/home/8TSVML/prog.js:9
const handle = (state, action) => Object.assign({}, state, action.payload);
^
TypeError: Cannot read property 'payload' of undefined
at handle (/home/8TSVML/prog.js:9:66)
at Object.<anonymous> (/home/8TSVML/prog.js:11:13)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.runMain (module.js:605:10)
at run (bootstrap_node.js:420:7)
at startup (bootstrap_node.js:139:9)