import type { Plugin, TransformResult, ModuleOptions } from "rollup";

const isRegExp = (obj: unknown) => {
  return Object.prototype.toString.call(obj) === "[object RegExp]";
};

const OPTIONS: Partial<ModuleOptions> = {
  moduleSideEffects: "no-treeshake",
};

/**
 * Disable tree-shaking for specific files
 * @param options{Object=}
 * @returns {Plugin}
 */
export default function DisableTreeShakingPlugin(options: { patterns: (string | RegExp)[]; }): Plugin {

  const {
    patterns = [],
  } = options;

  return {
    name: "disable-treeShaking",
    cacheKey: "disable-treeShaking",
    transform(code, id): TransformResult {
      if (typeof id === "string" && patterns
        .filter((pattern) => !!pattern)
        .some((pattern) => {
          if (isRegExp(pattern)) {
            return (pattern as RegExp).test(id);
          } else {
            return id.includes(pattern as string);
          }
        })) {
        // console.debug(`[DisableTreeShakingPlugin] Exclude "${id}"`);
        return OPTIONS;
      }
    },
  };

}