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// https://github.com/microsoft/TypeScript/issues/40462#issuecomment-689879308
/// <reference lib="esnext.asynciterable" />
import { Observable } from './Observable';
import { Subscription } from './Subscription';
/**
* Note: This will add Symbol.observable globally for all TypeScript users,
* however, we are no longer polyfilling Symbol.observable
*/
declare global {
interface SymbolConstructor {
readonly observable: symbol;
}
}
/* OPERATOR INTERFACES */
/**
* A function type interface that describes a function that accepts one parameter `T`
* and returns another parameter `R`.
*
* Usually used to describe {@link OperatorFunction} - it always takes a single
* parameter (the source Observable) and returns another Observable.
*/
export interface UnaryFunction<T, R> {
(source: T): R;
}
export interface OperatorFunction<T, R> extends UnaryFunction<Observable<T>, Observable<R>> {}
export type FactoryOrValue<T> = T | (() => T);
/**
* A function type interface that describes a function that accepts and returns a parameter of the same type.
*
* Used to describe {@link OperatorFunction} with the only one type: `OperatorFunction<T, T>`.
*
*/
export interface MonoTypeOperatorFunction<T> extends OperatorFunction<T, T> {}
/**
* A value and the time at which it was emitted.
*
* Emitted by the `timestamp` operator
*
* @see {@link timestamp}
*/
export interface Timestamp<T> {
value: T;
/**
* The timestamp. By default, this is in epoch milliseconds.
* Could vary based on the timestamp provider passed to the operator.
*/
timestamp: number;
}
/**
* A value emitted and the amount of time since the last value was emitted.
*
* Emitted by the `timeInterval` operator.
*
* @see {@link timeInterval}
*/
export interface TimeInterval<T> {
value: T;
/**
* The amount of time between this value's emission and the previous value's emission.
* If this is the first emitted value, then it will be the amount of time since subscription
* started.
*/
interval: number;
}
/* SUBSCRIPTION INTERFACES */
export interface Unsubscribable {
unsubscribe(): void;
}
export type TeardownLogic = Subscription | Unsubscribable | (() => void) | void;
export interface SubscriptionLike extends Unsubscribable {
unsubscribe(): void;
readonly closed: boolean;
}
/**
* @deprecated Do not use. Most likely you want to use `ObservableInput`. Will be removed in v8.
*/
export type SubscribableOrPromise<T> = Subscribable<T> | Subscribable<never> | PromiseLike<T> | InteropObservable<T>;
/** OBSERVABLE INTERFACES */
export interface Subscribable<T> {
subscribe(observer: Partial<Observer<T>>): Unsubscribable;
}
/**
* Valid types that can be converted to observables.
*/
export type ObservableInput<T> =
| Observable<T>
| InteropObservable<T>
| AsyncIterable<T>
| PromiseLike<T>
| ArrayLike<T>
| Iterable<T>
| ReadableStreamLike<T>;
/**
* @deprecated Renamed to {@link InteropObservable }. Will be removed in v8.
*/
export type ObservableLike<T> = InteropObservable<T>;
/**
* An object that implements the `Symbol.observable` interface.
*/
export interface InteropObservable<T> {
[Symbol.observable]: () => Subscribable<T>;
}
/* NOTIFICATIONS */
/**
* A notification representing a "next" from an observable.
* Can be used with {@link dematerialize}.
*/
export interface NextNotification<T> {
/** The kind of notification. Always "N" */
kind: 'N';
/** The value of the notification. */
value: T;
}
/**
* A notification representing an "error" from an observable.
* Can be used with {@link dematerialize}.
*/
export interface ErrorNotification {
/** The kind of notification. Always "E" */
kind: 'E';
error: any;
}
/**
* A notification representing a "completion" from an observable.
* Can be used with {@link dematerialize}.
*/
export interface CompleteNotification {
kind: 'C';
}
/**
* Valid observable notification types.
*/
export type ObservableNotification<T> = NextNotification<T> | ErrorNotification | CompleteNotification;
/* OBSERVER INTERFACES */
export interface NextObserver<T> {
closed?: boolean;
next: (value: T) => void;
error?: (err: any) => void;
complete?: () => void;
}
export interface ErrorObserver<T> {
closed?: boolean;
next?: (value: T) => void;
error: (err: any) => void;
complete?: () => void;
}
export interface CompletionObserver<T> {
closed?: boolean;
next?: (value: T) => void;
error?: (err: any) => void;
complete: () => void;
}
export type PartialObserver<T> = NextObserver<T> | ErrorObserver<T> | CompletionObserver<T>;
/**
* An object interface that defines a set of callback functions a user can use to get
* notified of any set of {@link Observable}
* {@link guide/glossary-and-semantics#notification notification} events.
*
* For more info, please refer to {@link guide/observer this guide}.
*/
export interface Observer<T> {
/**
* A callback function that gets called by the producer during the subscription when
* the producer "has" the `value`. It won't be called if `error` or `complete` callback
* functions have been called, nor after the consumer has unsubscribed.
*
* For more info, please refer to {@link guide/glossary-and-semantics#next this guide}.
*/
next: (value: T) => void;
/**
* A callback function that gets called by the producer if and when it encountered a
* problem of any kind. The errored value will be provided through the `err` parameter.
* This callback can't be called more than one time, it can't be called if the
* `complete` callback function have been called previously, nor it can't be called if
* the consumer has unsubscribed.
*
* For more info, please refer to {@link guide/glossary-and-semantics#error this guide}.
*/
error: (err: any) => void;
/**
* A callback function that gets called by the producer if and when it has no more
* values to provide (by calling `next` callback function). This means that no error
* has happened. This callback can't be called more than one time, it can't be called
* if the `error` callback function have been called previously, nor it can't be called
* if the consumer has unsubscribed.
