How to declare a type from an object literal in typescript?

Question

I have an object:

const foo = { bar: 123, baz: "lorem" };

I would like top obtain the type of this object automatically:

type Foo = { bar: number, baz: string };

How can I do this?

Answer 1

You can use keyof and typeof to construct the Foo

type Foo = { [P in keyof typeof foo]: typeof foo[P] }