# valid-services-property Ensures that accesses of properties of items accessed via the `Services` object are valid. This rule requires a full build to run, and is not turned on by default. To run this rule manually, use: ```console MOZ_OBJDIR=objdir-ff-opt ./mach eslint --rule="mozilla/valid-services-property: error" * ``` ## Examples of incorrect code for this rule Assuming `foo` is not defined within `Ci.nsIIOService`. ```js Services.io.foo(); ``` ## Examples of correct code for this rule Assuming `bar` is defined within `Ci.nsIIOService`. ```js Services.io.bar(); ```