*
* For more info, please refer to {@link guide/glossary-and-semantics#complete this guide}.
*/
complete: () => void;
}
export interface SubjectLike<T> extends Observer<T>, Subscribable<T> {}
/* SCHEDULER INTERFACES */
export interface SchedulerLike extends TimestampProvider {
schedule<T>(work: (this: SchedulerAction<T>, state: T) => void, delay: number, state: T): Subscription;
schedule<T>(work: (this: SchedulerAction<T>, state?: T) => void, delay: number, state?: T): Subscription;
schedule<T>(work: (this: SchedulerAction<T>, state?: T) => void, delay?: number, state?: T): Subscription;
}
export interface SchedulerAction<T> extends Subscription {
schedule(state?: T, delay?: number): Subscription;
}
/**
* This is a type that provides a method to allow RxJS to create a numeric timestamp
*/
export interface TimestampProvider {
/**
* Returns a timestamp as a number.
*
* This is used by types like `ReplaySubject` or operators like `timestamp` to calculate
* the amount of time passed between events.
*/
now(): number;
}
/**
* Extracts the type from an `ObservableInput<any>`. If you have
* `O extends ObservableInput<any>` and you pass in `Observable<number>`, or
* `Promise<number>`, etc, it will type as `number`.
*/
export type ObservedValueOf<O> = O extends ObservableInput<infer T> ? T : never;
/**
* Extracts a union of element types from an `ObservableInput<any>[]`.
* If you have `O extends ObservableInput<any>[]` and you pass in
* `Observable<string>[]` or `Promise<string>[]` you would get
* back a type of `string`.
* If you pass in `[Observable<string>, Observable<number>]` you would
* get back a type of `string | number`.
*/
export type ObservedValueUnionFromArray<X> = X extends Array<ObservableInput<infer T>> ? T : never;
/**
* @deprecated Renamed to {@link ObservedValueUnionFromArray}. Will be removed in v8.
*/
export type ObservedValuesFromArray<X> = ObservedValueUnionFromArray<X>;
/**
* Extracts a tuple of element types from an `ObservableInput<any>[]`.
* If you have `O extends ObservableInput<any>[]` and you pass in
* `[Observable<string>, Observable<number>]` you would get back a type
* of `[string, number]`.
*/
export type ObservedValueTupleFromArray<X> = { [K in keyof X]: ObservedValueOf<X[K]> };
/**
* Used to infer types from arguments to functions like {@link forkJoin}.
* So that you can have `forkJoin([Observable<A>, PromiseLike<B>]): Observable<[A, B]>`
* et al.
*/
export type ObservableInputTuple<T> = {
[K in keyof T]: ObservableInput<T[K]>;
};
/**
* Constructs a new tuple with the specified type at the head.
* If you declare `Cons<A, [B, C]>` you will get back `[A, B, C]`.
*/
export type Cons<X, Y extends readonly any[]> = ((arg: X, ...rest: Y) => any) extends (...args: infer U) => any ? U : never;
/**
* Extracts the head of a tuple.
* If you declare `Head<[A, B, C]>` you will get back `A`.
*/
export type Head<X extends readonly any[]> = ((...args: X) => any) extends (arg: infer U, ...rest: any[]) => any ? U : never;
/**
* Extracts the tail of a tuple.
* If you declare `Tail<[A, B, C]>` you will get back `[B, C]`.
*/
export type Tail<X extends readonly any[]> = ((...args: X) => any) extends (arg: any, ...rest: infer U) => any ? U : never;
/**
* Extracts the generic value from an Array type.
* If you have `T extends Array<any>`, and pass a `string[]` to it,
* `ValueFromArray<T>` will return the actual type of `string`.
*/
export type ValueFromArray<A extends readonly unknown[]> = A extends Array<infer T> ? T : never;
/**
* Gets the value type from an {@link ObservableNotification}, if possible.
*/
export type ValueFromNotification<T> = T extends { kind: 'N' | 'E' | 'C' }
? T extends NextNotification<any>
? T extends { value: infer V }
? V
: undefined
: never
: never;
/**
* A simple type to represent a gamut of "falsy" values... with a notable exception:
* `NaN` is "falsy" however, it is not and cannot be typed via TypeScript. See
* comments here: https://github.com/microsoft/TypeScript/issues/28682#issuecomment-707142417
*/
export type Falsy = null | undefined | false | 0 | -0 | 0n | '';
export type TruthyTypesOf<T> = T extends Falsy ? never : T;
// We shouldn't rely on this type definition being available globally yet since it's
// not necessarily available in every TS environment.
interface ReadableStreamDefaultReaderLike<T> {
// HACK: As of TS 4.2.2, The provided types for the iterator results of a `ReadableStreamDefaultReader`
// are significantly different enough from `IteratorResult` as to cause compilation errors.
// The type at the time is `ReadableStreamDefaultReadResult`.
read(): PromiseLike<
| {
done: false;
value: T;
}
| { done: true; value?: undefined }
>;
releaseLock(): void;
}
/**
* The base signature RxJS will look for to identify and use
* a [ReadableStream](https://streams.spec.whatwg.org/#rs-class)
* as an {@link ObservableInput} source.
*/
export interface ReadableStreamLike<T> {
getReader(): ReadableStreamDefaultReaderLike<T>;
}
/**
* An observable with a `connect` method that is used to create a subscription
* to an underlying source, connecting it with all consumers via a multicast.
*/
export interface Connectable<T> extends Observable<T> {
/**
* (Idempotent) Calling this method will connect the underlying source observable to all subscribed consumers
* through an underlying {@link Subject}.
* @returns A subscription, that when unsubscribed, will "disconnect" the source from the connector subject,
* severing notifications to all consumers.
*/
connect(): Subscription;
}