, b: Iterable<B>, ..._: []): List<[T, A, B]>;
  zip<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): List<[T, A, B, C]>;
  zip<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): List<[T, A, B, C, D]>;
  zip<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): List<[T, A, B, C, D, E]>;

  zipAll<A>(a: Iterable<A>, ..._: []): List<[T | void, A | void]>;
  zipAll<A, B>(
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): List<[T | void, A | void, B | void]>;
  zipAll<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): List<[T | void, A | void, B | void, C | void]>;
  zipAll<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): List<[T | void, A | void, B | void, C | void, D | void]>;
  zipAll<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): List<[T | void, A | void, B | void, C | void, D | void, E | void]>;

  zipWith<A, R>(
    zipper: (value: T, a: A) => R,
    a: Iterable<A>,
    ..._: []
  ): List<R>;
  zipWith<A, B, R>(
    zipper: (value: T, a: A, b: B) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): List<R>;
  zipWith<A, B, C, R>(
    zipper: (value: T, a: A, b: B, c: C) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): List<R>;
  zipWith<A, B, C, D, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): List<R>;
  zipWith<A, B, C, D, E, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D, e: E) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): List<R>;
}

declare function isMap(maybeMap: mixed): boolean %checks(maybeMap instanceof
  Map);
declare class Map<K, +V>
  extends KeyedCollection<K, V>
  mixins UpdatableInCollection<K, V>
{
  static <K, V>(values?: Iterable<[K, V]> | PlainObjInput<K, V>): Map<K, V>;

  static isMap: typeof isMap;

  size: number;

  set<K_, V_>(key: K_, value: V_): Map<K | K_, V | V_>;
  delete(key: K): this;
  remove(key: K): this;
  clear(): this;

  deleteAll(keys: Iterable<K>): Map<K, V>;
  removeAll(keys: Iterable<K>): Map<K, V>;

  update<U>(updater: (value: this) => U): U;
  update<V_>(key: K, updater: (value: V) => V_): Map<K, V | V_>;
  update<V_>(
    key: K,
    notSetValue: V_,
    updater: (value: V) => V_
  ): Map<K, V | V_>;

  merge<K_, V_>(
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): Map<K | K_, V | V_>;
  concat<K_, V_>(
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): Map<K | K_, V | V_>;

  mergeWith<K_, W, X>(
    merger: (oldVal: V, newVal: W, key: K) => X,
    ...collections: (Iterable<[K_, W]> | PlainObjInput<K_, W>)[]
  ): Map<K | K_, V | W | X>;

  mergeDeep<K_, V_>(
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): Map<K | K_, V | V_>;

  mergeDeepWith<K_, V_>(
    merger: (oldVal: any, newVal: any, key: any) => mixed,
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): Map<K | K_, V | V_>;

  mergeIn(
    keyPath: Iterable<mixed>,
    ...collections: (Iterable<mixed> | PlainObjInput<mixed, mixed>)[]
  ): this;
  mergeDeepIn(
    keyPath: Iterable<mixed>,
    ...collections: (Iterable<mixed> | PlainObjInput<mixed, mixed>)[]
  ): this;

  withMutations(mutator: (mutable: this) => mixed): this;
  asMutable(): this;
  wasAltered(): boolean;
  asImmutable(): this;

  // Override specialized return types

  flip(): Map<V, K>;

  filter(predicate: typeof Boolean): Map<K, $NonMaybeType<V>>;
  filter(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): Map<K, V>;

  partition(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: V, key: K, iter: this) => M,
    context?: mixed
  ): Map<K, M>;

  mapKeys<M>(
    mapper: (key: K, value: V, iter: this) => M,
    context?: mixed
  ): Map<M, V>;

  mapEntries<KM, VM>(
    mapper: (entry: [K, V], index: number, iter: this) => [KM, VM],
    context?: mixed
  ): Map<KM, VM>;

  flatMap<KM, VM>(
    mapper: (value: V, key: K, iter: this) => Iterable<[KM, VM]>,
    context?: mixed
  ): Map<KM, VM>;

  flatten(depth?: number): Map<any, any>;
  flatten(shallow?: boolean): Map<any, any>;
}

declare function isOrderedMap(
  maybeOrderedMap: mixed
): boolean %checks(maybeOrderedMap instanceof OrderedMap);
declare class OrderedMap<K, +V>
  extends Map<K, V>
  mixins UpdatableInCollection<K, V>
{
  static <K, V>(
    values?: Iterable<[K, V]> | PlainObjInput<K, V>
  ): OrderedMap<K, V>;

