Async: what is a good pattern to wait for all iterations of async.eachLimit to finish before moving on?

[avieru]

question: bit new to async and have following code to download lots of files, 2 at about the same time

async.eachLimit(files, 2, async (file, callback) => {
     reportStep("downloading");
     console.log("async start: " + file.path);
     await addFile(file.path, file.size);
     console.log("async end: " + file.path);    
     callback();
 }) 
reportStep("completed")

Of course, "completed" quickly get's fired while async.eachLimit continues executing funcs.

What is a good way to wait for all the iterations to be done?

[avieru]

nvm, didn't read the docs close enough.

there is yet another callback param, ended up wrapping it up all up in a promise that i can await

function download(files) {
    return new Promise((resolve, reject) => {
async.eachLimit(files, 2, async (file, callback) => {
     reportStep("downloading");
     console.log("async start: " + file.path);
     await addFile(file.path, file.size);
     console.log("async end: " + file.path);    
     callback();
         }, (error) => {
            if (error){
                reject(error);
            } else {
                resolve();
            }
        })
    });
}

await download(files)

[hargasinski]

Side note, if you are using the prerelease of v3, you don't need the wrapper. eachLimit will return a promise if you don't pass the final callback.

[avieru]

hmm, I tried awaiting async.eachLimit but it wasn't working for some reason or another. Thats what prompted me to post here. I'll have to give it another shot.

[avalanche1]

Did you suceed? I'm facing the same - it simply doesnt wait for all iterations's promises to finish.