Regex unicode property autocomplete

🔍 Search Terms

regular expressions, unicode character class, unicode property, hints, autocomplete

✅ 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

Since TS now validates regular expressions including unicode properties and even provides spelling suggestions, why not autocomplete them?

📃 Motivating Example

In this example TS 5.5 understands that the first regex is incorrect:

const re1 = /\p{Emoj}/u // Error: Unknown Unicode property name or value. Did you mean "Emoji"?
const re2 = /\p{Emoji}/u // Ok

💻 Use Cases

It would be convenient if TS suggested available unicode properties when suggestions are triggered inside \p{}/\P{} sequences.

No file or test is named. Start by tracing TypeScript's existing regular-expression Unicode-property validation and spelling-suggestion paths, then find where completion requests inside \p{} and \P{} are handled. Done means valid Unicode properties are offered as completions without changing emitted JavaScript, with focused tests for both forms.