`Omit` breaks intersection with an object type with `[key: string]: unknown`

[kohver]

Bug Report

⏯ Playground Link

Playground link with relevant code

💻 Code

type ModalProps = {
  excludedProp: () => void;
  someProp: () => void;
  [key: string]: unknown;
}
function Component(props: Omit<ModalProps, "excludedProp">) {
  console.log(props.excludedProp()); // Object is type of 'unknown'. This is ok.
  console.log(props.someProp()) // Object is type of 'unknown'. This is unexpected.
}

Workaround:

type ModalProps = {
  excludedProp: () => void;
  someProp: () => void;
  [key: string]: unknown;
}
declare var { excludedProp, ...Omit_ModalProps_excludedProp }: ModalProps;
function Component(props: typeof Omit_ModalProps_excludedProp) {
  console.log(props.excludedProp()); // Object is type of 'unknown'
  console.log(props.someProp()); // works!
}

Also, this works:

type ModalProps = {
  excludedProp: () => void;
  someProp: () => void;
}
function Component(props: Omit<ModalProps, "excludedProp">) {
  console.log(props.excludedProp()); // Object is type of 'unknown'
  console.log(props.someProp()) // works!
}

type ModalProps = {
  someProp: () => void;
  [key: string]: unknown;
}
function Component(props: ModalProps) {
  console.log(props.someProp()) // works!
}

🙁 Actual behavior

In the first example the props.someProp is unknown.

🙂 Expected behavior

In the first example the props.someProp is () => void.

[MartinJohns]

See #43478 and many others.

[kohver]

Thank you for the link. Closing the issue