Cannot set `format` via `bili.config.js`

[ULIVZ]

Step to reproduce

// bili.config.js
module.exports = {
  output: {
    moduleName: 'checkDowngrade',
    fileName: 'checkDowngrade.[format][min].js'
  },
  format: [
    'esm',
    'umd',
    'cjs',
    'cjs-min',
  ]
};

Buiild output:

[EGOIST]

output.format, you can use bili.config.ts to prevent from using unknown options: https://bili.egoist.sh/#/configuration-file#typescript

[ULIVZ]

Cool~