text: // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
  "use strict";
  
  ((window) => {
    const core = window.Deno.core;
    const { errors } = window.__bootstrap.errors;
  
    class FsWatcher {
      #rid = 0;
  
      constructor(paths, options) {
        const { recursive } = options;
        this.#rid = core.jsonOpSync("op_fs_events_open", { recursive, paths });
      }
  
      get rid() {
        return this.#rid;
      }
  
      async next() {
        try {
          return await core.jsonOpAsync("op_fs_events_poll", {
            rid: this.rid,
          });
        } catch (error) {
          if (error instanceof errors.BadResource) {
            return { value: undefined, done: true };
          } else if (error instanceof errors.Interrupted) {
            return { value: undefined, done: true };
          }
          throw error;
        }
      }
  
      return(value) {
        core.close(this.rid);
        return Promise.resolve({ value, done: true });
      }
  
      [Symbol.asyncIterator]() {
        return this;
      }
    }
  
    function watchFs(
      paths,
      options = { recursive: true },
    ) {
      return new FsWatcher(Array.isArray(paths) ? paths : [paths], options);
    }
  
    window.__bootstrap.fsEvents = {
      watchFs,
    };
  })(this);
  