update node requires update gulp, breaks gulpfile.babel.js

[JamesNewton]

Upgrading node breaks gulp 3. 
 gulpjs/gulp#2324
gulp 4 is significantly different from 3 and requires significant changes to the gulpfile.babel.js file.

Sub plot:
For some reason, I had a heck of a time installing gulp 4.0, even npm update gulp -g gets me 3.9.1. And yes, I've completely uninstalled and re-installed. Finally found:
 lemonstand/lscloud-theme-bones#52
which shows npm install gulp@4 to which I added the --save-dev flag. That got the current gulp version 4, but as expected, this triggers a rash of problems.

The first is related to :
 gulpjs/undertaker#54
Because gulp.task(name, deps, func) was replaced by gulp.task(name, gulp.{series|parallel}(deps, func)). This requires updates to any tasks with a dep which must be carefully implemented:
 https://fettblog.eu/gulp-4-parallel-and-series/
There is only once case of a dep in the file, but updating it to:
gulp.task('watch-all', gulp.series('browserify-watch'), () => {
results in an error "Task never defined: browserify-watch" even though it is defined later in the file, because gulp 4 has issues with forward references.

Moving the section:

gulp.task('watch-all', gulp.series('browserify-watch'), () => {
 gulp.watch(paths.server, () => {
 gulp.start('build-server');
 });
});

To the end of the file resolves the issue and gulp -T shows the tree.

However, actually running gulp errors on line 27 with "gulp.hasTask is not a function". This requires all the runSequences to be converted to gulp.series. 
https://stackoverflow.com/questions/48513573/gulp-error-gulp-hastask-is-not-a-function
E.g.

gulp.task('default', function(cb) {
 run('server', 'build', 'restart', 'watch-all', cb);
});

becomes: gulp.task('default', gulp.series('server', 'build', 'restart', 'watch-all'), cb => cb())

But that then causes ALL the forward references to be an issue. 

Gulp 4 is a… bridge too far. Any ideas for a... simpler re-build system? Or can anyone who is used to this upgrade help with the file?