@Incremental
                abstract DirectoryProperty getInput()
                @OutputFile
                File output

                @TaskAction
                void doStuff(InputChanges changes) {
                    def changed = changes.getFileChanges(input)*.file*.name as List
                    assert changed.contains('child')
                    output.text = changed.join('\\n')

                    }
                    throw new NullPointerException("Busted")
                }

                @OutputFile File outputFile

                @TaskAction
                void doStuff() {
                    executed = true
                }
            }

            task custom(type: CustomTask) {
                outputFile = file("output.txt")
            }
        """

    static class ClassWithNonRuleMethods extends RuleSource {
        static List thing() {
            []
        }

        static <T> List<T> genericThing() {
            []
        }

        private doStuff() {}

        private <T> T selectThing(List<T> list) { null }
    }

    def "can have non-rule methods that would be invalid rules"() {
        expect:
        extract(ClassWithNonRuleMethods).empty
    }

$ mkdir mycomponent
```

You'll then need to define your component's API.

```go
package mycomponent

type Instance interface {
    resource.Resource

    DoStuff() error
    DoStuffOrFail(t test.Failer)
}
```

 * be read and updated. Only the initial declaration that needs to be done via the namespace.
 *
 * <pre>
 * project.ext.prop1 = "foo"
 * task doStuff {
 *     ext.prop2 = "bar"
 * }
 * subprojects { ext.${prop3} = false }
 * </pre>
 *
 * Reading extra properties is done through the &quot;ext&quot; or through the owning object.
 *
 * <pre>