Utility Type - PartialRecord

[tylersayshi]

Suggestion

I believe it would be useful to have a type PartialRecord. This SO Post has had 13k+ views so I believe this is a commonly desired type.

🔍 Search Terms

PartialRecord, Partial Record

✅ Viability Checklist

My suggestion meets these guidelines:

• 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 feature would agree with the rest of TypeScript's Design Goals.

⭐ Suggestion

New Utility Type: PartialRecord

type PartialRecord<K extends keyof any, T> =  Partial<Record<K, T>>;

or

type PartialRecord<K extends keyof any, T> = {
  [P in K]?: T;
};

(from SO Post linked above)

📃 Motivating Example

This improves the basic support of Typescripts Utility types by adding support for a commonly desired pattern.

💻 Use Cases

I want to use this for conveniently defining Partial Record types without needing to maintain and import one in each project I need this pattern.

Current workaround is to define your own, but this is obviously not ideal.

[MartinJohns]

See #39522 (comment):

We've opted to not include utility type aliases in the lib unless they're required for declaration emit purposes.