  static isOrderedMap: typeof isOrderedMap;

  size: number;

  set<K_, V_>(key: K_, value: V_): OrderedMap<K | K_, V | V_>;
  delete(key: K): this;
  remove(key: K): this;
  clear(): this;

  update<U>(updater: (value: this) => U): U;
  update<V_>(key: K, updater: (value: V) => V_): OrderedMap<K, V | V_>;
  update<V_>(
    key: K,
    notSetValue: V_,
    updater: (value: V) => V_
  ): OrderedMap<K, V | V_>;

  merge<K_, V_>(
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): OrderedMap<K | K_, V | V_>;
  concat<K_, V_>(
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): OrderedMap<K | K_, V | V_>;

  mergeWith<K_, W, X>(
    merger: (oldVal: V, newVal: W, key: K) => X,
    ...collections: (Iterable<[K_, W]> | PlainObjInput<K_, W>)[]
  ): OrderedMap<K | K_, V | W | X>;

  mergeDeep<K_, V_>(
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): OrderedMap<K | K_, V | V_>;

  mergeDeepWith<K_, V_>(
    merger: (oldVal: any, newVal: any, key: any) => mixed,
    ...collections: (Iterable<[K_, V_]> | PlainObjInput<K_, V_>)[]
  ): OrderedMap<K | K_, V | V_>;

  mergeIn(
    keyPath: Iterable<mixed>,
    ...collections: (Iterable<mixed> | PlainObjInput<mixed, mixed>)[]
  ): this;
  mergeDeepIn(
    keyPath: Iterable<mixed>,
    ...collections: (Iterable<mixed> | PlainObjInput<mixed, mixed>)[]
  ): this;

  withMutations(mutator: (mutable: this) => mixed): this;
  asMutable(): this;
  wasAltered(): boolean;
  asImmutable(): this;

  // Override specialized return types

  flip(): OrderedMap<V, K>;

  filter(predicate: typeof Boolean): OrderedMap<K, $NonMaybeType<V>>;
  filter(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): OrderedMap<K, V>;

  partition(
    predicate: (value: V, key: K, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: V, key: K, iter: this) => M,
    context?: mixed
  ): OrderedMap<K, M>;

  mapKeys<M>(
    mapper: (key: K, value: V, iter: this) => M,
    context?: mixed
  ): OrderedMap<M, V>;

  mapEntries<KM, VM>(
    mapper: (entry: [K, V], index: number, iter: this) => [KM, VM],
    context?: mixed
  ): OrderedMap<KM, VM>;

  flatMap<KM, VM>(
    mapper: (value: V, key: K, iter: this) => Iterable<[KM, VM]>,
    context?: mixed
  ): OrderedMap<KM, VM>;

  flatten(depth?: number): OrderedMap<any, any>;
  flatten(shallow?: boolean): OrderedMap<any, any>;
}

declare function isSet(maybeSet: mixed): boolean %checks(maybeSet instanceof
  Set);
declare class Set<+T> extends SetCollection<T> {
  static <T>(values?: Iterable<T>): Set<T>;

  static of<T>(...values: T[]): Set<T>;
  static fromKeys<T>(
    values: Iterable<[T, mixed]> | PlainObjInput<T, mixed>
  ): Set<T>;

  static intersect(sets: Iterable<Iterable<T>>): Set<T>;
  static union(sets: Iterable<Iterable<T>>): Set<T>;

  static isSet: typeof isSet;

  size: number;

  add<U>(value: U): Set<T | U>;
  delete(value: T): this;
  remove(value: T): this;
  clear(): this;
  union<U>(...collections: Iterable<U>[]): Set<T | U>;
  merge<U>(...collections: Iterable<U>[]): Set<T | U>;
  concat<U>(...collections: Iterable<U>[]): Set<T | U>;
  intersect<U>(...collections: Iterable<U>[]): Set<T & U>;
  subtract(...collections: Iterable<mixed>[]): this;

  withMutations(mutator: (mutable: this) => mixed): this;
  asMutable(): this;
  wasAltered(): boolean;
  asImmutable(): this;

