package.json 中的 phantomChildren 是什么？

Question

当我安装模块时，phantomChildren 的列表出现在 package.json 文件中。什么是 phantomChildren？

Answer 1

我没有找到 npm 软件包 phantomChildren 的官方文档。但是遇到了一些其他的解释：https://rushjs.io/pages/advanced/phantom_deps/。它是关于 rast，但很好地解释了 npm 依赖项的行为。

例如，库 A 可能会从库 B 和 C 导入定义，但是 B 和 C 都可以从 [=20 导入=]，这在这四个包之间创建了“钻石依赖关系”。

A “phantom dependency” occurs when a project uses a package that is not defined in its package.json file.

一些活生生的例子：

my-library/package.json

{
  "name": "my-library",
  "version": "1.0.0",
  "main": "lib/index.js",
  "dependencies": {
    "minimatch": "^3.0.4"
  },
  "devDependencies": {
    "rimraf": "^2.6.2"
  }
}

my-library/lib/index.js

var minimatch = require("minimatch")
var expand = require("brace-expansion");  // ???
var glob = require("glob")  // ???

Wait a sec – two of these libraries are not declared as dependencies in the package.json file. How is this working at all!? It turns out that brace-expansion is a dependency of minimatch, and glob is a dependency of rimraf. During installation, NPM has flattened their folders to be under my-library/node_modules. The NodeJS require() function finds them there because it probes for folders without considering the package.json files at all.

总结一下： 如果包使用它自己的依赖项的依赖项，它可以被视为 phantomChildren。包不直接有这样的依赖关系，而是从其他地方使用它。

package.json 中的 phantomChildren 是什么？

What are phantomChildren in package.json?

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