What's the use of webpack aliasfields?

Business background

in the process of using mpvue
found that his webpack configuration file contains the following line of code

  ...
  resolve: {
    ...
    aliasFields: ["mpvue", "weapp", "browser"],
  },

situation description

went to the official website to search, but it was relatively brief, and I didn"t understand

official link to an English document https://github.com/defunctzom.
probably took a look at it, but I don"t quite understand

my question

does his browser have to be configured in package.json before it takes effect?
is equivalent to that if the content of alias is too complicated, can you separate it by aliasFields ?

Webpack

Nov.29,2021

answer to question 1
the default value for aliasFields is ['browser'], so as long as the package.json of the referenced module has a browser field, webpack packages the module with an "alias" defined using the browser field. In a nutshell, the browser can only be produced in the package.json configuration of the referenced module, and only for this module .

answer to question 2
alias can be thought of as a global alias configuration, which replaces not only the source code of the project, but also the module referenced by it.

The content of

alias is too complex, so you can extract it through aliasFields and write it separately

it is not a big problem to elaborate on this point of view. But one thing to be clear is that aliasFields points to the package.json of the module rather than the pakcage.json of the current project.

To make a long story short, the difference between alias and aliasFields should be in scope. AliasFields can do fine granulation treatment.

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