I am trying to use the gulpfile.js to convert the sass file to css file but it can't work

Question

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it tried typing gulp to build up the js file and compile it to create a new index.css file

Answer 1

Install gulp globally using command

npm install -g gulp

Then Install gulp locally inside your project folder:

npm install gulp --save-dev

Then run

npm gulp

The key step is to first install gulp globally.