Skip to main content
Go to Latest
File
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.//// Adapted from Node.js. Copyright Joyent, Inc. and other Node contributors.//// Permission is hereby granted, free of charge, to any person obtaining a// copy of this software and associated documentation files (the// "Software"), to deal in the Software without restriction, including// without limitation the rights to use, copy, modify, merge, publish,// distribute, sublicense, and/or sell copies of the Software, and to permit// persons to whom the Software is furnished to do so, subject to the// following conditions://// The above copyright notice and this permission notice shall be included// in all copies or substantial portions of the Software.//// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE// USE OR OTHER DEALINGS IN THE SOFTWARE.
// These are simplified versions of the "real" errors in Node.
import { nextTick } from "../_next_tick.ts";
class NodeFalsyValueRejectionError extends Error { public reason: unknown; public code = "ERR_FALSY_VALUE_REJECTION"; constructor(reason: unknown) { super("Promise was rejected with falsy value"); this.reason = reason; }}class NodeInvalidArgTypeError extends TypeError { public code = "ERR_INVALID_ARG_TYPE"; constructor(argumentName: string) { super(`The ${argumentName} argument must be of type function.`); }}
type Callback<ResultT> = | ((err: Error) => void) | ((err: null, result: ResultT) => void);
function callbackify<ResultT>( fn: () => PromiseLike<ResultT>,): (callback: Callback<ResultT>) => void;function callbackify<ArgT, ResultT>( fn: (arg: ArgT) => PromiseLike<ResultT>,): (arg: ArgT, callback: Callback<ResultT>) => void;function callbackify<Arg1T, Arg2T, ResultT>( fn: (arg1: Arg1T, arg2: Arg2T) => PromiseLike<ResultT>,): (arg1: Arg1T, arg2: Arg2T, callback: Callback<ResultT>) => void;function callbackify<Arg1T, Arg2T, Arg3T, ResultT>( fn: (arg1: Arg1T, arg2: Arg2T, arg3: Arg3T) => PromiseLike<ResultT>,): (arg1: Arg1T, arg2: Arg2T, arg3: Arg3T, callback: Callback<ResultT>) => void;function callbackify<Arg1T, Arg2T, Arg3T, Arg4T, ResultT>( fn: ( arg1: Arg1T, arg2: Arg2T, arg3: Arg3T, arg4: Arg4T, ) => PromiseLike<ResultT>,): ( arg1: Arg1T, arg2: Arg2T, arg3: Arg3T, arg4: Arg4T, callback: Callback<ResultT>,) => void;function callbackify<Arg1T, Arg2T, Arg3T, Arg4T, Arg5T, ResultT>( fn: ( arg1: Arg1T, arg2: Arg2T, arg3: Arg3T, arg4: Arg4T, arg5: Arg5T, ) => PromiseLike<ResultT>,): ( arg1: Arg1T, arg2: Arg2T, arg3: Arg3T, arg4: Arg4T, arg5: Arg5T, callback: Callback<ResultT>,) => void;
function callbackify<ResultT>( original: (...args: unknown[]) => PromiseLike<ResultT>,): (...args: unknown[]) => void { if (typeof original !== "function") { throw new NodeInvalidArgTypeError('"original"'); }
const callbackified = function (this: unknown, ...args: unknown[]): void { const maybeCb = args.pop(); if (typeof maybeCb !== "function") { throw new NodeInvalidArgTypeError("last"); } const cb = (...args: unknown[]): void => { maybeCb.apply(this, args); }; original.apply(this, args).then( (ret: unknown) => { nextTick(cb.bind(this, null, ret)); }, (rej: unknown) => { rej = rej || new NodeFalsyValueRejectionError(rej); nextTick(cb.bind(this, rej)); }, ); };
const descriptors = Object.getOwnPropertyDescriptors(original); // It is possible to manipulate a functions `length` or `name` property. This // guards against the manipulation. if (typeof descriptors.length.value === "number") { descriptors.length.value++; } if (typeof descriptors.name.value === "string") { descriptors.name.value += "Callbackified"; } Object.defineProperties(callbackified, descriptors); return callbackified;}
export { callbackify };