cannot read property 'apply' of undefined gulp

angularjs npm gulp npm-install gulp-sass

Try to reinstall gulp-cli :

npm install -g gulp-cli

angularjs npm gulp npm-install gulp-sass

npm install -g gulp-cli

And important: after running that command, open a new terminal so it'll take effect.

angularjs npm gulp npm-install gulp-sass

Upgrade to 4.0 like this:

npm install --save-dev github:gulpjs/gulp#4.0

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