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'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = awaitify;
// conditionally promisify a function.
// only return a promise if a callback is omitted
function awaitify(asyncFn, arity) {
    if (!arity) arity = asyncFn.length;
    if (!arity) throw new Error('arity is undefined');
    function awaitable(...args) {
        if (typeof args[arity - 1] === 'function') {
            return asyncFn.apply(this, args);
        }

        return new Promise((resolve, reject) => {
            args[arity - 1] = (err, ...cbArgs) => {
                if (err) return reject(err);
                resolve(cbArgs.length > 1 ? cbArgs : cbArgs[0]);
            };
            asyncFn.apply(this, args);
        });
    }

    return awaitable;
}
module.exports = exports.default;