JS / Node try catch (avoid breaking on error)

Question

I have a function in node.js which copies a file from on folder to another:

function copyfile(source,target) {
 try {
 fs.createReadStream(source).pipe(fs.createWriteStream(target));
 } 
 catch(err) {
 console.log(`There was an error - ${err}`);
 }
}
copyfile('source/134.txt', 'target/1b.txt');

File 134.txt does not exists so I was hoping I would get the error in the catch area but I'm getting this instead:

events.js:183 throw er; // Unhandled 'error' event

How can I change it so I get the specified error and not break like it's doing now?

Answer 1

You need attach on error event to every stream:

function copyfile(source, target) {
 fs.createReadStream(source).on('error', function (e) {
 console.log(e)
 }).pipe(fs.createWriteStream(target).on('error', function (e) {
 console.log(e)
 }))
}

if can use node10+ have other nice solution