Problem installing gulp, how to solve?

Question

gulp.js

everything seems to be filled out correctly in galpfile.js, everything is in package.json but on the command line it displays

$ gulp scss
[20:32:44] Using gulpfile ~\Desktop\start__gilp\gulpfile.js
[20:32:44] Task never defined: scss
[20:32:44] To list available tasks, try running: gulp --tasks

if you type gulp --tasks, then Tasks for ~\Desktop\start__gilp\gulpfile.js is
empty(
is there an error somewhere in galpfile.js? Please help

galpfile.js

const { src, dest, series, parallel, watch } = require('gulp');
const sass = require('gulp-sass');

function scss() {
    return src("app/scss/style.scss")

    .pipe(sass())
    .pipe(dest("app/css/style.css"))
}

exports.scss = scss;

package.json

{
  "name": "start__gilp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Dasha Farbak",
  "license": "ISC",
  "devDependencies": {
    "gulp": "^4.0.2",
    "gulp-sass": "^5.0.0",
    "sass": "^1.35.1"
  }
}

Answer 1

That's right.

And everything works.

But if your file is called g a lpfile.js, then there may be a problem here.