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How I use prefixer in Lab 5.1?

I could not find "prefixer" in npm.
Should I define and create prefixer, my own function?
↓Must be wrong one in npm
"Prefix all rules in a CSS file
This library just packages up Substack's css-prefix library into an executable."
'use strict'
const sayHiTo = prefixer('Hello ')
const sayByeTo = prefixer('Goodbye ')
console.log(sayHiTo('Dave')) // prints 'Hello Dave'
console.log(sayHiTo('Annie')) // prints 'Hello Annie'
console.log(sayByeTo('Dave')) // prints 'Goodbye Dav'
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Comments
@SyuheiSaito quoted from Labs 5.1 :
The exercise is for you to define and create the prefixer function.