When Unity loads a project, the Unity Package Manager reads the project manifest so that it can compute a list of which packages to retrieve and load. When a user installs or uninstalls a package through the Package Manager window, the Package Manager stores those changes in the project manifest file. The project manifest file manages the list of packages through the dependencies object.

In addition, the project manifest serves as a configuration file for the Package Manager, which uses the manifest to customize the registry URL and register custom registries.

您可以在 Unity 项目根文件夹下的 Packages 文件夹中找到名为 manifest.json 的项目清单文件。与包清单文件类似，项目清单文件使用 JSON（JavaScript 对象表示法）语法。

属性

All properties are optional. However, if your project manifest file does not contain any values, the Package Manager window doesn’t load, and the Package Manager doesn’t load any packages.

Tip: At any time, you can fix any problems with your registry by choosing Reset packages to defaults from the main Unity Help menu. However, be aware that this action resets all changes you made to the dependencies of your project so it is best to do this as a last resort.

示例

{
  "registry": "https://my.registry.com",
  "scopedRegistries": [{
    "name": "My internal registry",
    "url": "https://my.internal.registry.com",
    "scopes": [
      "com.company"
    ]
  }],
  "dependencies": {
    "com.unity.package-1": "1.0.0",
    "com.unity.package-2": "2.0.0",
    "com.company.my-package": "3.0.0",
    "com.unity.my-local-package": "file:<path>/my_package_folder",
    "com.unity.my-local-tarball": "file:<path>/my_package_tarball.tgz",
    "com.unity.my-git-package": "https://my.repository/my-package.git#v1.2.3"
  },
  "enableLockFile": true,
  "resolutionStrategy": "highestMinor",
  "testables": [ "com.unity.package-1", "com.unity.package-2" ]
}

Setting a resolution strategy

While you can add package versions explicitly to the project manifest to override Unity’s package dependency resolution in order to upgrade indirect dependencies, this is not a very good strategy, for two reasons:

• It puts more responsibility on the project owner to maintain dependency versions.
• Over time, you might have dependencies that are not required by the project.

A better approach is to customize how the Package Manager selects indirect dependencies based on Semantic Versioning rules by setting the resolutionStrategy property:

Note: These ranges never allow a dependency to jump from a stable release to a preview package.