rollup.config.js

import resolve from "@rollup/plugin-node-resolve";
import terser from "@rollup/plugin-terser";
import typescript from "@rollup/plugin-typescript";
import replace from "@rollup/plugin-replace";
import { exec } from "child_process";
import { homedir } from "os";
import { promisify } from "util";

const options = {
    filename: "food-prefs.js",
    build: process.env.BUILD || "development",
};

async function getOutput() {
    if (options.build === "production") {
        return `./dist/${options.filename}`;
    }

    const platform = process.platform;
    const pluginPath = `OpenRCT2/plugin/${options.filename}`;

    if (platform === "win32") // Windows
    {
        const { stdout } = await promisify(exec)("powershell -command \"[Environment]::GetFolderPath('MyDocuments')\"");
        return `${stdout.trim()}/${pluginPath}`;
    } else if (platform === "darwin") // MacOS
    {
        return `${homedir()}/Library/Application Support/${pluginPath}`;
    } else // Linux
    {
        const configFolder = process.env.XDG_CONFIG_HOME || `${homedir()}/.config`;
        return `${configFolder}/${pluginPath}`;
    }
}

/**
 * @type {import("rollup").RollupOptions}
 */
const config = {
    input: "./src/plugin.ts",
    output: {
        file: await getOutput(),
        format: "iife",
        compact: true,
    },
    treeshake: "smallest",
    plugins: [
        resolve(),
        typescript(),
        replace({
            preventAssignment: true,
            _BUILD_ENVIRON_: options.build,
        }),
        terser({
            compress: {
                passes: 5,
                toplevel: true,
                unsafe: true,
            },
            format: {
                comments: false,
                quote_style: 1,
                wrap_iife: true,
                beautify: options.build !== "production",
            },
            mangle: {
                keep_fnames: options.build !== "production",
            },
        }),
    ],
};
export default config;