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import type { RollupWatcher, RollupWatchOptions } from "./mod.ts";import { EventEmitter } from "../../deps.ts";import { Watcher } from "./watcher.ts";import { ensureArray } from "../ensureArray.ts";import { handleError } from "../logging.ts";
/** * WatchEmitter * * @private */class WatchEmitter extends EventEmitter {  constructor() {    super();    this.setMaxListeners(Infinity);  }
  close() {}}
/** * watch * * The `watch` function rebuilds your bundle when it detects that the * individual modules have changed on disk. It is used internally when * you run Rollup from the command line with the `--watch` flag. Note * that when using watch mode via the JavaScript API, it is your * responsibility to call `event.result.close()` in response to the * `BUNDLE_END` event to allow plugins to clean up resources in the * `closeBundle` hook. * * @param {RollupWatchOptions|RollupWatchOptions[]} config * @returns {RollupWatcher} * @public */export function watch(  config: RollupWatchOptions | RollupWatchOptions[],): RollupWatcher {  const emitter = new WatchEmitter() as RollupWatcher;  const configArray = ensureArray(config);  const watchConfigs = configArray.filter((config) => config.watch !== false);
  if (!watchConfigs.length) {    throw handleError({      message:        `Invalid value for option "watch" - there must be at least one config where "watch" is not set to "false".`,    });  }
  new Watcher(watchConfigs, emitter);
  return emitter;}