为什么我本地测试的结果--no-foo会覆盖事先定义的--foo

[ghost]

直接copy文档上的例子。本地测试结果如下：
--no-cheese和--cheese（有默认值），如果后定义--cheese，打印program.cheese，那么结果是默认值。如果后定义--no-cheese，打印program.cheese，那么结果是true
如果只设置了--cheese(无默认值)，执行node index pizza-options打印program.cheese，结果是undefined

[shadowspawn]

What is your code, and what are you trying? I tried this:

const { program } = require('commander');

program
  .option('--cheese <flavour>', 'cheese flavour', 'mozzarella')
  .option('--no-cheese', 'plain with no cheese');
  
program.parse();

console.log(program.cheese);

% node index.js 
mozzarella
% node index.js --cheese blue
blue
% node index.js --no-cheese  
false
% node index.js --cheese blue --no-cheese
false
% node index.js --no-cheese --cheese=blue
blue

[ghost]

sorry，I just now found the cause of the error。
my project's commander package version is 2.20.0 and resulting in incorrect default values。
when i update it，the result is corret。
Thank you for answering my childish question

[shadowspawn]

Glad you worked it out. Thanks for explaining.

There were good improvements released in Commander v3 from #795, collected items in #939.