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Allows you to specify a list of #define directives which controls whether your plug-in should be included.
You can set this property on each plug-in to control whether it should or shouldn't be included in your build according to the currently defined define directives.
By specifying the names of one or more #define directives in an array in this property on your plug-in, you can specify that your plug-in should only be included in the build when your project defines one of those #define directives.
Each plug-in in your project can have its own unique array of define constraints. This way, you can have different plug-ins included or excluded when you publish different types of builds, by changing which #define directives are set when you build.
You can use the "!" character to specify that a plug-in should be included only when a certain #define directive is not set in the currently defined define directives. For example, including "!ExampleDefine" in the list of define constraints means that the plug-in will not be included if "ExampleDefine" is set in the project's define directives.
Note: There is a similar feature which allows you to conditionally control which script assemblies are included. For more information, see the Script Assemblies Manual Page.