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