import { BuildConfig, defineBuildConfig, build } from "unbuild";
import { merge, values } from "lodash-es";

// OR tsup

const BaseConfig = [
  {
    entries: ["src/index.ts"],
    declaration: true,
    rollup: {
      replace: {
        values: {
          __DEV__: "false",
          __PROD__: "true",
        },
      },
      emitCJS: true,
      output: {
        exports: "named",
      },
    },
  },
  {
    entries: [
      {
        input: "src/index.ts",
        ext: "cjs",
      },
    ],
    outDir: "dist/cjs/",
    rollup: {
      replace: {
        values: {
          __DEV__: "false",
          __PROD__: "true",
        },
      },
      output: {
        dir: "dist/cjs",
        entryFileNames: "[name].cjs",
        format: "cjs",
        preserveModules: true,
        preserveModulesRoot: "src",
        exports: "named",
      },
    },
  },
  {
    entries: [
      {
        input: "src/index.ts",
        ext: "mjs",
      },
    ],
    outDir: "dist/esm/",
    rollup: {
      replace: {
        values: {
          __DEV__: "false",
          __PROD__: "true",
        },
      },
      output: {
        preserveModules: true,
        preserveModulesRoot: "src",
        format: "esm",
        exports: "named",
      },
    },
  },
] as BuildConfig[];

export function mergeConfig(targetConfig: BuildConfig) {
  return defineBuildConfig(BaseConfig);
}