npm run dist does not work but npm run build + npm run zip does

[msramalho]

I was unable to understand why, but the zip command only works properly if executed individually, otherwise only the manifest file is copied to the zipped versions.

[fabiodrg]

It seems the problem has to do with pipes being async. By the time the mergeAll returns, not all pipes are completed. Experiment:

function mergeAll(done) {
    pipe(...);
    pipe(...);
    ...
    setTimeout(function () {
        done()
    }, 5000);
}

The delay of 5 seconds before done() ensures all buffers and streams flushed (i.e. the destination files are created) before the task zip.
Not sure how to solve it, but will try to use Promises API.

[fabiodrg]

After inspecting in more detail, I think the most sensible option is to separate each move command (coping files from src/ to build/) to individual Gulp tasks.

I didn't find a method that lets return multiple streams. As per Gulp, a task can only return one stream. Moreover, I suspect Gulp uses synchronous Node.js streams, which don't allow me to use a Promisse.all() to handle all promises at once. Therefore, I would have to add event handlers to capture the stream closing/finishing, increment some counter, and when the counter is N, then all streams are flushed and the task can conclude.

const t1 = pipe('./src/css/**/*', `./build/${target}/css`);
t1.on('finish', () => console.log('Finish'));
...

That versus individual tasks per copy/move operation that can run in parallel, I think the latter is more sensible to be compliant with Gulp, faster to code and easier to read.