stdlazy/dist/ctor.d.ts

Flexible and debuggable lazy primitive.

import { Lazy } from "./lazy";
import { LazyAsync, Pulled } from "./types";
/**
 * Creates a lazy primitive around the given function, making sure it's only executed once. Works
 * for both synchronous and asynchronous evaluation.
 *
 * @example
 *     // Simple initializer:
 *     const regular = lazy(() => 1) satisfies Lazy<number>
 *
 *     // Initializer returning another lazily primitive is flattened:
 *     const lazyNested = lazy(() => lazy(() => 1)) satisfies Lazy<number>
 *
 *     // Async initializer gives a `LazyAsync` instance:
 *     const lazyAsync = lazy(async () => 1) satisfies LazyAsync<number>
 *
 *     // Async initializer returning another lazily primitive is flattened:
 *     const asyncLazy = lazy(async () => lazy(() => 1)) satisfies LazyAsync<number>
 *
 *     // Async initializer returning another lazily async primitive is flattened:
 *     const asyncLazyAsync = lazy(async () => lazy(async () => 1)) satisfies LazyAsync<number>
 *
 * @param initializer An initializer function that will be executed once to produce the value. Can
 *   be synchronous or asynchronous and will also handle nested lazy primitives.
 */
export declare function lazy<X>(initializer: () => Promise<LazyAsync<X>>): LazyAsync<X>;
export declare function lazy<X>(initializer: () => Promise<Lazy<X>>): LazyAsync<X>;
export declare function lazy<X>(initializer: () => Promise<X>): LazyAsync<X>;
export declare function lazy<T>(initializer: () => Lazy<T>): Lazy<T>;
export declare function lazy<T>(initializer: () => T): Lazy<T>;
/**
 * Memoizes the given function, caching its result and making sure it's only executed once. Uses
 * {@link Lazy} under the hood.
 *
 * @example
 *     // Synchronous memoization:
 *     let count = 0
 *     const func = () => count++
 *     const memFunc = memoize(func) satisfies () => number
 *     memFunc() // 0
 *     memFunc() // 0
 *     // Asynchronous memoization:
 *     let count = 0
 *     const func = async () => count++
 *     const memFunc = memoize(func) satisfies () => Promise<number>
 *     await memFunc() // 0
 *
 * @param definition The function to memoize. It can be synchronous, asynchronous, or return a lazy
 *   primitive.
 * @returns A function that will execute the memoized function and return its result.
 */
export declare function memoize<T>(definition: 0 extends 1 & T ? any : never): () => any;
export declare function memoize<T extends Lazy<Promise<any>>>(definition: () => T): () => Pulled<T>;
export declare function memoize<T extends Lazy<Promise<any>>>(definition: () => T): () => Pulled<T>;
export declare function memoize<T extends Lazy<any>>(definition: () => T): () => Pulled<T>;
export declare function memoize<T>(definition: () => T): () => T;
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