Meteor Wrapasync Patched Jun 2026

let result = Meteor.wrapAsync((cb) => { setTimeout(() => cb(null, 'Done'), 1000); })();

In this example, Meteor.wrapAsync is used to convert the fs.readFile function into a synchronous function. The readFile function now blocks until the file is read, and then returns the file content.

wrapAsync ​ It is no longer necessary, you can use async/await directly in your code. javascript // Before const wrappedFunction = What's going on with Meteor and Fibers/bindEnvironment()? meteor wrapasync

Historically, Meteor relied on to avoid "callback hell". Most Meteor functions (like Collection.find() ) ran synchronously because they were wrapped in Fibers. When you used a 3rd-party NPM library that used callbacks, you would hit the infamous "Meteor code must always run within a Fiber" error. Meteor.wrapAsync solves this by:

Meteor.methods({ 'getData'(id) { const syncGetData = Meteor.wrapAsync(legacyLibrary.getData); return syncGetData(id); } }); let result = Meteor

I had an npm library that only supports callbacks:

Understanding Meteor.wrapAsync in Meteor.js javascript // Before const wrappedFunction = What's going

Meteor.wrapAsync is a powerful utility designed to transform standard Node.js-style asynchronous functions into "synchronous-looking" code that runs within Meteor's Fiber-based environment. 1. The Core Purpose Traditionally, Node.js uses callbacks to handle asynchronous tasks. Meteor, however, was built to allow developers to write code in a linear, procedural style on the server (using Fibers) without getting lost in "callback hell".