denoland-deno/std/node/_util/_util_callbackify.ts

// Copyright 2018-2020 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.
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;

// deno-lint-ignore no-explicit-any
function callbackify(original: any): any {
  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) => {
        queueMicrotask(cb.bind(this, null, ret));
      },
      (rej: unknown) => {
        rej = rej || new NodeFalsyValueRejectionError(rej);
        queueMicrotask(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 };