  // Override specialized return types

  filter(predicate: typeof Boolean): Set<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): Set<T>;

  partition(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, value: T, iter: this) => M,
    context?: mixed
  ): Set<M>;

  flatMap<M>(
    mapper: (value: T, value: T, iter: this) => Iterable<M>,
    context?: mixed
  ): Set<M>;

  flatten(depth?: number): Set<any>;
  flatten(shallow?: boolean): Set<any>;
}

// Overrides except for `isOrderedSet` are for specialized return types
declare function isOrderedSet(
  maybeOrderedSet: mixed
): boolean %checks(maybeOrderedSet instanceof OrderedSet);
declare class OrderedSet<+T> extends Set<T> {
  static <T>(values?: Iterable<T>): OrderedSet<T>;

  static of<T>(...values: T[]): OrderedSet<T>;
  static fromKeys<T>(
    values: Iterable<[T, mixed]> | PlainObjInput<T, mixed>
  ): OrderedSet<T>;

  static isOrderedSet: typeof isOrderedSet;

  size: number;

  add<U>(value: U): OrderedSet<T | U>;
  union<U>(...collections: Iterable<U>[]): OrderedSet<T | U>;
  merge<U>(...collections: Iterable<U>[]): OrderedSet<T | U>;
  concat<U>(...collections: Iterable<U>[]): OrderedSet<T | U>;
  intersect<U>(...collections: Iterable<U>[]): OrderedSet<T & U>;

  filter(predicate: typeof Boolean): OrderedSet<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): OrderedSet<T>;

  partition(
    predicate: (value: T, value: T, iter: this) => mixed,
    context?: mixed
  ): [this, this];

  map<M>(
    mapper: (value: T, value: T, iter: this) => M,
    context?: mixed
  ): OrderedSet<M>;

  flatMap<M>(
    mapper: (value: T, value: T, iter: this) => Iterable<M>,
    context?: mixed
  ): OrderedSet<M>;

  flatten(depth?: number): OrderedSet<any>;
  flatten(shallow?: boolean): OrderedSet<any>;

  zip<A>(a: Iterable<A>, ..._: []): OrderedSet<[T, A]>;
  zip<A, B>(a: Iterable<A>, b: Iterable<B>, ..._: []): OrderedSet<[T, A, B]>;
  zip<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): OrderedSet<[T, A, B, C]>;
  zip<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): OrderedSet<[T, A, B, C, D]>;
  zip<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): OrderedSet<[T, A, B, C, D, E]>;

  zipAll<A>(a: Iterable<A>, ..._: []): OrderedSet<[T | void, A | void]>;
  zipAll<A, B>(
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): OrderedSet<[T | void, A | void, B | void]>;
  zipAll<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): OrderedSet<[T | void, A | void, B | void, C | void]>;
  zipAll<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): OrderedSet<[T | void, A | void, B | void, C | void, D | void]>;
  zipAll<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): OrderedSet<[T | void, A | void, B | void, C | void, D | void, E | void]>;

  zipWith<A, R>(
    zipper: (value: T, a: A) => R,
    a: Iterable<A>,
    ..._: []
  ): OrderedSet<R>;
  zipWith<A, B, R>(
    zipper: (value: T, a: A, b: B) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): OrderedSet<R>;
  zipWith<A, B, C, R>(
    zipper: (value: T, a: A, b: B, c: C) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): OrderedSet<R>;
  zipWith<A, B, C, D, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): OrderedSet<R>;
  zipWith<A, B, C, D, E, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D, e: E) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): OrderedSet<R>;
}

declare function isStack(
  maybeStack: mixed
): boolean %checks(maybeStack instanceof Stack);
declare class Stack<+T> extends IndexedCollection<T> {
  static <T>(collection?: Iterable<T>): Stack<T>;

  static isStack(maybeStack: mixed): boolean;
  static of<T>(...values: T[]): Stack<T>;

  static isStack: typeof isStack;

  size: number;

  peek(): T;
  clear(): this;
  unshift<U>(...values: U[]): Stack<T | U>;
  unshiftAll<U>(iter: Iterable<U>): Stack<T | U>;
  shift(): this;
  push<U>(...values: U[]): Stack<T | U>;
  pushAll<U>(iter: Iterable<U>): Stack<T | U>;
  pop(): this;

  withMutations(mutator: (mutable: this) => mixed): this;
  asMutable(): this;
  wasAltered(): boolean;
  asImmutable(): this;

