// Without wrapAsync (callback style) function fetchData(callback) { setTimeout(() => callback(null, { user: 'alice' }), 100); } // With wrapAsync const syncFetch = Meteor.wrapAsync(fetchData); const result = syncFetch(); // Blocks until done console.log(result.user); // 'alice'
const readFileSync = Meteor.wrapAsync(fs.readFile); const content = readFileSync('/path/to/file', 'utf8'); But remember: in Meteor 3, just use fs.promises.readFile with await . Progress! ⚡
legacyLibrary.getData(id, (err, data) => { if (err) console.error(err); console.log(data); }); I wanted to use it inside a Meteor method without nesting. Solution: meteor wrapasync
#MeteorJS #WebDevelopment #AsyncProgramming Image text overlay: Meteor.wrapAsync(callbackFn) → turns callbacks into sync-style code
Wrap the function once outside the method to avoid re-wrapping on every call. // Modern Meteor 3 approach async function fetchData()
Now it returns the value directly (or throws an error). Perfect for server-side methods!
// Modern Meteor 3 approach async function fetchData() { return new Promise((resolve) => { setTimeout(() => resolve({ user: 'alice' }), 100); }); } const result = await fetchData(); Use wrapAsync for legacy callback-based npm packages, but prefer Promises + async/await in new code. { setTimeout(() =>
I had an npm library that only supports callbacks: