2 files changed, 23 insertions, 0 deletions
diff --git a/src/data/composite/things/flash/index.js b/src/data/composite/things/flash/index.js
new file mode 100644
index 00000000..63ac13da
--- /dev/null
+++ b/src/data/composite/things/flash/index.js
@@ -0,0 +1 @@
+export {default as withFlashAct} from './withFlashAct.js';
diff --git a/src/data/composite/things/flash/withFlashAct.js b/src/data/composite/things/flash/withFlashAct.js
new file mode 100644
index 00000000..87922aff
--- /dev/null
+++ b/src/data/composite/things/flash/withFlashAct.js
@@ -0,0 +1,22 @@
+// Gets the flash's act. This will early exit if flashActData is missing.
+// If there's no flash whose list of flashes includes this flash, the output
+// dependency will be null.
+
+import {templateCompositeFrom} from '#composite';
+
+import {withUniqueReferencingThing} from '#composite/wiki-data';
+import {soupyReverse} from '#composite/wiki-properties';
+
+export default templateCompositeFrom({
+  annotation: `withFlashAct`,
+
+  outputs: ['#flashAct'],
+
+  steps: () => [
+    withUniqueReferencingThing({
+      reverse: soupyReverse.input('flashActsWhoseFlashesInclude'),
+    }).outputs({
+      ['#uniqueReferencingThing']: '#flashAct',
+    }),
+  ],
+});