  // Override specialized return types

  concat<C>(...iters: Array<Iterable<C> | C>): Stack<T | C>;

  filter(predicate: typeof Boolean): Stack<$NonMaybeType<T>>;
  filter(
    predicate: (value: T, index: number, iter: this) => mixed,
    context?: mixed
  ): Stack<T>;

  map<M>(
    mapper: (value: T, index: number, iter: this) => M,
    context?: mixed
  ): Stack<M>;

  flatMap<M>(
    mapper: (value: T, index: number, iter: this) => Iterable<M>,
    context?: mixed
  ): Stack<M>;

  flatten(depth?: number): Stack<any>;
  flatten(shallow?: boolean): Stack<any>;

  zip<A>(a: Iterable<A>, ..._: []): Stack<[T, A]>;
  zip<A, B>(a: Iterable<A>, b: Iterable<B>, ..._: []): Stack<[T, A, B]>;
  zip<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): Stack<[T, A, B, C]>;
  zip<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): Stack<[T, A, B, C, D]>;
  zip<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): Stack<[T, A, B, C, D, E]>;

  zipAll<A>(a: Iterable<A>, ..._: []): Stack<[T | void, A | void]>;
  zipAll<A, B>(
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): Stack<[T | void, A | void, B | void]>;
  zipAll<A, B, C>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): Stack<[T | void, A | void, B | void, C | void]>;
  zipAll<A, B, C, D>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): Stack<[T | void, A | void, B | void, C | void, D | void]>;
  zipAll<A, B, C, D, E>(
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): Stack<[T | void, A | void, B | void, C | void, D | void, E | void]>;

  zipWith<A, R>(
    zipper: (value: T, a: A) => R,
    a: Iterable<A>,
    ..._: []
  ): Stack<R>;
  zipWith<A, B, R>(
    zipper: (value: T, a: A, b: B) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    ..._: []
  ): Stack<R>;
  zipWith<A, B, C, R>(
    zipper: (value: T, a: A, b: B, c: C) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    ..._: []
  ): Stack<R>;
  zipWith<A, B, C, D, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    ..._: []
  ): Stack<R>;
  zipWith<A, B, C, D, E, R>(
    zipper: (value: T, a: A, b: B, c: C, d: D, e: E) => R,
    a: Iterable<A>,
    b: Iterable<B>,
    c: Iterable<C>,
    d: Iterable<D>,
    e: Iterable<E>,
    ..._: []
  ): Stack<R>;
}

declare function Range(
  start?: number,
  end?: number,
  step?: number
): IndexedSeq<number>;
declare function Repeat<T>(value: T, times?: number): IndexedSeq<T>;

// The type of a Record factory function.
type RecordFactory<Values: Object> = Class<RecordInstance<Values>>;

// The type of runtime Record instances.
type RecordOf<Values: Object> = RecordInstance<Values> & $ReadOnly<Values>;

// The values of a Record instance.
type _RecordValues<T, R: RecordInstance<T> | T> = R;
type RecordValues<R> = _RecordValues<*, R>;

declare function isRecord(
  maybeRecord: any
): boolean %checks(maybeRecord instanceof RecordInstance);
declare class Record {
  static <Values: Object>(spec: Values, name?: string): typeof RecordInstance;
  constructor<Values: Object>(
    spec: Values,
    name?: string
  ): typeof RecordInstance;

  static isRecord: typeof isRecord;

  static getDescriptiveName(record: RecordInstance<any>): string;
}

declare class RecordInstance<T: Object = Object> {
  static (values?: Iterable<[$Keys<T>, $ValOf<T>]> | $Shape<T>): RecordOf<T>;
  // Note: a constructor can only create an instance of RecordInstance<T>,
  // it's encouraged to not use `new` when creating Records.
  constructor(values?: Iterable<[$Keys<T>, $ValOf<T>]> | $Shape<T>): void;

  size: number;

  has(key: string): boolean;

  get<K: $Keys<T>>(key: K, ..._: []): $ElementType<T, K>;
  get<K: $Keys<T>, NSV>(key: K, notSetValue: NSV): $ElementType<T, K> | NSV;

  hasIn(keyPath: Iterable<mixed>): boolean;

