import { dirname, resolve } from "node:path";
import { fileURLToPath } from "node:url";
import { defineConfig } from "vite";

const __dirname = dirname(fileURLToPath(import.meta.url));

// 声明文件单独由 `tsc -p tsconfig.dts.json` 产出（比 vite-plugin-dts 快一个数量级）
export default defineConfig({
    build: {
        lib: {
            entry: resolve(__dirname, "src/index.ts"),
            formats: ["es"],
            fileName: "index",
        },
        rollupOptions: {
            external: [
                "@app/danmaku",
                "@app/dao",
                "@app/db",
                "@app/models",
                "@app/types",
                "@trpc/server",
                "drizzle-orm",
                // webdav 的 createReadStream 依赖 Node stream；打成 bundle 会把
                // `import Stream from "stream"` 掏成空模块，导致 PassThrough is not a constructor
                "webdav",
                "stream",
                /node:.*/,
            ],
            output: {
                entryFileNames: "[name].js",
                chunkFileNames: "[name].js",
            },
        },
        // 只清 JS 产物：若 emptyOutDir=true 会先删掉 tsc 刚写的 .d.ts（构建顺序是 vite → tsc）
        outDir: "dist",
        emptyOutDir: false,
        commonjsOptions: {
            transformMixedEsModules: true,
        },
    },
});