why is npm liabrary is not a function?

There is a problem with npm library for html minify. I downloaded and declared a library

import htmlmin from 'html-minifier'; 

but when i try to run a gulp task

export const html = () => {
  return gulp.src("source/*.html")
    .pipe(htmlmin({ collapseWhitespace: true }))
    .pipe(gulp.dest("build"));

}
but a got an error

TypeError: htmlmin is not a function

I am pretty sure there is no syntax error but I dont know what is a problem.

I tried different liabraries and more old node.js but I still got same problem