  getIn(keyPath: [], notSetValue?: mixed): this & $ReadOnly<T>;
  getIn<K: $Keys<T>>(keyPath: [K], notSetValue?: mixed): $ElementType<T, K>;
  getIn<NSV, K: $Keys<T>, K2: $KeyOf<$ValOf<T, K>>>(
    keyPath: [K, K2],
    notSetValue: NSV
  ): $ValOf<$ValOf<T, K>, K2> | NSV;
  getIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>
  >(
    keyPath: [K, K2, K3],
    notSetValue: NSV
  ): $ValOf<$ValOf<$ValOf<T, K>, K2>, K3> | NSV;
  getIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>
  >(
    keyPath: [K, K2, K3, K4],
    notSetValue: NSV
  ): $ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4> | NSV;
  getIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>>
  >(
    keyPath: [K, K2, K3, K4, K5],
    notSetValue: NSV
  ): $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>, K5> | NSV;

  equals(other: any): boolean;
  hashCode(): number;

  set<K: $Keys<T>>(key: K, value: $ElementType<T, K>): this & $ReadOnly<T>;
  update<K: $Keys<T>>(
    key: K,
    updater: (value: $ElementType<T, K>) => $ElementType<T, K>
  ): this & $ReadOnly<T>;
  merge(
    ...collections: Array<Iterable<[$Keys<T>, $ValOf<T>]> | $Shape<T>>
  ): this & $ReadOnly<T>;
  mergeDeep(
    ...collections: Array<Iterable<[$Keys<T>, $ValOf<T>]> | $Shape<T>>
  ): this & $ReadOnly<T>;

  mergeWith(
    merger: (oldVal: $ValOf<T>, newVal: $ValOf<T>, key: $Keys<T>) => $ValOf<T>,
    ...collections: Array<Iterable<[$Keys<T>, $ValOf<T>]> | $Shape<T>>
  ): this & $ReadOnly<T>;
  mergeDeepWith(
    merger: (oldVal: any, newVal: any, key: any) => any,
    ...collections: Array<Iterable<[$Keys<T>, $ValOf<T>]> | $Shape<T>>
  ): this & $ReadOnly<T>;

  delete<K: $Keys<T>>(key: K): this & $ReadOnly<T>;
  remove<K: $Keys<T>>(key: K): this & $ReadOnly<T>;
  clear(): this & $ReadOnly<T>;

  setIn<S>(keyPath: [], value: S): S;
  setIn<K: $Keys<T>, S: $ValOf<T, K>>(
    keyPath: [K],
    value: S
  ): this & $ReadOnly<T>;
  setIn<K: $Keys<T>, K2: $KeyOf<$ValOf<T, K>>, S: $ValOf<$ValOf<T, K>, K2>>(
    keyPath: [K, K2],
    value: S
  ): this & $ReadOnly<T>;
  setIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    S: $ValOf<$ValOf<$ValOf<T, K>, K2>, K3>
  >(
    keyPath: [K, K2, K3],
    value: S
  ): this & $ReadOnly<T>;
  setIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>
  >(
    keyPath: [K, K2, K3, K4],
    value: S
  ): this & $ReadOnly<T>;
  setIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>, K5>
  >(
    keyPath: [K, K2, K3, K4, K5],
    value: S
  ): this & $ReadOnly<T>;

  deleteIn(keyPath: []): void;
  deleteIn<K: $Keys<T>>(keyPath: [K]): this & $ReadOnly<T>;
  deleteIn<K: $Keys<T>, K2: $KeyOf<$ValOf<T, K>>>(
    keyPath: [K, K2]
  ): this & $ReadOnly<T>;
  deleteIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>
  >(
    keyPath: [K, K2, K3]
  ): this & $ReadOnly<T>;
  deleteIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>
  >(
    keyPath: [K, K2, K3, K4]
  ): this & $ReadOnly<T>;
  deleteIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>>
  >(
    keyPath: [K, K2, K3, K4, K5]
  ): this & $ReadOnly<T>;

  removeIn(keyPath: []): void;
  removeIn<K: $Keys<T>>(keyPath: [K]): this & $ReadOnly<T>;
  removeIn<K: $Keys<T>, K2: $KeyOf<$ValOf<T, K>>>(
    keyPath: [K, K2]
  ): this & $ReadOnly<T>;
  removeIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>
  >(
    keyPath: [K, K2, K3]
  ): this & $ReadOnly<T>;
  removeIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>
  >(
    keyPath: [K, K2, K3, K4]
  ): this & $ReadOnly<T>;
  removeIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>>
  >(
    keyPath: [K, K2, K3, K4, K5]
  ): this & $ReadOnly<T>;

