javascript - Regarding the configuration problem of grunt plug-in browserify, please help

<code> browserify: {
      options: {
        transform: ['brfs'],
        debug: true
      },
      debug: {
        files: {'build/test.min.js': 'src/test.js'},  
      }
    }
    </code>

As long as you add transform: ['brfs'], an error will be reported. If you remove it, it will compile normally. What's going on?

<code>$ grunt
Running "browserify:debug" (browserify) task
>> TypeError: Cannot read property 'apply' of undefined while parsing file: X:\Users\javascript\Desktop\LEARN\learn_grunt\src\test.js
Warning: Error running grunt-browserify. Use --force to continue.

Aborted due to warnings.
</code>

Reply content:

<code> browserify: {
      options: {
        transform: ['brfs'],
        debug: true
      },
      debug: {
        files: {'build/test.min.js': 'src/test.js'},  
      }
    }
    </code>

As long as you add transform: ['brfs'], an error will be reported. If you remove it, it will compile normally. What's going on?

<code>$ grunt
Running "browserify:debug" (browserify) task
>> TypeError: Cannot read property 'apply' of undefined while parsing file: X:\Users\javascript\Desktop\LEARN\learn_grunt\src\test.js
Warning: Error running grunt-browserify. Use --force to continue.

Aborted due to warnings.
</code>