Mark ~module~ `namespace` as deprecated via LS strikethrough

[RyanCavanaugh]

🔍 Search Terms

module strikethrough namespace internal deprecate

✅ Viability Checklist

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
• This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
• This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

⭐ Suggestion

See #51825 (comment)

📃 Motivating Example

module notcool { }

💻 Use Cases

1. What do you want to use this for? Soft-deprecate internal module
2. What shortcomings exist with current approaches? Too breaky
3. What workarounds are you using in the meantime? Being sad