background - introduce ObservableStore

1 files changed, 13 insertions, 0 deletions

diff --git a/app/scripts/lib/observable/util/transform.js b/app/scripts/lib/observable/util/transform.js
new file mode 100644
index 000000000..87946f402
--- /dev/null
+++ b/app/scripts/lib/observable/util/transform.js
@@ -0,0 +1,13 @@
+
+module.exports = transformStore
+
+
+function transformStore(inStore, outStore, stateTransform) {
+  const initState = stateTransform(inStore.get())
+  outStore.put(initState)
+  inStore.subscribe((inState) => {
+    const outState = stateTransform(inState)
+    outStore.put(outState)
+  })
+  return outStore
+}
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