aveazul/dist-esm/promisify.js

Bluebird drop-in replacement built on native Promise

import { copyOwnProperties, isPromisified } from "./util.js";
export function promisify(fn, _options) {
    if (typeof fn !== "function") {
        throw new TypeError("expecting a function but got " + {}.toString.call(fn));
    }
    if (isPromisified(fn)) {
        return fn;
    }
    const options = {
        Promise: globalThis.Promise,
        multiArgs: false,
        copyProps: true,
        suffix: "",
        context: undefined,
        ..._options,
    };
    const PromiseCtor = options.Promise;
    const multiArgs = !!options.multiArgs;
    const promisifiedFn = function (...args) {
        return new PromiseCtor((resolve, reject) => {
            // add a callback to the end of the arguments to transfer the result to the promise
            args.push(((err, ...values) => {
                if (err) {
                    return reject(err);
                }
                if (multiArgs) {
                    resolve(values);
                }
                else {
                    resolve(values[0]);
                }
            }));
            // call the original function with the updated args
            fn.call(options.context || this, ...args);
        });
    };
    if (options.copyProps) {
        copyOwnProperties(fn, promisifiedFn);
    }
    Object.defineProperty(promisifiedFn, "__isPromisified__", {
        value: true,
        writable: false,
        enumerable: false,
        configurable: true,
    });
    Object.defineProperty(promisifiedFn, "length", {
        value: fn.length,
        writable: false,
        enumerable: false,
        configurable: false,
    });
    Object.defineProperty(promisifiedFn, "name", {
        value: fn.name + options.suffix,
        writable: false,
        enumerable: false,
        configurable: false,
    });
    return promisifiedFn;
}
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