1 files changed, 31 insertions, 0 deletions

diff --git a/src/actions/lib/actions.ts b/src/actions/lib/actions.ts
new file mode 100644
index 000000000..ed42eabc0
--- /dev/null
+++ b/src/actions/lib/actions.ts
@@ -0,0 +1,31 @@
+export const createActionsFromDefinitions = (actionDefinitions, validate) => {
+  const actions = {};
+  Object.keys(actionDefinitions).forEach(actionName => {
+    const action = (params = {}) => {
+      const schema = actionDefinitions[actionName];
+      validate(schema, params, actionName);
+      action.notify(params);
+    };
+    actions[actionName] = action;
+    action.listeners = [];
+    action.listen = listener => action.listeners.push(listener);
+    action.off = listener => {
+      const { listeners } = action;
+      listeners.splice(listeners.indexOf(listener), 1);
+    };
+    action.notify = params =>
+      action.listeners.forEach(listener => listener(params));
+  });
+  return actions;
+};
+
+export default (definitions, validate) => {
+  const newActions = {};
+  Object.keys(definitions).forEach(scopeName => {
+    newActions[scopeName] = createActionsFromDefinitions(
+      definitions[scopeName],
+      validate,
+    );
+  });
+  return newActions;
+};