gulpfile.js

"use strict";

const { series, src, dest, watch } = require("gulp");
const sass = require("gulp-sass");
const autoprefixer = require("gulp-autoprefixer");
const cssmin = require("gulp-cssmin");

function transferSass() {
  return src("./packages/theme-chalk/*.scss")
    .pipe(sass.sync().on("error", sass.logError))
    .pipe(
      autoprefixer({
        overrideBrowserslist: ["ie > 9", "last 2 versions"],
        cascade: false,
      })
    )
    .pipe(cssmin())
    .pipe(dest("./packages/theme-chalk/lib"));
}
function copyToDist() {
  return src("./packages/theme-chalk/lib/*.**").pipe(dest("./lib/theme-chalk"));
}

exports.default = series(transferSass, copyToDist);

exports.w = function() {
  return watch(["./packages/theme-chalk/*.scss"], series(transferSass, copyToDist));
};