  updateIn<U>(
    keyPath: [],
    notSetValue: mixed,
    updater: (value: this & T) => U
  ): U;
  updateIn<U>(keyPath: [], updater: (value: this & T) => U): U;
  updateIn<NSV, K: $Keys<T>, S: $ValOf<T, K>>(
    keyPath: [K],
    notSetValue: NSV,
    updater: (value: $ValOf<T, K>) => S
  ): this & $ReadOnly<T>;
  updateIn<K: $Keys<T>, S: $ValOf<T, K>>(
    keyPath: [K],
    updater: (value: $ValOf<T, K>) => S
  ): this & $ReadOnly<T>;
  updateIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    S: $ValOf<$ValOf<T, K>, K2>
  >(
    keyPath: [K, K2],
    notSetValue: NSV,
    updater: (value: $ValOf<$ValOf<T, K>, K2> | NSV) => S
  ): this & $ReadOnly<T>;
  updateIn<K: $Keys<T>, K2: $KeyOf<$ValOf<T, K>>, S: $ValOf<$ValOf<T, K>, K2>>(
    keyPath: [K, K2],
    updater: (value: $ValOf<$ValOf<T, K>, K2>) => S
  ): this & $ReadOnly<T>;
  updateIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    S: $ValOf<$ValOf<$ValOf<T, K>, K2>, K3>
  >(
    keyPath: [K, K2, K3],
    notSetValue: NSV,
    updater: (value: $ValOf<$ValOf<$ValOf<T, K>, K2>, K3> | NSV) => S
  ): this & $ReadOnly<T>;
  updateIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    S: $ValOf<$ValOf<$ValOf<T, K>, K2>, K3>
  >(
    keyPath: [K, K2, K3],
    updater: (value: $ValOf<$ValOf<$ValOf<T, K>, K2>, K3>) => S
  ): this & $ReadOnly<T>;
  updateIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>
  >(
    keyPath: [K, K2, K3, K4],
    notSetValue: NSV,
    updater: (
      value: $ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4> | NSV
    ) => S
  ): this & $ReadOnly<T>;
  updateIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>
  >(
    keyPath: [K, K2, K3, K4],
    updater: (value: $ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>) => S
  ): this & $ReadOnly<T>;
  updateIn<
    NSV,
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>, K5>
  >(
    keyPath: [K, K2, K3, K4, K5],
    notSetValue: NSV,
    updater: (
      value: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>, K5> | NSV
    ) => S
  ): this & $ReadOnly<T>;
  updateIn<
    K: $Keys<T>,
    K2: $KeyOf<$ValOf<T, K>>,
    K3: $KeyOf<$ValOf<$ValOf<T, K>, K2>>,
    K4: $KeyOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>>,
    K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>>,
    S: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>, K5>
  >(
    keyPath: [K, K2, K3, K4, K5],
    updater: (
      value: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<T, K>, K2>, K3>, K4>, K5>
    ) => S
  ): this & $ReadOnly<T>;

  mergeIn(
    keyPath: Iterable<mixed>,
    ...collections: Array<any>
  ): this & $ReadOnly<T>;
  mergeDeepIn(
    keyPath: Iterable<mixed>,
    ...collections: Array<any>
  ): this & $ReadOnly<T>;

  toSeq(): KeyedSeq<$Keys<T>, any>;

  toJS(): { [key: $Keys<T>]: mixed };
  toJSON(): T;
  toObject(): T;

  withMutations(mutator: (mutable: this & T) => mixed): this & $ReadOnly<T>;
  asMutable(): this & $ReadOnly<T>;
  wasAltered(): boolean;
  asImmutable(): this & $ReadOnly<T>;

  @@iterator(): Iterator<[$Keys<T>, $ValOf<T>]>;
}

declare function fromJS(
  jsValue: mixed,
  reviver?: (
    key: string | number,
    sequence: KeyedCollection<string, mixed> | IndexedCollection<mixed>,
    path?: Array<string | number>
  ) => mixed
): Collection<mixed, mixed>;

declare function is(first: mixed, second: mixed): boolean;
declare function hash(value: mixed): number;

declare function get<C: Object, K: $Keys<C>>(
  collection: C,
  key: K,
  notSetValue: mixed
): $ValOf<C, K>;
declare function get<C, K: $KeyOf<C>, NSV>(
  collection: C,
  key: K,
  notSetValue: NSV
): $ValOf<C, K> | NSV;

