import { AfterContentChecked, AfterContentInit, AfterViewChecked, AfterViewInit, DoCheck, OnChanges, OnDestroy, OnInit } from '@angular/core';
import { Observable, Subject } from 'rxjs';
export declare const hookSubject: unique symbol;
export declare const hooksPatched: unique symbol;
export declare type AllHooks = OnChanges & OnInit & DoCheck & AfterContentInit & AfterContentChecked & AfterViewInit & AfterViewChecked & OnDestroy;
export declare type LifecycleHookKey = keyof AllHooks;
export interface TypedSimpleChange<Data> {
    previousValue: Data;
    currentValue: Data;
    firstChange: boolean;
}
/**
 * FIRST POINT:
 * the key is made optional because an ngOnChanges will only give keys of inputs that have changed
 * SECOND POINT:
 * the value is associated with `| null` as if an input value is defined but actually retrieved with
 * an `async` pipe, we'll initially get a `null` value
 *
 * For both point, feel free to check the following stackblitz that demo this
 * https://stackblitz.com/edit/stackblitz-starters-s5uphw?file=src%2Fmain.ts
 */
export declare type TypedSimpleChanges<Component, Keys extends keyof Component> = {
    [Key in Keys]?: TypedSimpleChange<Component[Key]> | null;
};
export declare type DecoratedHooks<Component = any, Keys extends keyof Component = any> = Record<Exclude<LifecycleHookKey, 'ngOnChanges'>, Observable<void>> & {
    ngOnChanges: Observable<TypedSimpleChanges<Component, Keys>>;
};
export declare type DecoratedHooksSub = {
    [k in keyof DecoratedHooks]: DecoratedHooks[k] extends Observable<infer U> ? Subject<U> : never;
};
/**
 * Library authors should use this to create their own lifecycle-aware functionality
 */
export declare function getObservableLifecycle<Component, Inputs extends keyof Component = never>(classInstance: Component): DecoratedHooks<Component, Inputs>;