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Incorrect error when assigning to omitted and extended record type #27883
Description
TypeScript Version:
typescript@3.2.0-dev.20181011
typescript@3.1.3
typescript@3.0.3
Search Terms:
Code
type Baa = { a: number, b: number };
type Omit<T, K> = Pick<T, Exclude<keyof T, K>>;
function foo<P extends Baa>() {
const foo: { foo: string } & Omit<P, 'b'> = null as any;
const props: Baa = foo;
}Expected behavior:
No error.
Actual behavior:
test.ts:6:11 - error TS2322: Type '{ foo: string; } & Pick<P, Exclude<keyof P, "b">>' is not assignable to type 'Baa'.
Property 'a' is missing in type '{ foo: string; } & Pick<P, Exclude<keyof P, "b">>'.
6 const props: Baa = foo;
~~~~~
Removing the { foo: string } & works.
Removing the Omit works.
Removing the P and using Baa directly works.
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Activity
[-]Incorrect error when assigning to omited and extended record type[/-][+]Incorrect error when assigning to omitted and extended record type[/+]ahejlsberg commentedon Feb 1, 2019
Fixed by #29121.