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/** * A callback function that accepts an error or a result. * @public */ export interface Callback<T> { (error: Error, result?: never): void; (error: null, result: T): void; } /** * A callback function that only accepts an error. * @public */ export interface ErrorCallback { (error: Error | null): void; } /** * The inverse of NonNullable<T>. * @public */ export type Nullable<T> = T | null | undefined; /** Wrapped `Object.prototype.toString`, so that you don't need to remember to use `.call()`. */ export declare const objectToString: (obj: unknown) => string; /** Safely converts any value to string, using the value's own `toString` when available. */ export declare const safeToString: (val: unknown) => string; /** Utility object for promise/callback interop. */ export interface PromiseCallback<T> { promise: Promise<T>; callback: Callback<T>; resolve: (value: T) => Promise<T>; reject: (error: Error) => Promise<T>; } /** Converts a callback into a utility object where either a callback or a promise can be used. */ export declare function createPromiseCallback<T>(cb?: Callback<T>): PromiseCallback<T>; export declare function inOperator<K extends string, T extends object>(k: K, o: T): o is T & Record<K, unknown>;