before
evalmachine.<anonymous>:1
foo.bar = 5;
^

ReferenceError: foo is not defined
    at evalmachine.<anonymous>:1:1
    at Script.runInContext (vm.js:*)
    at Script.runInNewContext (vm.js:*)
    at Object.runInNewContext (vm.js:*)
    at Object.<anonymous> (*test*message*undefined_reference_in_new_context.js:*)
    at Module._compile (internal/modules/cjs/loader.js:*)
    at *..js (internal/modules/cjs/loader.js:*)
    at Module.load (internal/modules/cjs/loader.js:*)
    at tryModuleLoad (internal/modules/cjs/loader.js:*:*)
    at Function.Module._load (internal/modules/cjs/loader.js:*:*)