Method processChange

packages/jest-haste-map/src/watchers/NodeWatcher.js:277–317

* Process changes. * * @param {string} dir * @param {string} event * @param {string} file * @public

(dir, event, file)

   */

  processChange(dir, event, file) {
    const fullPath = path.join(dir, file);
    const relativePath = path.join(path.relative(this.root, dir), file);

    fs.lstat(fullPath, (error, stat) => {
      if (error && error.code !== 'ENOENT') {
        this.emit('error', error);
      } else if (!error && stat.isDirectory()) {
        // win32 emits usless change events on dirs.
        if (event !== 'change') {
          this.watchdir(fullPath);
          if (
            common.isFileIncluded(
              this.globs,
              this.dot,
              this.doIgnore,
              relativePath,
            )
          ) {
            this.emitEvent(ADD_EVENT, relativePath, stat);
          }
        }
      } else {
        const registered = this.registered(fullPath);
        if (error && error.code === 'ENOENT') {
          this.unregister(fullPath);
          this.stopWatching(fullPath);
          this.unregisterDir(fullPath);
          if (registered) {
            this.emitEvent(DELETE_EVENT, relativePath);
          }
        } else if (registered) {
          this.emitEvent(CHANGE_EVENT, relativePath, stat);
        } else {
          if (this.register(fullPath)) {
            this.emitEvent(ADD_EVENT, relativePath, stat);
          }
        }
      }
    });
  }

  /**
   * Triggers a 'change' event after debounding it to take care of duplicate