Object Descriptors & Property Flags

What results from redefining a non-writable but configurable property?

const user = {};

Object.defineProperty(user, 'name', {
  value: 'John',
  writable: false,
  configurable: true
});

Object.defineProperty(user, 'name', {
  value: 'Jane'
});

console.log(user.name);

'John'
'Jane'
The console will log 'Jane' because: 1) The initial property is defined as non-writable (writable: false), 2) However, it is also defined as configurable (configurable: true), 3) When a property is configurable, its entire descriptor can be redefined, 4) The second defineProperty() call redefines the property with a new value, 5) This bypasses the writable restriction through complete redefinition, 6) This demonstrates that configurability supersedes writability in terms of allowing value changes, 7) This behavior highlights why making truly immutable properties requires both writable: false and configurable: false.
undefined
Error will be thrown

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