declare function has(collection: Object, key: mixed): boolean;
declare function remove<C>(collection: C, key: $KeyOf<C>): C;
declare function set<C, K: $KeyOf<C>, V: $ValOf<C, K>>(
  collection: C,
  key: K,
  value: V
): C;
declare function update<C, K: $KeyOf<C>, V: $ValOf<C, K>, NSV>(
  collection: C,
  key: K,
  notSetValue: NSV,
  updater: ($ValOf<C, K> | NSV) => V
): C;
declare function update<C, K: $KeyOf<C>, V: $ValOf<C, K>>(
  collection: C,
  key: K,
  updater: ($ValOf<C, K>) => V
): C;

declare function getIn<C>(collection: C, keyPath: [], notSetValue?: mixed): C;
declare function getIn<C, K: $KeyOf<C>, NSV>(
  collection: C,
  keyPath: [K],
  notSetValue: NSV
): $ValOf<C, K> | NSV;
declare function getIn<C, K: $KeyOf<C>, K2: $KeyOf<$ValOf<C, K>>, NSV>(
  collection: C,
  keyPath: [K, K2],
  notSetValue: NSV
): $ValOf<$ValOf<C, K>, K2> | NSV;
declare function getIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  NSV
>(
  collection: C,
  keyPath: [K, K2, K3],
  notSetValue: NSV
): $ValOf<$ValOf<$ValOf<C, K>, K2>, K3> | NSV;
declare function getIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  NSV
>(
  collection: C,
  keyPath: [K, K2, K3, K4],
  notSetValue: NSV
): $ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4> | NSV;
declare function getIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>>,
  NSV
>(
  collection: C,
  keyPath: [K, K2, K3, K4, K5],
  notSetValue: NSV
): $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>, K5> | NSV;

declare function hasIn(collection: Object, keyPath: Iterable<mixed>): boolean;

declare function removeIn<C>(collection: C, keyPath: []): void;
declare function removeIn<C, K: $KeyOf<C>>(collection: C, keyPath: [K]): C;
declare function removeIn<C, K: $KeyOf<C>, K2: $KeyOf<$ValOf<C, K>>>(
  collection: C,
  keyPath: [K, K2]
): C;
declare function removeIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>
>(
  collection: C,
  keyPath: [K, K2, K3]
): C;
declare function removeIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>
>(
  collection: C,
  keyPath: [K, K2, K3, K4]
): C;
declare function removeIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>>
>(
  collection: C,
  keyPath: [K, K2, K3, K4, K5]
): C;

declare function setIn<S>(collection: Object, keyPath: [], value: S): S;
declare function setIn<C, K: $KeyOf<C>, S: $ValOf<C, K>>(
  collection: C,
  keyPath: [K],
  value: S
): C;
declare function setIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  S: $ValOf<$ValOf<C, K>, K2>
>(
  collection: C,
  keyPath: [K, K2],
  value: S
): C;
declare function setIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  S: $ValOf<$ValOf<$ValOf<C, K>, K2>, K3>
>(
  collection: C,
  keyPath: [K, K2, K3],
  value: S
): C;
declare function setIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  S: $ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>
>(
  collection: C,
  keyPath: [K, K2, K3, K4],
  value: S
): C;
declare function setIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>>,
  S: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>, K5>
>(
  collection: C,
  keyPath: [K, K2, K3, K4, K5],
  value: S
): C;

