import svelte from "rollup-plugin-svelte";
import resolve from "rollup-plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";
import scss from "rollup-plugin-scss";
import livereload from "rollup-plugin-livereload";
import { autoPreprocess } from "svelte-preprocess/dist/autoProcess";
import { terser } from "rollup-plugin-terser";
import del from "rollup-plugin-delete";

const production = !process.env.ROLLUP_WATCH;
const port = process.env.PORT;
const buildDir = "public/dist";

export default {
    input: "src/index.js",
    output: {
        name: "app",
        format: "esm",
        sourcemap: !production,
        dir: `${buildDir}`,
    },
    manualChunks(id) {
        if (id.includes("node_modules")) {
            return "vendor";
        }
    },
    plugins: [
        del({
            targets: "public/dist/*",
            runOnce: true,
        }),
        svelte({
            dev: !production,
            emitCss: true,
            preprocess: autoPreprocess({ postcss: true }),
        }),
        scss({ output: `${buildDir}/bundle.css` }),
        resolve({
            browser: true,
            dedupe: ["svelte"],
        }),
        commonjs(),
        !production &&
            livereload({
                watch: "public",
            }),
        production && terser(),
    ],

    watch: {
        clearScreen: false,
    },
};