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

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