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web/src/context/Status/reducer.js

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+export const reducer = (state, action) => {
+  switch (action.type) {
+    case 'set':
+      return {
+        ...state,
+        status: action.payload,
+      };
+    case 'unset':
+      return {
+        ...state,
+        status: undefined,
+      };
+    default:
+      return state;
+  }
+};
+
+export const initialState = {
+  status: undefined,
+};