declare function updateIn<C, S>(
  collection: C,
  keyPath: [],
  notSetValue: mixed,
  updater: (value: C) => S
): S;
declare function updateIn<C, S>(
  collection: C,
  keyPath: [],
  updater: (value: C) => S
): S;
declare function updateIn<C, K: $KeyOf<C>, S: $ValOf<C, K>, NSV>(
  collection: C,
  keyPath: [K],
  notSetValue: NSV,
  updater: (value: $ValOf<C, K> | NSV) => S
): C;
declare function updateIn<C, K: $KeyOf<C>, S: $ValOf<C, K>>(
  collection: C,
  keyPath: [K],
  updater: (value: $ValOf<C, K>) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  S: $ValOf<$ValOf<C, K>, K2>,
  NSV
>(
  collection: C,
  keyPath: [K, K2],
  notSetValue: NSV,
  updater: (value: $ValOf<$ValOf<C, K>, K2> | NSV) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  S: $ValOf<$ValOf<C, K>, K2>
>(
  collection: C,
  keyPath: [K, K2],
  updater: (value: $ValOf<$ValOf<C, K>, K2>) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  S: $ValOf<$ValOf<$ValOf<C, K>, K2>, K3>,
  NSV
>(
  collection: C,
  keyPath: [K, K2, K3],
  notSetValue: NSV,
  updater: (value: $ValOf<$ValOf<$ValOf<C, K>, K2>, K3> | NSV) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  S: $ValOf<$ValOf<$ValOf<C, K>, K2>, K3>
>(
  collection: C,
  keyPath: [K, K2, K3],
  updater: (value: $ValOf<$ValOf<$ValOf<C, K>, K2>, K3>) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  S: $ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>,
  NSV
>(
  collection: C,
  keyPath: [K, K2, K3, K4],
  notSetValue: NSV,
  updater: (value: $ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4> | NSV) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  S: $ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>
>(
  collection: C,
  keyPath: [K, K2, K3, K4],
  updater: (value: $ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>>,
  S: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>, K5>,
  NSV
>(
  collection: C,
  keyPath: [K, K2, K3, K4, K5],
  notSetValue: NSV,
  updater: (
    value: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>, K5> | NSV
  ) => S
): C;
declare function updateIn<
  C,
  K: $KeyOf<C>,
  K2: $KeyOf<$ValOf<C, K>>,
  K3: $KeyOf<$ValOf<$ValOf<C, K>, K2>>,
  K4: $KeyOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>>,
  K5: $KeyOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>>,
  S: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>, K5>
>(
  collection: C,
  keyPath: [K, K2, K3, K4, K5],
  updater: (
    value: $ValOf<$ValOf<$ValOf<$ValOf<$ValOf<C, K>, K2>, K3>, K4>, K5>
  ) => S
): C;

declare function merge<C>(
  collection: C,
  ...collections: Array<
    | $IterableOf<C>
    | $Shape<RecordValues<C>>
    | PlainObjInput<$KeyOf<C>, $ValOf<C>>
  >
): C;
declare function mergeWith<C>(
  merger: (oldVal: $ValOf<C>, newVal: $ValOf<C>, key: $KeyOf<C>) => $ValOf<C>,
  collection: C,
  ...collections: Array<
    | $IterableOf<C>
    | $Shape<RecordValues<C>>
    | PlainObjInput<$KeyOf<C>, $ValOf<C>>
  >
): C;
declare function mergeDeep<C>(
  collection: C,
  ...collections: Array<
    | $IterableOf<C>
    | $Shape<RecordValues<C>>
    | PlainObjInput<$KeyOf<C>, $ValOf<C>>
  >
): C;
declare function mergeDeepWith<C>(
  merger: (oldVal: any, newVal: any, key: any) => mixed,
  collection: C,
  ...collections: Array<
    | $IterableOf<C>
    | $Shape<RecordValues<C>>
    | PlainObjInput<$KeyOf<C>, $ValOf<C>>
  >
): C;

export {
  Collection,
  Seq,
  List,
  Map,
  OrderedMap,
  OrderedSet,
  Range,
  Repeat,
  Record,
  Set,
  Stack,
  fromJS,
  is,
  hash,
  isImmutable,
  isCollection,
  isKeyed,
  isIndexed,
  isAssociative,
  isOrdered,
  isRecord,
  isValueObject,
  get,
  has,
  remove,
  set,
  update,
  getIn,
  hasIn,
  removeIn,
  setIn,
  updateIn,
  merge,
  mergeWith,
  mergeDeep,
  mergeDeepWith,
};

export default {
  Collection,
  Seq,

  List,
  Map,
  OrderedMap,
  OrderedSet,
  PairSorting,
  Range,
  Repeat,
  Record,
  Set,
  Stack,

  fromJS,
  is,
  hash,

  isImmutable,
  isCollection,
  isKeyed,
  isIndexed,
  isAssociative,
  isOrdered,
  isRecord,
  isValueObject,

  get,
  has,
  remove,
  set,
  update,
  getIn,
  hasIn,
  removeIn,
  setIn,
  updateIn,
  merge,
  mergeWith,
  mergeDeep,
  mergeDeepWith,
};

export type {
  Comparator,
  KeyedCollection,
  IndexedCollection,
  SetCollection,
  KeyedSeq,
  IndexedSeq,
  SetSeq,
  RecordFactory,
  RecordOf,
  RecordInstance,
  ValueObject,
  $KeyOf,
  $ValOf,
};
Youez - 2016 - github.com/yon3zu
LinuXploit