gulp@4.0.0-alpha.3 breaks gulp scripts with "Error: write callback called multiple times"

[ghost]

at afterTransform (PROJECT\node_modules\readable-stream\lib_stream_transform.js:96:33)
at TransformState.afterTransform (PROJECT\node_modules\readable-stream\lib_stream_transform.js:79:12)
at PROJECT\node_modules\gulp-requirejs-optimize\index.js:122:4
at PROJECT\node_modules\requirejs\bin\r.js:3059:39
at PROJECT\node_modules\requirejs\bin\r.js:2999:25
at Function.prim.nextTick (PROJECT\node_modules\requirejs\bin\r.js:28077:9)
at Object.errback (PROJECT\node_modules\requirejs\bin\r.js:2998:26)
at Object.callback (PROJECT\node_modules\requirejs\bin\r.js:2984:23)
at Object.then (PROJECT\node_modules\requirejs\bin\r.js:3038:23)
at runBuild (PROJECT\node_modules\requirejs\bin\r.js:30291:48)

[wlwr]

I have the same problem.

[phated]

@ArtemChornovol is there a reason you didn't use the PR template? Your stacktrace pretty clearly shows that the issue is in gulp-requirejs-optimize. I'm guessing they are calling the through2 callback more than once (hence "callback called multiple times")

I also noticed they are using gulp-util which is deprecated and the project seems unmaintained. You should probably use requirejs directly like I have done at https://github.com/phated/requirejs-example-gulpfile/blob/master/gulpfile.js