Which package?

intl-messageformat

Describe the bug

With a message containing a select clause, when a IntlMessageFormat#format is called with values object that contains a string constructor as the value of the field on which the selection is done, it throws a error like this:

TypeError: Cannot read properties of undefined (reading 'length')
    at formatToParts (/path/to/project/node_modules/intl-messageformat/src/formatters.js:40:13)
    at formatToParts (/path/to/project/node_modules/intl-messageformat/src/formatters.js:165:39)

To Reproduce

Codesandbox URL

https://codesandbox.io/p/sandbox/intl-messageformat-constructor-bug-y37dvk

Reproducible Steps/Repo

Steps to reproduce the behavior:

1. Go to https://codesandbox.io/p/sandbox/intl-messageformat-constructor-bug-y37dvk
2. See the alert pop up with the error message

Expected behavior

The string constructor is alerted.

Screenshots

None

Desktop (please complete the following information):

• OS: Ubuntu 24.04
• Browser: chrome
• Version: 126

Smartphone (please complete the following information):

Didn't test but doesn't really matter.

Additional context

No additional context, but on how to resolve this issue: I think it should be ok to just use Object.create(null) for objects that hold user-provided keys, but maybe maps can be used too.