Invalid type after destructuring a Record

[lcswillems]

🔎 Search Terms

record destructuring concat

🕗 Version & Regression Information

TypeScript 5.2

⏯ Playground Link

https://www.typescriptlang.org/play?ssl=5&ssc=1&pln=5&pc=57#code/MYewdgzgLgBAhgLhgJQKagE4BMA80MCWYA5gDTxgCeAfDALwwDe8SATOQEZIDMMAvgG4AUKEiwO9JjAB0suOQBebfsJHhoMSkjSZc+ImQo1JzRDHYwuMXoLViYCyQHkOAK3RRpcCBALEwABQu7sCe3r7+AYx85JQAlOTMSub8cQJAA

💻 Code

const a: Record<string, any> = { a: 2, b: 3 };
const b = { ...a, z: 2 };

const y: Record<string, any> = { a: 2, b: 3 };
const z = Object.assign(Object.assign({}, y), { z: 2 });

🙁 Actual behavior

b is of type { z: number}

🙂 Expected behavior

b should be of type:

Record<string, any> & {
    z: number;
}

Same as the type of z

Additional information about the issue

No response

[fatcerberus]

Duplicate of #27273. Also this is a spread, not a destructuring.

[fatcerberus]

Note that it’s not actually an “invalid type” - { z: number } is a valid description of what you get, just not the most convenient.

[typescript-bot]

This issue has been marked as "Duplicate" and has seen no recent activity. It has been automatically closed for house-keeping purposes.