Gulp さんぷるこーど　いろいろ

var gulp = require("gulp");
var del = require("del");
var rename = require("gulp-rename");
var concat = require("gulp-concat");
var uglify = require("gulp-uglify");
var sass = require("gulp-sass")

var copyTask = async function () {
    return gulp.src("./src/sample1.txt")
        .pipe(gulp.dest("./dist"));
};

var delTask = async function () {
    return del("./dist/*");
};

var renameTask = async function () {
    gulp.src("./src/sample1.txt")
        .pipe(rename({ suffix: ".min" }))
        .pipe(gulp.dest("./dist"));
};
var concatTask = async function () {
    gulp.src(["sample1.txt", "sample2.txt"], { cwd: "./src" })
        .pipe(concat("bundle.txt"))
        .pipe(gulp.dest("./dist"));
};

var minifyTask = async function () {
    gulp.src("./src/sample1.js")
        .pipe(uglify())
        .pipe(gulp.dest("./dest"));
};

var minifyTask2 = async function () {
    gulp.src(["sample1.js", "sample2.js"], { cwd: "./src" })
        .pipe(concat("bundle.js"))
        .pipe(uglify())
        .pipe(rename({ suffix: ".min" }))
        .pipe(gulp.dest("./dist"));
};

var sassTask = async function () {
    gulp.src(["sample1.scss", "sample2.scss"], { cwd: "./src" })
        .pipe(concat("bundle.scss"))
        .pipe(sass({ outputStyle: "compressed" }))
        .pipe(rename({suffix: ".min"}))
        .pipe(gulp.dest("./dist"));
};

module.exports.default = sassTask;//minifyTask2;//concatTask;//renameTask;//delTask;//copyTask;